I'm using AQGridview for displaying my images inside a Gridview.
Every works oké, but when I scroll down my images are resized. (see screenshots)
This is what I do in my ViewController
- (AQGridViewCell *) gridView: (AQGridView *) aGridView cellForItemAtIndex: (NSUInteger) index
{
static NSString * PlainCellIdentifier = #"PlainCellIdentifier";
AQGridViewCell * cell = nil;
ImageDemoGridViewCell * plainCell = (ImageDemoGridViewCell *)[aGridView dequeueReusableCellWithIdentifier: PlainCellIdentifier];
if ( plainCell == nil )
{
plainCell = [[ImageDemoGridViewCell alloc] initWithFrame: CGRectMake(0.0, 0.0, 75, 75)
reuseIdentifier: PlainCellIdentifier];
}
Photo *photo = [_imageNames objectAtIndex:index];
plainCell.image = [NSString stringWithFormat:#"http://sportifun2014.sanmax.be/images/albums_photos/big/%#",photo.pho_filename];
cell = plainCell;
return cell ;
}
- (CGSize) portraitGridCellSizeForGridView: (AQGridView *) aGridView
{
return ( CGSizeMake(75, 89.9) );
}
And this is my Custom Cell class
- (id) initWithFrame: (CGRect) frame reuseIdentifier: (NSString *) aReuseIdentifier
{
self = [super initWithFrame: frame reuseIdentifier: aReuseIdentifier];
if ( self == nil )
return ( nil );
_imageView = [[UIImageView alloc] initWithFrame: CGRectZero];
[self.contentView addSubview: _imageView];
return ( self );
}
- (void) setImage: (NSString *) strurl
{
[_imageView setImageWithURL:[NSURL URLWithString:strurl]
placeholderImage:[UIImage imageNamed:#"menu"]];
[self setNeedsLayout];
}
- (void) layoutSubviews
{
NSLog(#"layoutSubviews");
[super layoutSubviews];
CGSize imageSize = _imageView.image.size;
CGRect frame = _imageView.frame;
CGRect bounds = self.contentView.bounds;
if ( (imageSize.width <= bounds.size.width) &&
(imageSize.height <= bounds.size.height) )
{
return;
}
// scale it down to fit
CGFloat hRatio = bounds.size.width / imageSize.width;
CGFloat vRatio = bounds.size.height / imageSize.height;
CGFloat ratio = MAX(hRatio, vRatio);
frame.size.width = floorf(imageSize.width * ratio);
frame.size.height = floorf(imageSize.height * ratio);
frame.origin.x = floorf((bounds.size.width - frame.size.width) * 0.5);
frame.origin.y = floorf((bounds.size.height - frame.size.height) * 0.5);
_imageView.frame = frame;
}
I've set changed this:
frame.size.width = floorf(imageSize.width * ratio);
frame.size.height = floorf(imageSize.height * ratio);
to this
frame.size.width = 75;
frame.size.height = 75;
Related
I have a UIViewController and it's view hierarchy looks like this:
UIView
UIScrollView
UIImageView
I have code that positions the image view in the middle of the scroll view's frame, like so:
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
[self recenterContent:scrollView];
}
- (void)recenterContent:(UIScrollView *)scrollView {
//this centers the content when it is smaller than the scrollView's bounds
CGFloat offsetX = MAX((scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5, 0.0);
CGFloat offsetY = MAX((scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5, 0.0);
self.scrollView.contentInset = UIEdgeInsetsMake(offsetY, offsetX, 0.f, 0.f);
}
This works fine when zooming the content, but when the view controller first loads it does not center. This is because the scrollView.contentSize is always 0. So my question is - when should I call this method after the scrollView.contentSize is set? When does that get set?
I have tried in viewDidLayoutSubviews, and the bounds of the scroll view is set then, but not the content size. Is there some method that I can use where the scroll view will be guaranteed to have the content size set?
Or is there a better way to keep the image centered when it is smaller than the scroll view? What I am trying to accomplish is to have it so the image view is not at the top of the scroll view and what I am using works, except when the scroll view's content size is not set. But if there is a better way of doing this without having to adjust the contentInset, I would be fine with that too.
Update
Here is what I have currently.
It is almost working, but no matter what I try, I cannot get it to look correct when the view loads. The way it works now is that it starts out off-center because when it calls the recenterContent method, before the view is displayed the content size of the scroll view is CGSizeZero, so the calculations are wrong. But if I try to recenter the content after the view has been displayed, then there is a visible delay before it gets centered.
I am just confused as to when the contentSize of the scroll view is set if I am using AutoLayout constraints to specify the size.
Here is my code. Can anyone see anything wrong with it?
#interface MyImageViewController ()
#property (strong, nonatomic) UIScrollView *scrollView;
#property (strong, nonatomic) UIImageView *imageView;
#property (assign, nonatomic) BOOL needsZoomScale;
#end
#implementation MyImageViewController
- (void)loadView {
self.view = [[UIView alloc] init];
[self.view addSubview:self.scrollView];
[self.scrollView addSubview:self.imageView];
self.needsZoomScale = YES;
[NSLayoutConstraint activateConstraints:#[
[self.scrollView.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
[self.scrollView.topAnchor constraintEqualToAnchor:self.view.topAnchor],
[self.scrollView.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
[self.scrollView.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor],
[self.imageView.leadingAnchor constraintEqualToAnchor:self.scrollView.contentLayoutGuide.leadingAnchor],
[self.imageView.topAnchor constraintEqualToAnchor:self.scrollView.contentLayoutGuide.topAnchor],
[self.imageView.trailingAnchor constraintEqualToAnchor:self.scrollView.contentLayoutGuide.trailingAnchor],
[self.imageView.bottomAnchor constraintEqualToAnchor:self.scrollView.contentLayoutGuide.bottomAnchor]
]];
}
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(doubleTapZoom:)];
doubleTapGesture.numberOfTapsRequired = 2;
[self.imageView addGestureRecognizer:doubleTapGesture];
}
- (CGRect)zoomRectForScrollView:(UIScrollView *)scrollView withScale:(CGFloat)scale withCenter:(CGPoint)center {
CGRect zoomRect;
//the zoom rect is in the content view's coordinates. At a zoom scale of 1.0, the zoom rect would be the size
//of the scroll view's bounds. As the zoom scale decreases, so more content is visible, the size of the rect
//grows.
