Issues with autolayout and 3.5" vs 4"

Question

I have setup a viewcontroller using storyboard + autolayout, however I am having some problems (re)sizing a subview correctly for 3.5"/4" display.

This is what I have setup in storyboard:

The scrollview correctly keeps its 20px space to the bottom according to the constraint. However the subviews (red), which I add in the below loop to the scrollview should have the same height as the scrollview, but they don't :(

int pageCount= 3;

self.scrollView.delegate= self;
self.scrollView.pagingEnabled= YES;
self.scrollView.scrollEnabled= YES;
self.scrollView.showsHorizontalScrollIndicator= NO;
self.scrollView.showsVerticalScrollIndicator= NO;

self.scrollView.contentSize= CGSizeMake(self.scrollView.bounds.size.width * pageCount, self.scrollView.bounds.size.height);

NSLog(@"viewcontroller frame: %@ (bounds: %@)", NSStringFromCGRect(self.view.frame), NSStringFromCGRect(self.view.bounds));
NSLog(@"scrollview frame: %@ (bounds: %@)", NSStringFromCGRect(self.scrollView.frame), NSStringFromCGRect(self.scrollView.bounds));
NSLog(@"scrollview content size%@", NSStringFromCGSize(self.scrollView.contentSize));

 for (int i= 0; i < pageCount; i++)
 {
  UIView* neutralContainer= [[UIView alloc] initWithFrame:CGRectMake(0.0 + i * self.scrollView.frame.size.width, 0.0, self.scrollView.frame.size.width, self.scrollView.frame.size.height)];
  neutralContainer.backgroundColor= [UIColor redColor];

  NSLog(@"containerview frame: %@ (bounds: %@)", NSStringFromCGRect(neutralContainer.frame), NSStringFromCGRect(neutralContainer.bounds));
  [self.scrollView addSubview:neutralContainer];

As it seems, the scrollview frame i print in console (see screenshot) remains the same, no matter if i start the 4" or the 3.5" simulator. i would expect to get different values.
Can someone explain to me what i am doing wrong?

score 0 · Answer 1 · answered Aug 13 '14 at 16:36

0

Try setting your scrollview content size.

self.scrollView.contentSize.Height = self.scrollView.frame.size.height;

Your subview is being added dynamically, and does not have to conform to its parent's constraints.

answered Aug 13 '14 at 16:36

Theopile

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score 0 · Accepted Answer · edited May 23 '17 at 12:20

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Coming across this post Storyboard UIScrollView contentSize? helped me solve the problem:
Instead of initializing the subviews for UIScrollview in the viewDidLoad method, I moved the code to viewDidLayoutSubviews and voila, the content size is correct for both 3.5" and 4", and the subviews are layed out correctly within my scrollview.

edited May 23 '17 at 12:20

Community

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answered Aug 15 '14 at 17:27

user826955

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Issues with autolayout and 3.5" vs 4"

2 Answers2