i create UIDynamicAnimator and UIGravityBehavior add gravity to animator but gravity doesn't work. and there display my dropView.
-(UIDynamicAnimator *)animaotr
{
if(!_animator)
{
_animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.gameView];
}
return _animator;
}
-(UIGravityBehavior *)gravity
{
if(!_gravity)
{
_gravity = [[UIGravityBehavior alloc] init];
_gravity.magnitude = 1;
[self.animator addBehavior:_gravity];
}
return _gravity;
}
-(void)drop{
CGRect frame;
frame.origin = CGPointZero;
frame.size = DROP_SIZE;
int x = (arc4random()%(int)self.gameView.bounds.size.width) / DROP_SIZE.width;
frame.origin.x = x * DROP_SIZE.width;
UIView *dropView = [[UIView alloc] initWithFrame:frame];
dropView.backgroundColor = [self randomColor];
[self.gameView addSubview:dropView];
[self.gravity addItem:dropView];
}
The problem is this declaration:
-(UIDynamicAnimator *)animaotr {
That method doesn't match the name self.animator, so it won't be called, and thus your gravity behavior is not being added to any animator.
Related
I'm using a container for elements which I'd like for it to be blurred. In order to add rounded corners I modified the layer while for the shadow I created a second view named containerShadow and placed it below it.
It works, but not flawlessly. The shadow darkens the effect of the blur. Is there a way to perfect it?
.h
#property (strong) UIVisualEffectView *containerView;
#property (strong) UIView *containerShadowView;
.m
- (instancetype)init {
if (self = [super init]) {
self.containerShadowView = [[UIView alloc] init];
self.containerShadowView.layer.masksToBounds = NO;
self.containerShadowView.layer.shadowRadius = 80.0;
self.containerShadowView.layer.shadowColor = [[UIColor blackColor] CGColor];
self.containerShadowView.layer.shadowOffset = CGSizeZero;
self.containerShadowView.layer.shadowOpacity = 0.25;
[self addSubview:self.containerShadowView];
self.containerView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]];
self.containerView.clipsToBounds = YES;
self.containerView.layer.cornerRadius = 20.0;
[self addSubview:self.containerView];
}
return self;
}
- (void)setFrame:(CGRect)frame {
[super setFrame:frame];
// Random container frame for testing...
self.containerView.frame =
CGRectMake(20.0,
200.0,
380,
480);
self.containerShadowView.frame = self.containerView.frame;
self.containerShadowView.layer.shadowPath =
[[UIBezierPath bezierPathWithRoundedRect:self.containerShadowView.bounds cornerRadius:self.containerView.layer.cornerRadius] CGPath];
}
You can do this by masking your containerShadowView with a "cutout" that matches the containerView effect view.
So, this is how it looks - I centered the 380x480 view, and used 0.9 for the .shadowOpacity to emphasize the differences.
Your original on the left, masked version on the right:
Kinda difficult to tell what's really going on, since that could be an opaque layer, we'll add a label behind it:
and, to clarify what we're doing, let's look at it with the containerView effect view hidden:
Here's the source code I used for that - each tap anywhere will cycle through the 8 different layouts:
#import <UIKit/UIKit.h>
#interface OrigShadowView : UIView
#property (strong) UIVisualEffectView *containerView;
#property (strong) UIView *containerShadowView;
#end
#implementation OrigShadowView
- (instancetype)init {
if (self = [super init]) {
self.containerShadowView = [[UIView alloc] init];
self.containerShadowView.layer.masksToBounds = NO;
self.containerShadowView.layer.shadowRadius = 80.0;
self.containerShadowView.layer.shadowColor = [[UIColor blackColor] CGColor];
self.containerShadowView.layer.shadowOffset = CGSizeZero;
self.containerShadowView.layer.shadowOpacity = 0.9;
[self addSubview:self.containerShadowView];
self.containerView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]];
self.containerView.clipsToBounds = YES;
self.containerView.layer.cornerRadius = 20.0;
[self addSubview:self.containerView];
}
return self;
}
- (void)setFrame:(CGRect)frame {
[super setFrame:frame];
// let's center a 380 x 480 rectangle in self
CGFloat w = 380.0;
CGFloat h = 480.0;
CGRect vRect = CGRectMake((frame.size.width - w) * 0.5, (frame.size.height - h) * 0.5, w, h);
self.containerView.frame = vRect;
self.containerShadowView.frame = self.containerView.frame;
// change origin to 0,0 because the following will be relative to the subviews
