ScrollView for images Objective C (iOS) - ios

Question

I am trying to create a welcome page for my app (with screenshots).
I have taken some samples and made it into a text scroll. I have tried for weeks without any success. Thanks
int numberOfPages = 5;
UIScrollView *someScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
someScrollView.pagingEnabled = YES;
someScrollView.contentSize = CGSizeMake(numberOfPages * someScrollView.frame.size.width, someScrollView.frame.size.height);
[self.view addSubview:someScrollView];
for (int i = 0; i < numberOfPages; i++) {
UILabel *tmpLabel = [[UILabel alloc] initWithFrame:CGRectMake(i * someScrollView.frame.size.width + 20,
20,
someScrollView.frame.size.width - 40,
20)];
tmpLabel.textAlignment = UITextAlignmentCenter;
tmpLabel.text = [NSString stringWithFormat:#"THIS ACTUALLY WORKS!! %d", i];
[someScrollView addSubview:tmpLabel];
}
Here is my failed attempt to do with images:
int numberOfPages = 5;
UIScrollView *someScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
someScrollView.pagingEnabled = YES;
someScrollView.contentSize = CGSizeMake(numberOfPages * someScrollView.frame.size.width, someScrollView.frame.size.height);
[self.view addSubview:someScrollView];
for (int i = 0; i < numberOfPages; i++) {
UIImageView *tmpLabel = [[UIImageView alloc] initWithFrame:CGRectMake(i * someScrollView.frame.size.width + 20,
20,
someScrollView.frame.size.width - 40,
20)];
tmpLabel.imageAlignment = UIImageAlignmentCenter;
tmpLabel.text = [NSString stringWithFormat:#"THIS ACTUALLY WORKS!! %d", i];
[someScrollView addSubview:tmpLabel];
}
UIImageView *imageView1 = [[UIImageView alloc]initWithFrame:subview1.frame];
if (i == 0) {
imageView1.image = [UIImage imageNamed:#"openingScreen1.png"];
}else if (i == 1){
imageView1.image = [UIImage imageNamed:#"openingScreen2.png"];
}else if (i == 2){
imageView1.image = [UIImage imageNamed:#"openingScreen3.png"];
}else {
imageView1.image = [UIImage imageNamed:#"openingScreen4.png"];
}
I also might need to remove the word "Parse" unless the images above sit on top of it? I cannot locate the word.

Answer 1

try this
UIScrollView *someScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0,
self.view.frame.size.width,
self.view.frame.size.height)];
someScrollView.pagingEnabled = YES;
[someScrollView setAlwaysBounceVertical:NO];
//setup internal views
NSInteger numberOfPages = 5;
for (int i = 0; i < numberOfPages; i++)
{
CGFloat xOrigin = i * self.view.frame.size.width+10;
UILabel *tmpLabel = [[UILabel alloc] initWithFrame:CGRectMake(xOrigin,70,self.view.frame.size.width,25)];
tmpLabel.textAlignment = NSTextAlignmentCenter;
tmpLabel.text = [NSString stringWithFormat:#"THIS ACTUALLY WORKS!! %d", i+1];
[someScrollView addSubview:tmpLabel];
// calculate the width
UIImageView *image = [[UIImageView alloc] initWithFrame:
CGRectMake(xOrigin, tmpLabel.frame.size.height + tmpLabel.frame.origin.y + 10,
self.view.frame.size.width,
self.view.frame.size.height)]; // customize your width, height and y co ordinates
image.image = [UIImage imageNamed:[NSString stringWithFormat:
#"openingScreen%d.jpg", i+1]];
image.contentMode = UIViewContentModeScaleAspectFit;
[someScrollView addSubview:image];
}
//set the scroll view content size
someScrollView.backgroundColor = [UIColor blueColor];
someScrollView.contentSize = CGSizeMake(self.view.frame.size.width *
numberOfPages,
self.view.frame.size.height);
//add the scrollview to this view
[self.view addSubview:someScrollView];
the sample OutPut is
here I attached the sample Project also, please use this

Answer 2

Please change your code to something like
int numberOfPages = 5;
UIScrollView *someScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
someScrollView.pagingEnabled = YES;
//set the scroll view delegate to self so that we can listen for changes
someScrollView.delegate = self;
someScrollView.contentSize = CGSizeMake(numberOfPages * someScrollView.frame.size.width, someScrollView.frame.size.height);
[self.view addSubview:someScrollView];
for (int i = 1; i <= numberOfPages; i++) {
//set the origin of the sub view
CGFloat myOrigin = i * self.view.frame.size.width;
//get the sub view and set the frame
UIImageView *imageView1 = [[UIImageView alloc]initWithFrame:CGRectMake(myOrigin, 0, self.view.frame.size.width, someScrollView.frame.size.height)];
imageView1.image = [UIImage imageNamed: [NSString stringWithFormat:#"openingScreen%d.png",i ]];
//add the subview to the scroll view
[someScrollView addSubview:imageView1];
}
Add scroll view Delegate methods
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
}
//dragging ends, please switch off paging to listen for this event
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *) targetContentOffset NS_AVAILABLE_IOS(5_0)
{
//find the page number you are on
CGFloat pageWidth = scrollView.frame.size.width;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
NSLog(#"Dragging - You are now on page %i",page);
}