I have a problem with my UIScrollView and I hope some of you can help me in some way.
I explain you ...
At the center of my ViewController I have a ScrollView showing the contents of 3 external UIViewController. Through classic for loops I am able to properly display the contents and so far I have not found any problems ...
The problem arises when I perform scrolling between the view controller (horizontally) or, the content of each view controller moves, it does not remain as it was initially set. Now I can not figure out if the problem depends ScrollView or by content, but I think it is a problem of content viewcontroller because I used the autolayout to set constraints ...
At this point I think it's a problem that arises in the ScrollView when I make scrolling to show the next viewcontroller.
Below I insert the screen shoots to show my situation .. as you can see the contents are moved to the right and do not remain in the X position zero.
Can you help me figure out where I'm wrong? what code and 'wrong ..
ScreenShoot
code used
-(void)initializeViewControllerTour {
/* Inserisce in una NSMutableArray i ViewController inizializzati da utilizzare*/
_a_TourVC = [[UPATour alloc] init];
_a_TourVC = [self.storyboard instantiateViewControllerWithIdentifier:#"A_Tour_App"];
_b_TourVC = [[UPBTour alloc] init];
_b_TourVC = [self.storyboard instantiateViewControllerWithIdentifier:#"B_Tour_App"];
_c_TourVC = [[UPCTour alloc] init];
_c_TourVC = [self.storyboard instantiateViewControllerWithIdentifier:#"C_Tour_App"];
_containerArrayVC = [[NSMutableArray alloc] init];
[_containerArrayVC addObject:_a_TourVC];
[_containerArrayVC addObject:_b_TourVC];
[_containerArrayVC addObject:_c_TourVC];
NSInteger index = 0;
/* Imposta i valori per la ScrollView */
CGSize scrollViewSize = CGSizeMake([_containerArrayVC count] * _scrollView.frame.size.width, _scrollView.frame.size.height);
_scrollView.contentSize = scrollViewSize;
_scrollView.scrollEnabled = YES;
_scrollView.showsVerticalScrollIndicator = NO;
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.pagingEnabled = YES;
_scrollView.delegate = self;
/* Imposta il PageControl */
_pageControl.userInteractionEnabled = NO;
_pageControl.numberOfPages = [_containerArrayVC count];
_pageControl.currentPage = index;
/* Crea il ciclo For per i ViewController basandosi sulla MutableArray */
for (_currentViewController in _containerArrayVC) {
[self addChildViewController:_currentViewController];
CGFloat originx = (index) * _scrollView.frame.size.width;
_currentViewController.view.frame = CGRectMake(originx, 0, _scrollView.frame.size.width, _scrollView.frame.size.height);
[_scrollView addSubview:_currentViewController.view];
[_currentViewController didMoveToParentViewController:self];
index ++;
}
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat pageW = _scrollView.frame.size.width;
CGFloat segmentPage = _scrollView.contentOffset.x / pageW;
NSInteger page = lround(segmentPage);
_pageControl.currentPage = page;
}
Related
I am trying to build a screen which has 2 UIScrollViews, 1 Main Scroll View which is used as a container and to scroll vertically (this is working fine).
Inside the Main Scroll View, is a second scroll view, which is used for display different images. This needs to be scrolled horizontally so it will page to other images which will also update content details displayed in the Main Scroll View.
When attempting to get these two features to work together, the paging functionality does not work, however if it is outside the main scroll view it will work but will not scroll with the rest of the content.
The Image Scroll View is being detected in the events as well, but doesn't show any ability to scroll.
Below are my 3 functions which are performing the work.