vRect.origin = CGPointZero;
self.containerShadowView.layer.shadowPath =
[[UIBezierPath bezierPathWithRoundedRect:vRect cornerRadius:self.containerView.layer.cornerRadius] CGPath];
}
#end
#interface MaskShadowView : UIView
#property (strong) UIVisualEffectView *containerView;
#property (strong) UIView *containerShadowView;
#end
#implementation MaskShadowView
- (instancetype)init {
if (self = [super init]) {
self.containerShadowView = [[UIView alloc] init];
self.containerShadowView.layer.masksToBounds = NO;
self.containerShadowView.layer.shadowRadius = 80.0;
self.containerShadowView.layer.shadowColor = [[UIColor blackColor] CGColor];
self.containerShadowView.layer.shadowOffset = CGSizeZero;
self.containerShadowView.layer.shadowOpacity = 0.9;
[self addSubview:self.containerShadowView];
self.containerView = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]];
self.containerView.clipsToBounds = YES;
self.containerView.layer.cornerRadius = 20.0;
[self addSubview:self.containerView];
}
return self;
}
- (void)setFrame:(CGRect)frame {
[super setFrame:frame];
// let's center a 380 x 480 rectangle in self
CGFloat w = 380.0;
CGFloat h = 480.0;
CGRect vRect = CGRectMake((frame.size.width - w) * 0.5, (frame.size.height - h) * 0.5, w, h);
self.containerView.frame = vRect;
self.containerShadowView.frame = self.containerView.frame;
// change origin to 0,0 because the following will be relative to the subviews
vRect.origin = CGPointZero;
self.containerShadowView.layer.shadowPath =
[[UIBezierPath bezierPathWithRoundedRect:vRect cornerRadius:self.containerView.layer.cornerRadius] CGPath];
UIBezierPath *bigBez;
UIBezierPath *clipBez;
// we need a rectangle that will encompass the shadow radius
// double the shadowRadius is probably sufficient, but since it won't be seen
// and won't affect anything else, we'll make it 4x
CGRect expandedRect = CGRectInset(vRect, -self.containerShadowView.layer.shadowRadius * 4.0, -self.containerShadowView.layer.shadowRadius * 4.0);
bigBez = [UIBezierPath bezierPathWithRect:expandedRect];
// we want to "clip out" a rounded rect in the center
// which will be the same size as the visual effect view
clipBez = [UIBezierPath bezierPathWithRoundedRect:vRect cornerRadius:self.containerView.layer.cornerRadius];
[bigBez appendPath:clipBez];
bigBez.usesEvenOddFillRule = YES;
CAShapeLayer *maskLayer = [CAShapeLayer new];
maskLayer.fillRule = kCAFillRuleEvenOdd;
maskLayer.fillColor = UIColor.whiteColor.CGColor;
maskLayer.path = bigBez.CGPath;
self.containerShadowView.layer.mask = maskLayer;
}
#end
#interface BlurTestViewController : UIViewController
{
OrigShadowView *origView;
MaskShadowView *newView;
UILabel *bkgLabel;
// so we can step through on taps to see the results
NSInteger step;
UILabel *infoLabel;
}
#end
#implementation BlurTestViewController
- (void)viewDidLoad {
[super viewDidLoad];
bkgLabel = [UILabel new];
bkgLabel.textColor = UIColor.blueColor;
bkgLabel.font = [UIFont systemFontOfSize:48.0 weight:UIFontWeightBlack];
bkgLabel.textAlignment = NSTextAlignmentCenter;
bkgLabel.numberOfLines = 0;
bkgLabel.text = #"A label can contain an arbitrary amount of text, but UILabel may shrink, wrap, or truncate the text, depending on the size of the bounding rectangle and properties you set. You can control the font, text color, alignment, highlighting, and shadowing of the text in the label.";
bkgLabel.text = #"I'm using a container for elements which I'd like for it to be blurred. In order to add rounded corners I modified the layer while for the shadow I created a second view named containerShadow and placed it below it.";
origView = [OrigShadowView new];
newView = [MaskShadowView new];
[self.view addSubview:bkgLabel];
[self.view addSubview:origView];
[self.view addSubview:newView];
infoLabel = [UILabel new];
infoLabel.font = [UIFont systemFontOfSize:20.0 weight:UIFontWeightBold];
infoLabel.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:infoLabel];
step = 0;
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// let's inset the "shadow blur" views 40-points
CGRect r = CGRectInset(self.view.frame, 40.0, 40.0);
origView.frame = r;
newView.frame = r;
// let's put the background label midway down the screen
r.origin.y += r.size.height * 0.5;
r.size.height *= 0.5;
bkgLabel.frame = r;
// put the info label near the top
infoLabel.frame = CGRectMake(40.0, 80.0, r.size.width, 40.0);