zoomRect.size.width = scrollView.frame.size.width / scale;
zoomRect.size.height = scrollView.frame.size.height / scale;
//choose an origin so as to get the right center
zoomRect.origin.x = center.x - (zoomRect.size.width / 2.0);
zoomRect.origin.y = center.y - (zoomRect.size.height / 2.0);
return zoomRect;
}
- (void)doubleTapZoom:(UITapGestureRecognizer *)sender {
UIView *tappedView = sender.view;
CGPoint tappedPoint = [sender locationInView:tappedView];
if (tappedPoint.x <= 0) {
tappedPoint.x = 1;
}
if (tappedPoint.y <= 0) {
tappedPoint.y = 1;
}
if (tappedPoint.x >= tappedView.bounds.size.width) {
tappedPoint.x = tappedView.bounds.size.width - 1;
}
if (tappedPoint.y >= tappedView.bounds.size.height) {
tappedPoint.y = tappedView.bounds.size.height - 1;
}
CGFloat zoomScale;
if (self.scrollView.zoomScale < 1) {
zoomScale = 1;
} else if (self.scrollView.zoomScale < self.scrollView.maximumZoomScale) {
zoomScale = self.scrollView.maximumZoomScale;
} else {
zoomScale = self.scrollView.minimumZoomScale;
}
CGRect zoomRect = [self zoomRectForScrollView:self.scrollView withScale:zoomScale withCenter:tappedPoint];
[self.scrollView zoomToRect:zoomRect animated:YES];
}
- (UIScrollView *)scrollView {
if (!self->_scrollView) {
self->_scrollView = [[UIScrollView alloc] init];
self->_scrollView.translatesAutoresizingMaskIntoConstraints = NO;
self->_scrollView.minimumZoomScale = 0.1f;
self->_scrollView.maximumZoomScale = 4.0f;
self->_scrollView.bounces = YES;
self->_scrollView.bouncesZoom = YES;
self->_scrollView.delegate = self;
self->_scrollView.backgroundColor = [UIColor blackColor];
}
return self->_scrollView;
}
- (UIImageView *)imageView {
if (!self->_imageView) {
self->_imageView = [[UIImageView alloc] init];
self->_imageView.translatesAutoresizingMaskIntoConstraints = NO;
self->_imageView.userInteractionEnabled = YES;
}
return self->_imageView;
}
- (UIImage *)image {
return self.imageView.image;
}
- (void)setImage:(UIImage *)image {
self.imageView.image = image;
self.needsZoomScale = YES;
[self updateZoomScale];
}
- (void)updateZoomScale {
if (self.needsZoomScale && self.image) {
CGSize size = self.view.bounds.size;
if (size.width == 0.0f || size.height == 0.0f) {
return;
}
UIImage *image = self.image;
CGSize imageSize = CGSizeMake(image.size.width * image.scale, image.size.height * image.scale);
if (imageSize.width > 0 && imageSize.height > 0) {
CGFloat widthScale = size.width / imageSize.width;
CGFloat heightScale = size.height / imageSize.height;
CGFloat minScale = MIN(widthScale, heightScale);
self.scrollView.minimumZoomScale = minScale;
self.scrollView.zoomScale = minScale;
self.needsZoomScale = NO;
}
}
}
- (void)viewWillLayoutSubviews {
[super viewWillLayoutSubviews];
[self updateZoomScale];
}
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
[self recenterContent:self.scrollView];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[self recenterContent:self.scrollView];
}
#pragma mark - UIScrollViewDelegate
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return self.imageView;
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
[self recenterContent:scrollView];
}
- (void)recenterContent:(UIScrollView *)scrollView {
//this centers the content when it is smaller than the scrollView's bounds
CGFloat offsetX = MAX((scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5, 0.0);
CGFloat offsetY = MAX((scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5, 0.0);
self.scrollView.contentInset = UIEdgeInsetsMake(offsetY, offsetX, 0.f, 0.f);
}
#end
The problem is that a UIImageView has an intrinsic content size of 0,0 -- so your code is initially putting the a 0x0 image view at the center of the scroll view.
I've made a few changes to the code you posted... see comments (I "wrapped" the changes in
// ---------------------------------
comment lines:
#interface MyImageViewController : UIViewController <UIScrollViewDelegate>
#end
#interface MyImageViewController ()
#property (strong, nonatomic) UIScrollView *scrollView;
#property (strong, nonatomic) UIImageView *imageView;
#property (assign, nonatomic) BOOL needsZoomScale;
#end
#implementation MyImageViewController
- (void)loadView {
self.view = [[UIView alloc] init];
[self.view addSubview:self.scrollView];
[self.scrollView addSubview:self.imageView];
self.needsZoomScale = YES;
// ---------------------------------
// respect safe area
UILayoutGuide *g = [self.view safeAreaLayoutGuide];
// saves on a little typing
UILayoutGuide *sg = [self.scrollView contentLayoutGuide];
// ---------------------------------
[NSLayoutConstraint activateConstraints:#[
[self.scrollView.leadingAnchor constraintEqualToAnchor:g.leadingAnchor],
[self.scrollView.topAnchor constraintEqualToAnchor:g.topAnchor],
[self.scrollView.trailingAnchor constraintEqualToAnchor:g.trailingAnchor],
[self.scrollView.bottomAnchor constraintEqualToAnchor:g.bottomAnchor],
[self.imageView.leadingAnchor constraintEqualToAnchor:sg.leadingAnchor],
[self.imageView.topAnchor constraintEqualToAnchor:sg.topAnchor],
[self.imageView.trailingAnchor constraintEqualToAnchor:sg.trailingAnchor],
[self.imageView.bottomAnchor constraintEqualToAnchor:sg.bottomAnchor]
]];
}
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(doubleTapZoom:)];
doubleTapGesture.numberOfTapsRequired = 2;
[self.imageView addGestureRecognizer:doubleTapGesture];
}
- (CGRect)zoomRectForScrollView:(UIScrollView *)scrollView withScale:(CGFloat)scale withCenter:(CGPoint)center {
CGRect zoomRect;
//the zoom rect is in the content view's coordinates. At a zoom scale of 1.0, the zoom rect would be the size
//of the scroll view's bounds. As the zoom scale decreases, so more content is visible, the size of the rect
//grows.