- (void)viewDidLoad
{
[super viewDidLoad];
// Set up the Image Scroll View
ImageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0, screenWidth, homeImage)];
ImageScrollView.scrollEnabled = YES;
ImageScrollView.userInteractionEnabled=YES;
[ImageScrollView setPagingEnabled:YES];
[ImageScrollView setAlwaysBounceVertical:NO];
ImageScrollView.delegate = self;
// Set up the image array
NSArray *imagesArray = [NSArray arrayWithObjects:#"staff1big.png", #"staff2big.png", #"staff3big.png", nil];
// Create each image subview
for (int i = 0; i < [imagesArray count]; i++)
{
CGFloat xOrigin = i * ImageScrollView.frame.size.width;
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin, 0, ImageScrollView.frame.size.width, ImageScrollView.frame.size.height)];
[imageView setImage:[UIImage imageNamed:[imagesArray objectAtIndex:i]]];
[ImageScrollView addSubview:imageView];
}
// Set the Content Size and Offset
[ImageScrollView setContentSize:CGSizeMake(ImageScrollView.frame.size.width * [imagesArray count], ImageScrollView.frame.size.height)];
[ImageScrollView setContentOffset:CGPointMake(screenWidth*currentIndex, 0)];
// Get the staff object
dataSource = [DataSource dataSource];
NSArray *staffArray = [dataSource getStaff];
// Setup the Pager Control
self.pageControl = [[UIPageControl alloc] init];
NSInteger placement = (screenWidth/2)-50;
self.pageControl.frame = CGRectMake(placement, homeImage-30, 100, 20);
self.pageControl.numberOfPages = [staffArray count];
self.pageControl.currentPage = currentIndex;
[self setStaff:staffArray[currentIndex]];
// Add the Main Scroll View
MainScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight)];
MainScrollView.delegate = self;
MainScrollView.scrollEnabled = YES;
MainScrollView.userInteractionEnabled=YES;
// Add each object to the correct scroll view
[ImageScrollView addSubview:self.pageControl];
[MainScrollView addSubview:ImageScrollView];
[MainScrollView addSubview:lineView];
[self setDisplayContent]; // note the MainScrollView is added to the self.view in this method along with setting the content size to screenWidth and height is determine by the generated content.
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat pageWidth = ImageScrollView.frame.size.width;
float fractionalPage = ImageScrollView.contentOffset.x / pageWidth;
NSInteger page = lround(fractionalPage);
currentIndex = page;
self.pageControl.currentPage = page;
[self displayContent];
}
- (void)displayContent
{
int i = currentIndex;
if (i < 0)
{
i = 0;
} else if (i > 2) {
i = 2;
}
[self setStaff:allStaff[i]];
// remove all from view
for(UIView *subview in [MainScrollView subviews]) {
[subview removeFromSuperview];
}
NSArray *imagesArray = [NSArray arrayWithObjects:#"staff1big.png", #"staff2big.png", #"staff3big.png", nil];
for (int i = 0; i < [imagesArray count]; i++)
{
CGFloat xOrigin = i * ImageScrollView.frame.size.width;
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin, 0, ImageScrollView.frame.size.width, ImageScrollView.frame.size.height)];
[imageView setImage:[UIImage imageNamed:[imagesArray objectAtIndex:i]]];
[ImageScrollView addSubview:imageView];
}
[ImageScrollView setContentSize:CGSizeMake(ImageScrollView.frame.size.width * [imagesArray count], ImageScrollView.frame.size.height)];
[ImageScrollView setContentOffset:CGPointMake(screenWidth*currentIndex, 0)];
// Get the staff
dataSource = [DataSource dataSource];
NSArray *staffArray = [dataSource getStaff];
self.pageControl = [[UIPageControl alloc] init];
NSInteger placement = (screenWidth/2) - 50;
self.pageControl.frame = CGRectMake(placement, homeImage-30, 100, 20);
self.pageControl.numberOfPages = [staffArray count];
self.pageControl.currentPage = currentIndex;
[self setStaff:staffArray[currentIndex]];
[ImageScrollView addSubview:self.pageControl];
[MainScrollView addSubview:ImageScrollView];
[MainScrollView addSubview:lineView];
[self setDisplayContent];
}
I do need to refactor some of the code to make more efficient, but at this stage I am just trying to get the horizontal paging to scroll horizontally.
If anyone would possibly be able to help point me in the right direction as to how to fix this issue, it would be greatly appreciated.
Here is a visual of the UI that I am trying to keep but have the image scroll horizontal.
Staff Display
Using UIControlpage in my application. load the image and display in page control successfully. but i want to display the images animation like right to left move. Using timer call page control and increase the array count.
//// using NSTimer to call function to show the animation.