[self nextStep];
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
[self nextStep];
}
- (void)nextStep {
bkgLabel.hidden = YES;
origView.hidden = YES;
newView.hidden = YES;
origView.containerView.hidden = NO;
newView.containerView.hidden = NO;
step++;
switch (step) {
case 1:
origView.hidden = NO;
infoLabel.text = #"1: Original View";
break;
case 2:
newView.hidden = NO;
infoLabel.text = #"2: Masked View";
break;
case 3:
bkgLabel.hidden = NO;
origView.hidden = NO;
infoLabel.text = #"3: Original View";
break;
case 4:
bkgLabel.hidden = NO;
newView.hidden = NO;
infoLabel.text = #"4: Masked View";
break;
case 5:
origView.hidden = NO;
origView.containerView.hidden = YES;
infoLabel.text = #"5: Original View - effect view hidden";
break;
case 6:
newView.hidden = NO;
newView.containerView.hidden = YES;
infoLabel.text = #"6: Masked View - effect view hidden";
break;
case 7:
bkgLabel.hidden = NO;
origView.hidden = NO;
origView.containerView.hidden = YES;
infoLabel.text = #"7: Original View - effect view hidden";
break;
default:
bkgLabel.hidden = NO;
newView.hidden = NO;
newView.containerView.hidden = YES;
infoLabel.text = #"8: Masked View - effect view hidden";
step = 0;
break;
}
}
#end
I am having a big mental block figuring out something I think easy. Please see this very short video: http://screencast.com/t/eaW7rbECv4Ne.
I would like to draw a rectangle in my layoutSubviews method around the whole area that covers the subviews. I currently draw yellow rect around each term as you can see in the video.
I have a StatementView. In each key tap I am creating new objectView and adding it to my StatementView like below. I add the objectViews to a containerView and try to get the origin and size of the containerView in order to draw the stroke around it. However, it always gives me 0.
How should I update containerViews bounds values after I add the subviews to it?
// Created by ilteris on 1/31/15.
// Copyright (c) 2015 ilteris. All rights reserved.
#implementation QWZStatementView
-(id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.userInteractionEnabled = NO;
self.textField = [[MyUITextField alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
self.textField.inputView = [LNNumberpad defaultLNNumberpad];
self.textField.delegate = self;
self.isNumerator = NO;
self.isDenominator = NO;
[self addSubview:self.textField];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(statementOneTextFieldChanged:) name:UITextFieldTextDidChangeNotification object:nil];
self.containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
[self addSubview:self.containerView];
self.autoresizesSubviews = YES;
self.objectsArray = [NSMutableArray arrayWithCapacity:1];
self.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
}
return self;
}
-(void)statementOneTextFieldChanged:(NSNotification *)notification {
NSLog(#"statementOneTextFieldChanged");
QWZObjectView *objectView = [[QWZObjectView alloc] initWithFrame:self.bounds];
[self.containerView addSubview:objectView];
QWZTerm* term = [QWZQuestionDetailViewController createAndReturnCoreDataTermForJSONDict:objectData];
[objectView createTerm:term];
[self.objectsArray addObject:objectView];
[self setNeedsLayout];
}
- (void)layoutSubviews {
NSLog(#"layoutSubviews StatementView");
[super layoutSubviews];
CGSize totalSize = CGSizeMake(0, 0);
for (QWZObjectView* objectView in self.objectsArray) {
CGSize textSize = objectView.bounds.size;
objectView.frame = CGRectMake(totalSize.width , totalSize.height, textSize.width , textSize.height);
totalSize.width = textSize.width + totalSize.width;
}
CGRect bounds = self.containerView.bounds;
/*
NSLog(#"self.containerView.bounds is %#", NSStringFromCGRect(self.containerView.bounds)); //always 0.
bounds.origin = CGPointMake(totalSize.width/2, self.containerView.bounds.origin.y); //adding this code didn't help at all.
CGFloat borderWidth = 2.0f;
self.bounds = CGRectInset(self.bounds, -borderWidth, -borderWidth);
self.layer.borderColor = [UIColor redColor].CGColor;
self.layer.borderWidth = borderWidth;
*/
bounds.origin = CGPointMake(totalSize.width/2, self.containerView.bounds.origin.y);
self.containerView.bounds = bounds;
}
#end
I tried to set an block on the action property, but that didn't work... any ideas? I know the UIView animation... method has a completion block, but not sure about the UIDynamicAnimations.