zoomRect.size.width = scrollView.frame.size.width / scale;
zoomRect.size.height = scrollView.frame.size.height / scale;
//choose an origin so as to get the right center
zoomRect.origin.x = center.x - (zoomRect.size.width / 2.0);
zoomRect.origin.y = center.y - (zoomRect.size.height / 2.0);
return zoomRect;
}
- (void)doubleTapZoom:(UITapGestureRecognizer *)sender {
UIView *tappedView = sender.view;
CGPoint tappedPoint = [sender locationInView:tappedView];
if (tappedPoint.x <= 0) {
tappedPoint.x = 1;
}
if (tappedPoint.y <= 0) {
tappedPoint.y = 1;
}
if (tappedPoint.x >= tappedView.bounds.size.width) {
tappedPoint.x = tappedView.bounds.size.width - 1;
}
if (tappedPoint.y >= tappedView.bounds.size.height) {
tappedPoint.y = tappedView.bounds.size.height - 1;
}
CGFloat zoomScale;
if (self.scrollView.zoomScale < 1) {
zoomScale = 1;
} else if (self.scrollView.zoomScale < self.scrollView.maximumZoomScale) {
zoomScale = self.scrollView.maximumZoomScale;
} else {
zoomScale = self.scrollView.minimumZoomScale;
}
CGRect zoomRect = [self zoomRectForScrollView:self.scrollView withScale:zoomScale withCenter:tappedPoint];
[self.scrollView zoomToRect:zoomRect animated:YES];
}
- (UIScrollView *)scrollView {
if (!self->_scrollView) {
self->_scrollView = [[UIScrollView alloc] init];
self->_scrollView.translatesAutoresizingMaskIntoConstraints = NO;
self->_scrollView.minimumZoomScale = 0.1f;
self->_scrollView.maximumZoomScale = 4.0f;
self->_scrollView.bounces = YES;
self->_scrollView.bouncesZoom = YES;
self->_scrollView.delegate = self;
self->_scrollView.backgroundColor = [UIColor blackColor];
}
return self->_scrollView;
}
- (UIImageView *)imageView {
if (!self->_imageView) {
self->_imageView = [[UIImageView alloc] init];
self->_imageView.translatesAutoresizingMaskIntoConstraints = NO;
self->_imageView.userInteractionEnabled = YES;
}
return self->_imageView;
}
- (UIImage *)image {
return self.imageView.image;
}
- (void)setImage:(UIImage *)image {
self.imageView.image = image;
// ---------------------------------
// set the frame here
self.imageView.frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);
// ---------------------------------
// not needed ... unless maybe changing the image while view is showing?
//self.needsZoomScale = YES;
//[self updateZoomScale];
}
- (void)updateZoomScale {
if (self.needsZoomScale && self.image) {
CGSize size = self.view.bounds.size;
if (size.width == 0.0f || size.height == 0.0f) {
return;
}
UIImage *image = self.image;
CGSize imageSize = CGSizeMake(image.size.width * image.scale, image.size.height * image.scale);
if (imageSize.width > 0 && imageSize.height > 0) {
CGFloat widthScale = size.width / imageSize.width;
CGFloat heightScale = size.height / imageSize.height;
CGFloat minScale = MIN(widthScale, heightScale);
self.scrollView.minimumZoomScale = minScale;
self.scrollView.zoomScale = minScale;
self.needsZoomScale = NO;
}
}
}
// ---------------------------------
// Don't need this
//- (void)viewWillLayoutSubviews {
// [super viewWillLayoutSubviews];
// [self updateZoomScale];
//}
// ---------------------------------
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
// ---------------------------------
// update zoom scale here
[self updateZoomScale];
// ---------------------------------
[self recenterContent:self.scrollView];
}
// ---------------------------------
// Don't need this
//- (void)viewDidAppear:(BOOL)animated {
// [super viewDidAppear:animated];
// [self recenterContent:self.scrollView];
//}
// ---------------------------------
#pragma mark - UIScrollViewDelegate
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return self.imageView;
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
[self recenterContent:scrollView];
}
- (void)recenterContent:(UIScrollView *)scrollView {
//this centers the content when it is smaller than the scrollView's bounds
CGFloat offsetX = MAX((scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5, 0.0);
CGFloat offsetY = MAX((scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5, 0.0);
self.scrollView.contentInset = UIEdgeInsetsMake(offsetY, offsetX, 0.f, 0.f);
}
#end
and here's how I call it:
MyImageViewController *vc = [MyImageViewController new];
UIImage *img = [UIImage imageNamed:#"bkg"];
if (nil == img) {
NSLog(#"Could not load image!!!!");
return;
}
[vc setImage:img];
[self.navigationController pushViewController:vc animated:YES];
Now Im developing a banner showing feature in iOS
It's a singleton which shows banner on the upper part of screen when user logs in.
It's basically a shared view with a class method showWithName...
#interface XXUserWelcomeBanner ()
{
UIImageView *logoView;
UILabel *textLabel;
CGFloat _width;
}
#end
When user calls, it creates a UIImageView and a UILabel to add on self. And animates itself onto the screen.
