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POUIScrollView Zooming Crashes App with Exc_Bad_Access
 

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    <p>I am getting a Exc_Bad_Access error in main when I try to scroll my UIScrollView. This program is simple. I have A UIViewController added in AppDelegate. Then, here is the code in the ViewController. This works fine for scrolling but as soon as I add <code>tmpScrollView.delegate = self</code>. The program won't scroll or zoom and gives me the Exc_Bad_Access error when I try to zoom.</p> <pre><code>@interface MainViewController : UIViewController &amp;ltUIScrollViewDelegate&gt; @property (nonatomic,retain) UIScrollView *tmpScrollView; @property (nonatomic,retain) UIView *containerView; @end - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. tmpScrollView = [[UIScrollView alloc] initWithFrame:self.view.frame]; tmpScrollView.delegate = self; [self.view addSubview:tmpScrollView]; // Set up the container view to hold our custom view hierarchy CGSize containerSize = CGSizeMake(640.0f, 640.0f); self.containerView = [[UIView alloc] initWithFrame:(CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=containerSize}]; [self.tmpScrollView addSubview:self.containerView]; // Set up custom view hierarchy UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 640.0f, 80.0f)]; redView.backgroundColor = [UIColor redColor]; [self.containerView addSubview:redView]; UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 560.0f, 640.0f, 80.0f)]; blueView.backgroundColor = [UIColor blueColor]; [self.containerView addSubview:blueView]; UIView *greenView = [[UIView alloc] initWithFrame:CGRectMake(160.0f, 160.0f, 320.0f, 320.0f)]; greenView.backgroundColor = [UIColor greenColor]; [self.containerView addSubview:greenView]; UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"slow.png"]]; imageView.center = CGPointMake(320.0f, 320.0f); [self.containerView addSubview:imageView]; //Tell the scroll view the size of the contents self.tmpScrollView.contentSize = containerSize; } -(void)viewWillAppear:(BOOL)animated { NSLog(@"Will Appear"); [super viewWillAppear:animated]; // Set up the minimum &amp; maximum zoom scales CGRect scrollViewFrame = self.tmpScrollView.frame; CGFloat scaleWidth = scrollViewFrame.size.width / self.tmpScrollView.contentSize.width; CGFloat scaleHeight = scrollViewFrame.size.height / self.tmpScrollView.contentSize.height; CGFloat minScale = MIN(scaleWidth, scaleHeight); self.tmpScrollView.minimumZoomScale = minScale; self.tmpScrollView.maximumZoomScale = 1.0f; self.tmpScrollView.zoomScale = minScale; //***** Here is the line for setting the delegate self.tmpScrollView.delegate = self; [self centerScrollViewContents]; } -(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale { NSLog(@"End Zoom"); } -(UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView { // Return the view that we want to zoom return self.containerView; } -(void)scrollViewDidZoom:(UIScrollView *)scrollView { // The scroll view has zoomed, so we need to re-center the contents [self centerScrollViewContents]; } @end </code></pre> <p>Thanks for any help. This has been driving me crazy for a day now...</p> <p>Edit: Adding centerScrollViewContens too:</p> <pre><code>- (void)centerScrollViewContents { CGSize boundsSize = self.tmpScrollView.bounds.size; CGRect contentsFrame = self.containerView.frame; if (contentsFrame.size.width &lt; boundsSize.width) { contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width) / 2.0f; } else { contentsFrame.origin.x = 0.0f; } if (contentsFrame.size.height &lt; boundsSize.height) { contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height) / 2.0f; } else { contentsFrame.origin.y = 0.0f; } self.containerView.frame = contentsFrame; } </code></pre>
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    1. COSome sought of mistake in first line,it should be : UIViewController <UIScrollViewDelegate>
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