UIScrollView SubViews won't resize

Question

Design:
View Hierarchy is as below:

• UIScrollView (for paging multiple image)
  • UIScrollView (for enabling zoom on the UIImageView)
    • UIImageView
      
      • UIView (origin,size relative to UIImage in UIImageView)
      • UIView
      • UIView ...
  • UIScrollview
    • UIImageView
      • UIView
      • UIView ...
  • UIScrollView ... and so on

Implementation:

- (id)init  
{  
self = [super init];  
if (self) {  
    // Custom initialization  
    self.minimumZoomScale = 1.0f;  
    self.maximumZoomScale = 4.0f;  
    self.zoomScale = 1.0f;  
    self.bouncesZoom = true;  
    self.bounces = true;  
    self.tag = 10;  
    self.alwaysBounceHorizontal = false;  
    self.autoresizesSubviews = YES;  

    self.zoomView = [[UIImageView alloc] init];
    self.zoomView.userInteractionEnabled = YES;
    self.zoomView.autoresizesSubviews = YES;
}

return self;
}  
- (void)displayImage:(UIImage *)image  
{    
// Set the image in the view  
[_zoomView setImage:image];  

// Set the Frame size to the size of image size  
// Ex. Resulting ScrollView frame = {0,0},{1250,1500}  
// Ex. Resulting ImageView frame = {0,0}, {1250,1500}  
CGRect scrollFrame = self.frame;  
scrollFrame.size.width = image.size.width;  
scrollFrame.size.height = image.size.height;  
self.frame = scrollFrame;  

CGRect iViewFrame = _zoomView.frame;  
iViewFrame.size.width = image.size.width;  
iViewFrame.size.height = image.size.height;  
_zoomView.frame = iViewFrame;  

// Add subviews before resetting the contentsize  
for (customClass* field in list.fields) {  

    UIView* view = [[UIView alloc] initWithFrame:CGRectMake([field.x floatValue], [field.y floatValue], [field.width floatValue], [field.height floatValue])];  
    view.backgroundColor = [UIColor redColor];  
    view.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin |UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;  

    [_zoomView addSubview:view];  
}  

// Set the Frame size to the size of scrollview frame size  
// Ex. Resulting ScrollView Frame = {0,0},{320,460}  
// Ex. Resulting ImageView Frame = {0,0},{320,460}  
CGRect scrollViewFrame = self.frame;  
scrollViewFrame.size.width = 320.0f;  
scrollViewFrame.size.height = 460.0f;  
self.frame = scrollViewFrame;  

CGRect imageViewFrame = _zoomView.frame;  
imageViewFrame.size.width = self.bounds.size.width;  
imageViewFrame.size.height = self.bounds.size.height;  
_zoomView.frame = imageViewFrame;  


self.contentSize = _zoomView.bounds.size;  

[self addSubview:_zoomView];  
}  

Above is the code that I tried implementing. It adds the UIViews to the UIImageView inside the UIScrollView. But the relative origin of the UIView is not correct (both before and after resizing).

Is there anything I should be doing differently to get the UIViews correctly placed inside the UIImageView?

Answer 1

This was top hit on Google for "scrollview subviews wont resize". For anyone else following that link:

Looking at your source, and comparing to mine, I realised that in Interface Builder, my NIB file had the tickbox for "auto size subviews" unticked. I have a vague memory this might be because in an old version of Xcode (this is an old project that's been maintained for a while) ... UIScrollView defaulted to having it switched off.

So: check that you've got it set correctly in Xcode / Interface Builder, and/or that you're setting it in code.