[NSTimer scheduledTimerWithTimeInterval:5.0
target:self
selector:#selector(loadNextController)
userInfo:nil
repeats:YES];
ScrollViewPage = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 20, frameX, frameY)];
ScrollViewPage.pagingEnabled = YES;
ScrollViewPage.backgroundColor=[UIColor redColor];
ScrollViewPage.delegate = self;
ScrollViewPage.backgroundColor = [UIColor clearColor];
ScrollViewPage.contentSize = CGSizeMake(frameX, frameY);
ScrollViewPage.showsHorizontalScrollIndicator = NO;
ScrollViewPage.pagingEnabled = YES;
pageControl = [[UIPageControl alloc] init];
pageControl.frame = CGRectMake(100,self.view.frame.size.height-100,self.view.frame.size.width-200,100);
pageControl.numberOfPages = [_pageImages count];
pageControl.currentPage = 0;
[self.view addSubview: ScrollViewPage];
for(int i = 0; i < [_pageImages count]; i++)
{
NSURL *url = [NSURL URLWithString:[_pageImages objectAtIndex:i]];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
UIImage *tmpImage = [UIImage imageWithData:data];
_backgroundImageView = [[UIImageView alloc] initWithImage:tmpImage];
_backgroundImageView.frame = CGRectMake(frameX * i, 0.0, frameX, frameY);
[ScrollViewPage addSubview:_backgroundImageView];
}
ScrollViewPage.contentSize = CGSizeMake(frameX*[_pageImages count], frameY);
pageControl.backgroundColor=[UIColor orangeColor];
[self.view addSubview:pageControl];
[pageControl addTarget:self action:#selector(pageTurn:) forControlEvents:UIControlEventValueChanged];
///// Here call the timer function
- (void)loadNextController
{
pageControl.currentPage = (pageControl.currentPage+1)%self.pageImages.count;
ScrollViewPage.contentOffset = CGPointMake(pageControl.currentPage * self.view.bounds.size.width, 0);
}
Here i need to show left to right move in uipagecontrol. help me..
In general you should always write what is your current result, what is the expected result and what have you tried.
I can only guess the issue you are facing is there are no animations.
The scroll view has a method setContentOffset:animated which you can use to animate the transition. Another approach is to use UIView animateWithDuration and sett the offset in the method block.
Try any or both of these...
[ScrollViewPage setContentOffset:CGPointMake(pageControl.currentPage * self.view.bounds.size.width, 0) animated:YES];
Or
[UIView animateWithDuration:0.2 animations:^{
ScrollViewPage.contentOffset = CGPointMake(pageControl.currentPage * self.view.bounds.size.width, 0);
}];
EDIT: Loop images.
To loop images you really only need 2 images on the scroll view at the time. I will show you the concept with 3 and you can try and play around with it.
NSArray *allImages;
NSInteger currentIndex = 0;
UIScrollView *scrollView;
UIImageView *imageViews[3];
- (void)begin {
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width*3.0, scrollView.frame.size.height); // always have 3 images at the time
scrollView.contentOffset = CGPointMake(scrollView.frame.size.width, 0.0); // put to center
for(int i=0; i<3; i++) {
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(scrollView.frame.size.width*i, 0.0, scrollView.frame.size.width, scrollView.frame.size.height)];
[scrollView addSubview:imageView];
imageView[i] = imageView;
}
[self layoutForIndex:currentIndex];
}
- (void)nextImage {
currentIndex++;
[self layoutForIndex:currentIndex];
scrollView.contentOffset = CGPointZero;
[scrollView setContentOffset:CGPointMake(scrollView.frame.size.width, 0.0) animated:YES]
}
- (void)layoutForIndex:(NSInteger)index {
if(allImages.count > 0) { // we need at least one image to do something
for(int i=0; i<3; i++) {
// do the circling
NSInteger imageIndex = index-1+i;
while(imageIndex < 0) imageIndex+=allImages.count;
while(imageIndex >= allImages.count) imageIndex-=allImages.count;
imageViews[i].image = imageViews[imageIndex];
}
}
}
But in general for what you are doing you do not even need a scroll view. On next you can simply add another image view next to the current one and then use the UIView animation to reposition both of the image views.
I have a UIScrollView in my storyboard that scrolls vertically. Inside of this scrollView, I have programmatically created a horizontal UIScrollView.