+ (XXUserWelcomeBanner *)shared {
static dispatch_once_t onceToken;
static XXUserWelcomeBanner *userWelcomBanner;
dispatch_once(&onceToken, ^{
userWelcomBanner = [[XXUserWelcomeBanner alloc] init];
});
return userWelcomBanner;
}
+ (void)showWithUserName:(NSString *)userID andLogo:(UIImage * _Nullable)logo {
dispatch_async(dispatch_get_main_queue(), ^{
[[self shared] createWithName:userID andLogo:logo];
});
}
So there's this other bug I just found that causes this method to be called twice and on the second time it shows only the UIImageView.
And I don't understand why that's happening.
Because the UIImageView and UILabel won't be created twice.
Here's more code.
#pragma mark - private
- (void)createWithName:(NSString *)name andLogo:(UIImage * _Nullable)logo {
self.opaque = NO;
self.alpha = 0.9;
self.backgroundColor = COLOR(0xfcfcfc);
// if (#available(iOS 13.0, *)) {
// self.backgroundColor = UIColor.secondarySystemBackgroundColor;
// }
CGSize labelSize = CGSizeZero;
if (logoView == nil) {
if (logo != nil) {
logoView = [[UIImageView alloc] initWithImage:logo];
[self addSubview:logoView];
} else {
NSString *imagePath = [XXUtility pathForResourceNamed:#"Logo" withExtension:#"png"];
UIImage *imageToAdd = [[UIImage alloc] initWithContentsOfFile:imagePath];
logoView = [[UIImageView alloc] initWithImage:imageToAdd];
[self addSubview:logoView];
}
}
if (textLabel == nil) {
textLabel = [[UILabel alloc] init];
NSString * labelString = [NSString stringWithFormat:NSLocalizedStringWithDefaultValue(#"welcom banner", #"userInterface", [XXUtility bundleForStrings], #"Dear %#, welcome into game", #"user welcome banner text"), name];
labelSize = [labelString sizeWithAttributes:#{NSFontAttributeName : textLabel.font}];
textLabel.text = labelString;
[self addSubview:textLabel];
}
NSLog(#"XXUserWelcomeBanner Label size is %f x %f", labelSize.height, labelSize.width);
[self bannerSizeWithLabelSize:labelSize];
CGFloat bannerHeight = self.frame.size.height;
CGFloat bannerWidth = self.frame.size.width;
CGFloat logoHeight = bannerHeight * 0.45;
CGFloat logoWidth = logoHeight;
CGFloat logoXPos = (bannerWidth - logoWidth - labelSize.width) / 2;
CGFloat logoYPos = (bannerHeight - logoHeight) / 2;
CGFloat labelHeight = labelSize.height;
CGFloat labelWidth = labelSize.width;
CGFloat labelXPos = logoXPos + logoWidth + 5;
CGFloat labelYPos = (bannerHeight - labelHeight) / 2;
logoView.frame = CGRectMake(logoXPos, logoYPos, logoWidth, logoHeight);
textLabel.frame = CGRectMake(labelXPos, labelYPos, labelWidth, labelHeight);
[self bannerShow];
}
- (void)bannerSizeWithLabelSize:(CGSize)lSize {
_width = 40 + lSize.width + 5;
CGFloat height = 40;
CGFloat xPosition = ScreenWidth * 1/2 - _width * 1/2;
CGFloat yPosition = - height;
self.frame = CGRectMake(xPosition, yPosition, _width, height);
}
- (void)bannerShow {
UIViewController *vc;
if ([TOP_VIEWCONTROLLER respondsToSelector:#selector(topViewController)]) {
vc = [TOP_VIEWCONTROLLER topViewController];
} else {
vc = TOP_VIEWCONTROLLER;
}
[vc.view addSubview:self];
[UIView animateWithDuration:0.6 delay:0.2 options:UIViewAnimationOptionCurveEaseOut animations:^{
CGFloat height = 40;
CGFloat xPos = ScreenWidth * 1/2 - self->_width * 1/2;
CGFloat yPos = height * 1/3 + KiPhoneXSafeAreaDValue;
self.frame = CGRectMake(xPos, yPos, self->_width, height);
} completion:^(BOOL finished) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[UIView animateWithDuration:0.6 delay:0.2 options:UIViewAnimationOptionCurveEaseIn animations:^{
CGFloat height = 40;
CGFloat xPosition = ScreenWidth * 1/2 - self->_width * 1/2;
CGFloat yPosition = - height;
self.frame = CGRectMake(xPosition, yPosition, self->_width, height);
} completion:^(BOOL finished) {
[self bannerDestroy];
self.alpha = 0;
}];
});
}];
}
- (void)bannerDestroy {
[logoView removeFromSuperview];
[textLabel removeFromSuperview];
logoView = nil;
textLabel = nil;
[self removeFromSuperview];
}
- (void)dealloc
{
//
NSLog(#"uiview dealloc");
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/
#end
Thanks in advance.
It is expected that createWithName:andLogo: is calling more than once in your app. I guess you call it with different arguments, that's why it should not be inside dispatch_once(&onceToken, ^{ });. But you can optimise XXUserWelcomeBanner's init:
- (instancetype)init {
self = [super init];
if (self) {
logoView = [[UIImageView alloc] init];
[self addSubview:logoView];
textLabel = [[UILabel alloc] init];
[self addSubview:textLabel];
}
return self;
}
In createWithName:andLogo: you will have the following:
if (logo != nil) {
logoView.image = logo;
} else {
NSString *imagePath = [XXUtility pathForResourceNamed:#"Logo" withExtension:#"png"];
UIImage *imageToAdd = [[UIImage alloc] initWithContentsOfFile:imagePath];
logoView.image = imageToAdd;
}
NSString * labelString = [NSString stringWithFormat:NSLocalizedStringWithDefaultValue(#"welcom banner", #"userInterface", [XXUtility bundleForStrings], #"Dear %#, welcome into game", #"user welcome banner text"), name];
CGSize labelSize = [labelString sizeWithAttributes:#{NSFontAttributeName : textLabel.font}];
textLabel.text = labelString;
I have a collectionView which works well in iOS 7 and now in iOS 8 is acts strangely.
when collectionView appears it only displays one cell: (it must be 2)
but after scrolling a bit the second cell appears
Im using a custom collectionViewFlowLayout. but changing to UICollectionViewFlowLayout doesn't fix the issue.