EDIT: adding code
[self.animator removeAllBehaviors];
UIGravityBehavior *gravityBehaviour = [[UIGravityBehavior alloc] initWithItems:#[self.onscreen]];
gravityBehaviour.gravityDirection = CGVectorMake(0, 10);
gravityBehaviour.action = ^{
if(self.onscreen.frame.origin.y > [UIScreen mainScreen].bounds.size.height)
[self.onscreen removeFromSuperview];
NSLog(#"locations is %f, height is %f", self.onscreen.frame.origin.y, [UIScreen mainScreen].bounds.size.height);
};
[self.animator addBehavior:gravityBehaviour];
UIDynamicItemBehavior *itemBehaviour = [[UIDynamicItemBehavior alloc] initWithItems:#[self.onscreen]];
[itemBehaviour addAngularVelocity:-M_PI_2 forItem:self.onscreen];
[self.animator addBehavior:itemBehaviour];
The output reflected that the view just continued to be moved even while off screen.
So I solved it by throwing one more thing in the if statement: [animator removeAllBehaviors]; that seemed to do the trick.
let dynamicBehaviour = UIDynamicItemBehavior(items: [randomWord])
weak var weakBehaviour = dynamicBehaviour
weak var weakSelf = self
dynamicBehaviour.action = {
if let currentY = weakBehaviour?.linearVelocityForItem(rndWord).y {
if currentY > CGRectGetMaxY(self.view.frame) / 2 {
weakSelf?.animator?.removeAllBehaviors()
weakSelf?.randomWord?.removeFromSuperview()
}
}
}
I have tried my best to boil this question down as simple as possible. I have a coin object in my game:
#implementation
-(CollectableCoin*)initWithLocation:(CGPoint) Location andValue: (int) val
{
self = [super initWithImageNamed:#"coin"];
[self setScale:.35];
_value = val;
_collected = false;
self.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.size];
self.physicsBody.categoryBitMask = APAColliderTypeCoin;
self.physicsBody.collisionBitMask = APAColliderTypeBall;
self.physicsBody.mass = 0.00009;
self.physicsBody.restitution = .35;
self.position = Location;
self.name = #"collectableCoin";
return self;
}
#end
I also have a shelf object:
#implementation Shelf
-(Shelf*)initWithLocation:(CGPoint) location andWidth:(NSInteger) width
{
self = [super initWithImageNamed:#"shelf"];
if(self)
{
self.size = CGSizeMake(width, HEIGHT);
self.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.size];
self.physicsBody.dynamic = false;
self.physicsBody.restitution = 0;
self.position = location;
self.name = #"shelf";
SKSpriteNode* topOfShelf;
if(width > 5)
topOfShelf = [[SKSpriteNode alloc] initWithColor:[UIColor yellowColor] size:CGSizeMake(width-2, 1)];
else
topOfShelf = [[SKSpriteNode alloc] initWithColor:[UIColor yellowColor] size:CGSizeMake(width, 1)];
topOfShelf.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:topOfShelf.size];
topOfShelf.physicsBody.restitution = 1;
topOfShelf.physicsBody.dynamic = false;
topOfShelf.position = CGPointMake(0, location.y + self.size.height/2);
NSLog([NSString stringWithFormat:#"%f", location.y + self.size.height/2]);
NSLog([NSString stringWithFormat:#"%f", location.y]);
topOfShelf.name = #"shelf";
[self addChild:topOfShelf];
}
return self;
}
#end
I create a scene like so:
-(id)initWithSizeTest:(CGSize)size
{
self.physicsWorld.gravity = CGVectorMake(0, 0);
_gameState = READYTOSTART;
self.physicsWorld.contactDelegate = self;
if (self = [super initWithSize:size])
{
self.physicsWorld.gravity = CGVectorMake(0, 0);
for(int i = 0; i < 25; i++)
{
CollectableCoin* orb = [[CollectableCoin alloc] initWithLocation:CGPointMake(i*10, self.size.height*.75) andValue:1];
[self addChild:orb];
}
Shelf* shelf = [[Shelf alloc] initWithLocation:CGPointMake(self.size.width/2, self.size.height/2) andWidth:self.size.width];
[self addChild:shelf];
}
return self;
}
Here is the touchesBegan method:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */
if(_gameState == READYTOSTART)
{
self.physicsWorld.gravity = CGVectorMake(0, -2.0);
_gameState = PLAYING;
[[self childNodeWithName:#"taptostart"] removeFromParent];
}
When the scene starts, I have a row of coins hovering above a shelf, gravity is disabled, and I have a solid 60fps. When I tap the screen, the touchesbegan function enables gravity and the coins fall on the shelf, and the frame rate drops to 5fps. The didBeginContact function is not being called because the shelf object is not dynamic nor does it have contact or collision bitmasks, so I am fairly sure that it is not being overloaded by extraneous calls to didBeginContact. This happens on an iPad mini and an iPhone 4s, but not in any of the simulators. This is a very simple example of the actual problem that I am having. Anyone have any insights?
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 :)