The vertical scrollView is called scroller. The horizontal UIScrollView is called scrollInfo. For some reason i am unable to register when the horizontal scrollInfo is being used. Any ideas on why this isn't working?
This is in my viewDidLoad:
scrollInfo = [[UIScrollView alloc] initWithFrame:CGRectMake(0,
155,self.view.frame.size.width, self.view.frame.size.height/4)];
//This will create a scrollview of device screen frame
scrollInfo.scrollEnabled = YES;
NSInteger numberOfViews = 3;
for (int i = 0; i < numberOfViews; i++) {
CGFloat xOrigin = i * self.view.frame.size.width;
UIView *awesomeView = [[UIView alloc] initWithFrame:CGRectMake(xOrigin, 0,
self.view.frame.size.width, self.view.frame.size.height/4)];
awesomeView.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5
alpha:1];
[scrollInfo addSubview:awesomeView];
}
// 3 views added horizontally to the UIScrollView by using xOrigin.
scrollInfo.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews,
self.view.frame.size.height/4);
[scroller addSubview:scrollInfo];
//Add scrollview to viewcontroller
scrollInfo.pagingEnabled = YES;
pageControl = [[UIPageControl alloc] init]; //SET a property of UIPageControl
pageControl.frame = CGRectMake(0,200,self.view.frame.size.width,
self.view.frame.size.height/8);
pageControl.numberOfPages = 3; //as we added 3 diff views
pageControl.currentPage = 0;
[scroller addSubview:pageControl];
Here is my scrollViewDidScroll method:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if ([mainTableView isEqual: scrollView]) {
if (mainTableView.contentOffset.y > 0) {
// yourTableView is not on top.
NSLog(#"not top");
}
else {
// yourTableView is already on top.
NSLog(#"is top");
[UIView animateWithDuration:0.5f delay:0
options:UIViewAnimationOptionCurveLinear animations:^{
scroller.contentOffset = CGPointMake(0, 0);
} completion:NULL];
}
}
else {
CGFloat pageWidth = self.view.frame.size.width;
int page = floor((scrollInfo.contentOffset.x - pageWidth / 2 ) / pageWidth) +
1; //this provide you the page number
pageControl.currentPage = page;// this displays the white dot as current page
NSLog(#"page");
}
}
Looks like you forget to connect UIScrollViewDelegate to your scrollviews. After doing this you better operate with scrollview.tag to recognize which scrollview calling delegate
I'm loading images on the UIImageView through a string and i want horizontal scrolling to view the images on a UIImageView.
In my xib file I have a scroll view over which there is a image view. I'm using this code but my page is not scrolling and only the first image in the string is loaded.Can anyone please help.
Code:
-(void)viewDidLoad
{
count=1;
// imagesName = [[NSMutableArray alloc]initWithObjects :#"election_band_base.jpg", #"ElectionBoxAPPA-Hindi(1).jpg", #"photos.png", #"business.png", #"health.png", nil];
imagesName1 = [NSString stringWithFormat :#"election_band_base.jpg", #"ElectionBoxAPPA-Hindi(1).jpg", #"photos.png", #"business.png", #"health.png", nil];
[imagesName addObject:imagesName1];
items = [[NSMutableArray alloc]init];
// [_imageView1.image setImage=imagesName1];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// _imageView1.image=[UIImage animatedImageWithImages:imagesName duration:0];
_imageView1.image=[UIImage imageNamed:imagesName1 ];
[self loadScrollView];
}
-(void)loadScrollView
{
scrollView.contentSize = CGSizeMake(0, scrollView.frame.size.height);
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < [imagesName count]; i++) {
[controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;
count=1;
// a page is the width of the scroll view
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [imagesName count], scrollView.frame.size.height);
//scrollView.contentSize = CGSizeMake(900,80);
scrollView.showsHorizontalScrollIndicator =YES;
scrollView.showsVerticalScrollIndicator = YES;
scrollView.scrollsToTop = NO;
scrollView.delegate = self;
pageControl.numberOfPages = [imagesName count];
pageControl.currentPage = 0;
// pages are created on demand
// load the visible page
// load the page on either side to avoid flashes when the user starts scrolling
[self loadScrollViewWithPage:0];
[self loadScrollViewWithPage:1];
}
- (void)loadScrollViewWithPage:(int)page {
if (page < 0) return;
if (page >= [imagesName count])
return;
// replace the placeholder if necessary
controller = [viewControllers objectAtIndex:page];
if ((NSNull *)controller == [NSNull null]) {
NSString *deviceType = [UIDevice currentDevice].model;