Cell Size : 657, 500
Min Spacing For Lines : 100
Min Spacing For Cells : 10
I have added left and right edge insets: (if I remove the insets it works well. but I must use insets to keep my cell at the center of view)
- (UIEdgeInsets)collectionView:(UICollectionView *)cv
layout:(UICollectionViewLayout *)cvl
insetForSectionAtIndex:(NSInteger)section {
return UIEdgeInsetsMake(0, (cv.bounds.size.width - 657) / 2.0f, 0,
(cv.bounds.size.width - 657) / 2.0f);
}
Here is my custom flow layout:
#import "CoverFlowLayout.h"
static const CGFloat kMaxDistancePercentage = 0.3f;
//static const CGFloat kMaxRotation = (CGFloat)(50.0 * (M_PI / 180.0));
static const CGFloat kMaxZoom = 0.1f;
#implementation CoverFlowLayout
- (id)init {
if ((self = [super init])) {
self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
self.minimumLineSpacing = 10000.0f; }
return self;
}
- (NSArray*)layoutAttributesForElementsInRect:(CGRect)rect {
// 1
CGRect visibleRect =
(CGRect){.origin = self.collectionView.contentOffset,
.size = self.collectionView.bounds.size};
CGFloat maxDistance =
visibleRect.size.width * kMaxDistancePercentage;
// 2
NSArray *array = [super layoutAttributesForElementsInRect:rect];
for (UICollectionViewLayoutAttributes *attributes in array) {
// 3
CGFloat distance =
CGRectGetMidX(visibleRect) - attributes.center.x;
// 4
CGFloat normalizedDistance = distance / maxDistance;
normalizedDistance = MIN(normalizedDistance, 1.0f);
normalizedDistance = MAX(normalizedDistance, -1.0f);
// 5
//CGFloat rotation = normalizedDistance * kMaxRotation;
CGFloat zoom = 1.0f + ((1.0f - ABS(normalizedDistance)) * kMaxZoom);
// 6
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0 / -1000.0;
//transform = CATransform3DRotate(transform,
// rotation, 0.0f, 1.0f, 0.0f);
transform = CATransform3DScale(transform, zoom, zoom, zoom);
attributes.transform3D = transform;
}
// 7
return array;
}
- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {
return YES;
}
- (CGPoint)targetContentOffsetForProposedContentOffset: (CGPoint)proposedContentOffset withScrollingVelocity:(CGPoint)velocity
{
// 1
CGFloat offsetAdjustment = CGFLOAT_MAX;
CGFloat horizontalCenter = proposedContentOffset.x +
(CGRectGetWidth(self.collectionView.bounds) / 2.0f);
// 2
CGRect targetRect = CGRectMake(proposedContentOffset.x,
0.0f, self.collectionView.bounds.size.width, self.collectionView.bounds.size.height);
NSArray *array =
[super layoutAttributesForElementsInRect:targetRect];
for (UICollectionViewLayoutAttributes* layoutAttributes in array)
{
// 3
CGFloat distanceFromCenter = layoutAttributes.center.x - horizontalCenter;
if (ABS(distanceFromCenter) < ABS(offsetAdjustment))
{
offsetAdjustment = distanceFromCenter;
}
}
// 4
return CGPointMake(proposedContentOffset.x + offsetAdjustment,
proposedContentOffset.y);
}
initially in overrided layoutAttributesForElementsInRect visible rect is {0,0, 1024, 768}
but [super layoutAttributesForElementsInRect:rect]; returns only one UICollectionViewCellAttribute. (it should be 2)
is any idea how can I fix this?
I don know How it can be cause of the issue but it was originated from:
NSIndexPath *visibleIndexPath = [self.collectionView indexPathForItemAtPoint:midPoint];
I want to update my pageControl to indicate which cell is at the center of screen.
I Changed my method and now it works well:
//*****updating page control*****
// get the visible rect
CGRect visibleRect = (CGRect) {.origin = self.collectionView.contentOffset,
.size = self.collectionView.bounds.size};
// get the mid point in the visible rect
CGPoint midPoint = CGPointMake(CGRectGetMidX(visibleRect), CGRectGetMidY(visibleRect));
// find indexPath of the item in that midPoint
//in iOS 8 Cause the second cell disappear
//NSIndexPath *visibleIndexPath = [self.collectionView indexPathForItemAtPoint:midPoint];
//iterating through visble cells to find the cell which contains midpoint then get get that cell indexpath
for (UICollectionViewCell *cell in [self.collectionView visibleCells]) {
if (CGRectContainsPoint(cell.frame, midPoint)) {
NSIndexPath *indexPath = [self.collectionView indexPathForCell:cell];
//update page control
self.pageControl.currentPage = indexPath.row;
//quiting loop
break;
}
}
I have the following problem, guys. I have an app that is pretty much like Apple's PhotoScroller. I want to jump from image to image by swiping the screen. I can do that, but I can't zoom the images. Here's the problem - I have an array with images. If the array has only one object inside, there's no problem with zooming. But if there are more images in the array, they acts weirdly when I try to zoom. The image is not being zoomed and it goes where it wants off the screen. Here is my code:
int pageWidth = 1024;
int pageHeight = 768;
int counter = 0;
self.view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, pageWidth, pageHeight)];
CGRect containerFrame = self.view.frame;
scrollView = [[UIScrollView alloc] initWithFrame:containerFrame];
[self.view addSubview:scrollView];
NSMutableArray *all = [[NSMutableArray alloc] init];
[all addObject:[UIImage imageNamed:#"222.jpg"]];
CGSize scrollSize = CGSizeMake(pageWidth * [all count], pageHeight);
[scrollView setContentSize:scrollSize];
for (UIImage *image in all)
{
UIImage *pageImage = [[UIImage alloc] init];
pageImage = [all objectAtIndex:counter];
CGRect scrollFrame = CGRectMake(pageWidth * counter, 0, pageWidth, pageHeight);
miniScrollView = [[UIScrollView alloc] initWithFrame:scrollFrame];
[scrollView addSubview:miniScrollView];
CGSize miniScrollSize = CGSizeMake(pageImage.size.width, pageImage.size.height);
[miniScrollView setContentSize:miniScrollSize];
UIImageView *tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, pageImage.size.width, pageImage.size.height)];
tempImageView.image = [all objectAtIndex:counter];
self.imageView = tempImageView;
miniScrollView.maximumZoomScale = 3.0;
miniScrollView.minimumZoomScale = 1.0;
miniScrollView.clipsToBounds = YES;
miniScrollView.delegate = self;
miniScrollView.showsHorizontalScrollIndicator = NO;
miniScrollView.showsVerticalScrollIndicator = NO;
miniScrollView.bouncesZoom = YES;
[miniScrollView addSubview:imageView];
counter ++;
}
[scrollView setPagingEnabled:YES];
[scrollView setScrollEnabled:YES];
}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return imageView;
}
Do you have any ideas what's wrong? Because I am trying to get this work almost 2 weeks.
I also worked on such sort of App. The first thing that you can do is to take a separate subclass of your ScrollView so that all the paging and zooming operations can be handled easily. In your scrollView Class, You can take reference from the following code snippet.
#interface PhotoScrollView : UIScrollView<UIScrollViewDelegate,UIGestureRecognizerDelegate>
{
int finalPhotoWidth;
int finalPhotoHeight;
}
// to contain image
#property (strong, nonatomic) UIImageView *imageView;
- (id)initWithFrame:(CGRect)frame andImage:(UIImage *)photo
{
self = [super initWithFrame:frame];
if (self)
{
// Initialization code
[self initializeScrollViewWithImage:photo];
//setting gesture recognizer for single tap
UITapGestureRecognizer *singleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(scrollViewSingleTapped:)];
singleTapRecognizer.delegate = self;
singleTapRecognizer.numberOfTapsRequired = 1;
[self addGestureRecognizer:singleTapRecognizer];
//setting gesture recognizer for Double tap
UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(scrollViewDoubleTapped:)];
doubleTapRecognizer.delegate = self;
doubleTapRecognizer.numberOfTapsRequired = 2;
[self addGestureRecognizer:doubleTapRecognizer];
[singleTapRecognizer requireGestureRecognizerToFail:doubleTapRecognizer];
singleTapActivated = FALSE;
self.backgroundColor = [UIColor blackColor];
self.minimumZoomScale = 1.0f;
self.maximumZoomScale = 15.0f;
self.zoomScale = 1.0f;
self.delegate = self;
}
return self;
}
//for sizing the frame by giving height and width
-(void)initializeScrollViewWithImage:(UIImage*)photo
{
finalPhotoWidth = photo.size.width;
finalPhotoHeight = photo.size.height;
//Pre-checking of frame and setting the height and width accordingly
if (finalPhotoHeight > self.frame.size.height)
{
// if photo height is bigger than frame height, re-adjust the photo height and width accordingly
finalPhotoHeight = self.frame.size.height;
finalPhotoWidth = (photo.size.width/photo.size.height) * finalPhotoHeight;
}
if (finalPhotoWidth > self.frame.size.width)
{
// if photo width is bigger than frame width, re-adjust the photo height and width accordingly
finalPhotoWidth = self.frame.size.width;
finalPhotoHeight = (photo.size.height/photo.size.width) * finalPhotoWidth;
}
if (finalPhotoHeight < self.frame.size.height && finalPhotoWidth < self.frame.size.width)
{
// if the photo is smaller than frame, increase the photo width and height accordingly
finalPhotoWidth = self.frame.size.width;
finalPhotoHeight = self.frame.size.height;
}
//initialising imageView with the thumbnail photo
self.imageView = [[UIImageView alloc] initWithImage:photo];
self.imageView.contentMode = UIViewContentModeScaleAspectFit;
//setting frame according to the modified width and height
if(!isnan(finalPhotoWidth) && !isnan(finalPhotoHeight))
{
self.imageView.frame = CGRectMake( (self.frame.size.width - finalPhotoWidth) / 2, (self.frame.size.height - finalPhotoHeight)/2, finalPhotoWidth, finalPhotoHeight);
}
// setting scrollView properties
self.contentSize = self.imageView.frame.size;
// add image view to scroll view
[self addSubview:self.imageView];
}
//to deny the simultaneous working of single and double taps
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return NO;
}
// Gesture handleer for single tap gesture
-(void)scrollViewSingleTapped:(UITapGestureRecognizer *)recognizer
{
if(!singleTapActivated)
{
//do as per requirement
singleTapActivated = TRUE;
}
else
{
//do as per requirement
singleTapActivated = FALSE;
}
}
//for zooming after double tapping
- (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer
{
//to check whether image is zoomed
if (self.zoomScale != 1.0f)
{
//if image is zoomed, then zoom out
[self setZoomScale:1.0 animated:YES];
self.imageView.frame = CGRectMake( (self.frame.size.width - finalPhotoWidth) / 2, (self.frame.size.height - finalPhotoHeight)/2, finalPhotoWidth, finalPhotoHeight);
[self.observer photoZoomStopped];
}
else
{
// get the point of image which is double tapped
CGPoint pointInView = [recognizer locationInView:self.imageView];
// Get a zoom scale that's zoomed in slightly, capped at the maximum zoom scale specified by the scroll view
CGFloat newZoomScale = self.zoomScale * 4.0f;
newZoomScale = MIN(newZoomScale, self.maximumZoomScale);
// Figure out the rect we want to zoom to, then zoom to it
CGSize scrollViewSize = self.imageView.frame.size;
CGFloat w = scrollViewSize.width / newZoomScale;
CGFloat h = scrollViewSize.height / newZoomScale;
CGFloat x = pointInView.x - (w / 2.0f);
CGFloat y = pointInView.y - (h / 2.0f);
CGRect rectToZoomTo = CGRectMake(x, y, w, h);
[self zoomToRect:rectToZoomTo animated:YES];
}
}
// To re-center the image after zooming in and zooming out
- (void)centerScrollViewContents
{
CGSize boundsSize = self.bounds.size;
CGRect contentsFrame = self.imageView.frame;
if (contentsFrame.size.width < boundsSize.width)
{
contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width) / 2.0f;