if([deviceType isEqualToString:#"iPhone"])
{
controller = [[MyViewController alloc] initWithNibName:#"MyViewController" bundle:nil];
}
else{
controller = [[MyViewController alloc] initWithNibName:#"MyViewController_ipad" bundle:nil];
}
[controller initWithPageNumber:page];
[controller setArrData:imagesName];
[viewControllers replaceObjectAtIndex:page withObject:controller];
}
// add the controller's view to the scroll view
if (nil == controller.view.superview) {
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0;
controller.view.frame = frame;
[scrollView addSubview:controller.view];
}
}
- (void)unloadScrollViewWithPage:(int)page {
if (page < 0) return;
if (page >= [imagesName count]) return;
controller = [viewControllers objectAtIndex:page];
if ((NSNull *)controller != [NSNull null]) {
if (nil != controller.view.superview)
[controller.view removeFromSuperview];
[viewControllers replaceObjectAtIndex:page withObject:[NSNull null]];
}
}
- (void)scrollViewDidScroll:(UIScrollView *)sender {
// We don't want a "feedback loop" between the UIPageControl and the scroll delegate in
// which a scroll event generated from the user hitting the page control triggers updates from
// the delegate method. We use a boolean to disable the delegate logic when the page control is used.
if (pageControlUsed) {
// do nothing - the scroll was initiated from the page control, not the user dragging
return;
}
// Switch the indicator when more than 50% of the previous/next page is visible
CGFloat pageWidth = scrollView.frame.size.width;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
// NSLog(#"current page %d",page);
// load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
[self unloadScrollViewWithPage:page - 2];
[self loadScrollViewWithPage:page - 1];
[self loadScrollViewWithPage:page];
[self loadScrollViewWithPage:page + 1];
[self unloadScrollViewWithPage:page + 2];
count=page+1;
// A possible optimization would be to unload the views+controllers which are no longer visible
}
// At the begin of scroll dragging, reset the boolean used when scrolls originate from the UIPageControl
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollViewLoc
{
CGFloat pageWidth = scrollViewLoc.frame.size.width;
CGPoint translation = [scrollViewLoc.panGestureRecognizer translationInView:scrollViewLoc.superview];
int page = floor((scrollViewLoc.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
}
// At the end of scroll animation, reset the boolean used when scrolls originate from the UIPageControl
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
pageControlUsed = NO;
}
- (IBAction)changePage:(id)sender
{
int page = pageControl.currentPage;
// load the visible page and the page on either side of it (to avoid flashes when the user starts scrolling)
[self loadScrollViewWithPage:page - 1];
[self loadScrollViewWithPage:page];
[self loadScrollViewWithPage:page + 1];
// update the scroll view to the appropriate page
CGRect frame = scrollView.frame;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0;
[scrollView scrollRectToVisible:frame animated:YES];
// Set the boolean used when scrolls originate from the UIPageControl. See scrollViewDidScroll: above.
pageControlUsed = YES;
}
So, you want to built the gallery view:
For this implement the following steps:
Add the UIScrollView to the view of your view controller.
In viewDidLoad method: Load the name of the images in the "ImageArray". (I assume all your images have names as "img1.png", "img2.png", "img3.png", ....)
ImageArray=[[NSMutableArray alloc]init];
for (int i=0; i<19; i++) {
NSString *imgtext=[[NSString alloc]initWithFormat:#"img%d",i+1];
[ImageArray addObject:imgtext];
}
In the viewWillAppear method, add the following code:
for (int i = 0; i < ImageArray.count; i++) {
CGRect frame;
frame.origin.x = self.scrollview.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollview.frame.size;
UIView *subview = [[UIView alloc] initWithFrame:frame];
UIImage *image = [UIImage imageNamed: [NSString stringWithFormat:#"%#.png",[ImageArray objectAtIndex:i]]];
UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
[imageView setFrame:CGRectMake(0, 0, frame.size.width,frame.size.height )];
[subview addSubview:imageView];
[self.scrollview addSubview:subview];
}
self.scrollview.contentSize = CGSizeMake(self.scrollview.frame.size.width * ImageArray.count, self.scrollview.frame.size.height);
self.scrollview.contentOffset=CGPointMake (self.scrollview.frame.size.width, 0);
Hope it helps.