}
else
{
contentsFrame.origin.x = 0.0f;
}
if (contentsFrame.size.height < boundsSize.height)
{
contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height) / 2.0f;
}
else
{
contentsFrame.origin.y = 0.0f;
}
self.imageView.frame = contentsFrame;
}
//for zooming in and zooming out
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
if (self.zoomScale > 1.0f)
{
[self.observer photoZoomStarted];
[self centerScrollViewContents];
}
else
{
self.bouncesZoom = NO;
[self.observer photoZoomStopped];
// for zooming out by pinching
[self centerScrollViewContents];
}
// The scroll view has zoomed, so we need to re-center the contents
}
- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
Please let me know if it helps. Thanks :)
I have an ImageZoom class that subclasses UIView and is a delgate for the UIScrollView. It's pretty straight forward. The class contains a UIScrollView which contains a UIImageView. When an instance of the class is added to a view controller the image is zoomed so that it is flush with the view. There is a method that zooms in when you double tap and zooms out when repeated. Everything works great except for when I change orientation to landscape. I can't seem to figure out how to get the zoom right so that the image is now flush with the new orientation. Here is a link to file as well:
http://www.2shared.com/file/bowDjzLr/imagescroll.html
ViewController.h
#import <UIKit/UIKit.h>
#import "ImageZoom.h"
#interface ViewController : UIViewController
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic,strong) ImageZoom *imageZoom;
#property (nonatomic, strong) UIImage *image;
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.image = [UIImage imageNamed:#"1.png"];
}
-(void)viewDidAppear:(BOOL)animated
{
ImageZoom *imageZoom = [[ImageZoom alloc]initWithImage:self.image andFrame:self.view.bounds];
self.imageZoom = imageZoom;
[self.view addSubview:imageZoom];
}
-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
[self.imageZoom willAnimateToFrame:self.view.bounds];
}
#end
ImageZoom.h
#import <UIKit/UIKit.h>
#interface ImageZoom : UIView <UIScrollViewDelegate>
- (id)initWithImage:(UIImage *)image andFrame:(CGRect)frame;
-(void)willAnimateToFrame:(CGRect)frame;
#end
ImageZoom.m
#import "ImageZoom.h"
#interface ImageZoom ()
#property (nonatomic, strong) UIImage *image;
#property (nonatomic, strong) UIImageView *imageView;
#property (nonatomic, strong) UIScrollView *scrollView;
#property BOOL zoomed;
#end
#implementation ImageZoom
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
[self loadContent];
}
return self;
}
-(void)loadContent
{
self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
self.scrollView.delegate = self;
self.scrollView.contentSize = self.image.size;
[self.scrollView addSubview:self.imageView];
[self addSubview:self.scrollView];
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat scaleWidth = scrollViewFrame.size.width / self.scrollView.contentSize.width;
CGFloat scaleHeight = scrollViewFrame.size.height / self.scrollView.contentSize.height;
CGFloat minScale = MIN(scaleWidth, scaleHeight);
self.scrollView.minimumZoomScale = minScale;
self.scrollView.maximumZoomScale = 1;
self.scrollView.zoomScale = minScale;
UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(scrollViewDoubleTapped:)];
doubleTapRecognizer.numberOfTapsRequired = 2;
doubleTapRecognizer.numberOfTouchesRequired = 1;
[self.scrollView addGestureRecognizer:doubleTapRecognizer];
}
-(void)willAnimateToFrame:(CGRect)frame
{
self.scrollView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat scaleWidth = scrollViewFrame.size.width / self.scrollView.contentSize.width;
CGFloat scaleHeight = scrollViewFrame.size.height / self.scrollView.contentSize.height;
CGFloat minScale = MIN(scaleWidth, scaleHeight);
self.scrollView.minimumZoomScale = minScale;
self.scrollView.maximumZoomScale = 1;
self.scrollView.zoomScale = minScale;
CGPoint centerPoint = CGPointMake(CGRectGetMidX(self.scrollView.frame), CGRectGetMidY(self.scrollView.frame));
[self view:self.imageView setCenter:centerPoint];
}
- (void)view:(UIView*)view setCenter:(CGPoint)centerPoint
{
CGRect viewFrame = view.frame;
CGPoint scrollViewContentOffset = self.scrollView.contentOffset;
CGFloat x = centerPoint.x - viewFrame.size.width / 2.0;
CGFloat y = centerPoint.y - viewFrame.size.height / 2.0;
if(x < 0)
{
scrollViewContentOffset.x = -x;
viewFrame.origin.x = 0.0;
}
else
{
viewFrame.origin.x = x;
}
if(y < 0)
{
scrollViewContentOffset.y = -y;
viewFrame.origin.y = 0.0;
}
else
{
viewFrame.origin.y = y;
}
view.frame = viewFrame;
self.scrollView.contentOffset = scrollViewContentOffset;
self.zoomed = NO;
}
- (id)initWithImageView:(UIImageView *)imageView andFrame:(CGRect)frame
{
self.image = imageView.image;
self.imageView = imageView;
return [self initWithFrame:frame];
}
- (id)initWithImage:(UIImage *)image andFrame:(CGRect)frame
{
self.image = image;