I have made a scroll view in my app in which I have added multiple images with horizontal scrolling. Below is the function which may help you..
- (void)makeFriendsScrollView{
int friendsCount = 10;
float xPos = 10;
for (int i = 0; i < friendsCount; i++) {
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(xPos,25 , 54, 54)];
imgView.image = [UIImage imageNamed:#"user_default.png"];
[imgView.layer setCornerRadius:27.0];
imgView.clipsToBounds = YES;
[scrollViewFriends addSubview:imgView];
xPos = xPos + 64;
}
scrollViewFriends.contentSize = CGSizeMake(friendsCount*65, 90);
[scrollViewFriends.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[scrollViewFriends.layer setBorderWidth:0.5f];
}
i simply did this in view controller check it out...and change according to your requirement..try this in viewWillAppear method
self.arraname=[NSArray arrayWithObjects:#"1.jpg",#"2.jpg",#"3.jpg", nil];
// int friendsCount = 10;
float xPos = 160;
float x1=0;
float y=60;
for (int i = 0; i < [self.arraname count]; i++)
{
x1=xPos+(260*i);
_imgView = [[UIImageView alloc] initWithFrame:CGRectMake(x1, y, 54, 54)];
_imgView.image = [UIImage imageNamed:[self.arraname objectAtIndex:i]];
[_imgView.layer setCornerRadius:27.0];
_imgView.clipsToBounds = YES;
[self.scroll addSubview:_imgView];
}
NSLog(#"%f",x1);
self.scroll.contentSize=CGSizeMake(x1+200, 0);
self.scroll.showsHorizontalScrollIndicator = YES;
self.scroll.showsVerticalScrollIndicator=NO;
self.scroll.pagingEnabled = YES;
I'm creating a "how-to"view where I show the user 5-6 pictures on how to use the app. I want it to be like a container inside the real view. Also I want it to have a transition with swipe and a page control. Something like the AppStore has on the pictures with screenshots of an app if you know what I mean?
Is there an easy way to do this? All help highly appreciated!
here a simple code, but you can customize it with loop, animation or what you want to do ;) ...
- (void)viewDidLoad
{
[super viewDidLoad];
//init scollview
scrollView = [[UIScrollView alloc] initWithFrame:myBounds];
scrollView.delegate = self;
scrollView.pagingEnabled = YES;
//Ajout des covers classiques
for (int i = 0; i < [myCovers count]; i++) {
CGRect frame;
frame.origin.x = scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = scrollView.frame.size;
//Vue 1
UIView *subview1 = [[UIView alloc] initWithFrame:frame];
[subview1 addSubview:[myCovers objectAtIndex:i]];
[scrollView addSubview:subview1];
}
//Content Size Scrollview
scrollViewBack.contentSize = CGSizeMake(scrollViewBack.frame.size.width * ([myCovers count]), scrollViewBack.frame.size.height);
[self.view addSubview:scrollViewBack];
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width*([myCovers count]), scrollView.frame.size.height);
[self.view addSubview:scrollView];
//Page Control
pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, scrollView.frame.size.height - PAGECONTROL_HEIGTH - myBaseline, scrollView.frame.size.width, PAGECONTROL_HEIGTH)];
pageControl.numberOfPages = [myCovers count];
[self.view addSubview:pageControl];
}
#pragma mark -
#pragma mark Params setting
- (void) setObjects:(NSArray *)covers {
myCovers = [[NSArray alloc] initWithArray:covers];
}
#pragma mark -
#pragma mark Scrollview delegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)sender {
CGFloat pageWidth = scrollView.frame.size.width;
NSInteger offsetLooping = 1;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + offsetLooping;
pageControl.currentPage = page % [myCovers count];
}
You can create UIImageView for the 'n' number of images you have.
Add this images on UIScrollView. Keep the size of your scrollview same as your UIImageView size.
Most important thing, enable the Paging property of UIScrollView
It should give you the look same as AppStore screen
shot screen.