self.imageView = [[UIImageView alloc] initWithImage:self.image];
return [self initWithFrame:frame];
}
- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
- (void)scrollViewDidZoom:(UIScrollView *)sv
{
UIView* zoomView = [sv.delegate viewForZoomingInScrollView:sv];
CGRect zoomViewFrame = zoomView.frame;
if(zoomViewFrame.size.width < sv.bounds.size.width)
{
zoomViewFrame.origin.x = (sv.bounds.size.width - zoomViewFrame.size.width) / 2.0;
}
else
{
zoomViewFrame.origin.x = 0.0;
}
if(zoomViewFrame.size.height < sv.bounds.size.height)
{
zoomViewFrame.origin.y = (sv.bounds.size.height - zoomViewFrame.size.height) / 2.0;
}
else
{
zoomViewFrame.origin.y = 0.0;
}
zoomView.frame = zoomViewFrame;
}
- (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer
{
if(self.zoomed==NO)
{
CGPoint pointInView = [recognizer locationInView:self.imageView];
CGSize scrollViewSize = self.scrollView.bounds.size;
CGFloat w = scrollViewSize.width / self.scrollView.maximumZoomScale;
CGFloat h = scrollViewSize.height / self.scrollView.maximumZoomScale;
CGFloat x = pointInView.x - (w / 2.0);
CGFloat y = pointInView.y - (h / 2.0);
CGRect rectToZoomTo = CGRectMake(x, y, w, h);
[self.scrollView zoomToRect:rectToZoomTo animated:YES];
self.zoomed = YES;
}
else if(self.zoomed == YES)
{
CGRect rectToZoomTo = CGRectMake(0, 0, self.scrollView.contentSize.width, self.scrollView.contentSize.height);
[self.scrollView zoomToRect:rectToZoomTo animated:YES];
self.zoomed = NO;
}
}
#end
It has something to do with the willAnimateToFrame method that is called when the viewController changes orientation. Any help would be greatly appreciated.
Got it working in case anyone is interested. I had to make some changes to my ImageZoom.m file:
#import "ImageZoom.h"
#interface ImageZoom ()
#property (nonatomic, strong) UIImage *image;
#property (nonatomic, strong) UIImageView *imageView;
#property (nonatomic, strong) UIScrollView *scrollView;
#property BOOL zoomed;
#end
#implementation ImageZoom
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
[self loadContentWithFrame:frame];
}
return self;
}
-(void)loadContentWithFrame:(CGRect)frame
{
self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, frame.size.width, frame.size.height)];
self.scrollView.delegate = self;
self.scrollView.contentSize = self.image.size;
self.backgroundColor = [UIColor redColor];
[self.scrollView addSubview:self.imageView];
[self addSubview:self.scrollView];
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat scaleWidth = scrollViewFrame.size.width / self.scrollView.contentSize.width;
CGFloat scaleHeight = scrollViewFrame.size.height / self.scrollView.contentSize.height;
CGFloat minScale = MIN(scaleWidth, scaleHeight);
self.scrollView.minimumZoomScale = minScale;
self.scrollView.maximumZoomScale = 1;
self.scrollView.zoomScale = minScale;
UITapGestureRecognizer *doubleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(scrollViewDoubleTapped:)];
doubleTapRecognizer.numberOfTapsRequired = 2;
doubleTapRecognizer.numberOfTouchesRequired = 1;
[self.scrollView addGestureRecognizer:doubleTapRecognizer];
self.zoomed = NO;
}
-(void)willAnimateToFrame:(CGRect)frame
{
self.frame = frame;
[self loadContentWithFrame:frame];
}
- (id)initWithImageView:(UIImageView *)imageView andFrame:(CGRect)frame
{
self.image = imageView.image;
self.imageView = imageView;
return [self initWithFrame:frame];
}
- (id)initWithImage:(UIImage *)image andFrame:(CGRect)frame
{
self.image = image;
self.imageView = [[UIImageView alloc] initWithImage:self.image];
return [self initWithFrame:frame];
}
- (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
- (void)scrollViewDidZoom:(UIScrollView *)sv
{
UIView* zoomView = [sv.delegate viewForZoomingInScrollView:sv];
CGRect zoomViewFrame = zoomView.frame;
if(zoomViewFrame.size.width < sv.bounds.size.width)
{
zoomViewFrame.origin.x = (sv.bounds.size.width - zoomViewFrame.size.width) / 2.0;
}
else
{
zoomViewFrame.origin.x = 0.0;
}
if(zoomViewFrame.size.height < sv.bounds.size.height)
{
zoomViewFrame.origin.y = (sv.bounds.size.height - zoomViewFrame.size.height) / 2.0;
}
else
{
zoomViewFrame.origin.y = 0.0;
}
zoomView.frame = zoomViewFrame;
}
- (void)scrollViewDoubleTapped:(UITapGestureRecognizer*)recognizer
{
if(self.zoomed==NO)
{
CGPoint pointInView = [recognizer locationInView:self.imageView];
CGSize scrollViewSize = self.scrollView.bounds.size;
CGFloat w = scrollViewSize.width / self.scrollView.maximumZoomScale;
CGFloat h = scrollViewSize.height / self.scrollView.maximumZoomScale;
CGFloat x = pointInView.x - (w / 2.0);
CGFloat y = pointInView.y - (h / 2.0);
CGRect rectToZoomTo = CGRectMake(x, y, w, h);
[self.scrollView zoomToRect:rectToZoomTo animated:YES];
self.zoomed = YES;
}
else if(self.zoomed == YES)
{
CGRect rectToZoomTo = CGRectMake(0, 0, self.scrollView.contentSize.width, self.scrollView.contentSize.height);
[self.scrollView zoomToRect:rectToZoomTo animated:YES];
self.zoomed = NO;
}
}
#end