Iphone viewForZoomingInScrollView not called

Question

Change I have a controller containing uiscrollview. This scrollview contains a custom uiview having a separate class inherited from uiview. This uiview has uiimageview as a subview. No, I take "(UIView *) viewForZoomingInScrollView: (UIScrollView *) scrollView" in the main controller. But this method did not work when I scale the scrollview. What should I do for this method to be called.

UIView *DrawingPlusImageView = [[UIView alloc]initWithFrame:CGRectMake((i*IMAGEVIEW_IPAD_LAND_X+112), 0, 800, 600)]; IDDrawingView *drawView = [[IDDrawingView alloc]initWithFrame:CGRectMake(0, 0, 800, 600)]; UIImageView* imgViewLand = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 800, 600)]; [imgViewLand setImage:[UIImage imageNamed:@"noFileSelected.png"]]; [drawView setImageToDraw:imgViewLand.image]; // drawView.delegate = self; [drawView setCurrentSlidId:hmslide.strSlideID]; [DrawingPlusImageView addSubview:imgViewLand]; [DrawingPlusImageView addSubview:drawView]; [scrollViewPresentation addSubview:DrawingPlusImageView]; drawView.userInteractionEnabled = YES; - (UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView { // Return the view that we want to zoom return [self.scrollViewPresentation.subviews objectAtIndex:1];// there are slides, im zooming the second } 

Answer 1

I had the same problem. and setting the minimum and maximum zoom levels for ScrollView solved my problem ..try

 self. scrollViewPresentation.minimumZoomScale = 1.0; self. scrollViewPresentation.maximumZoomScale = 10.0; 

Answer 2

It is called only after you start to zoom. The view should be a subview of the scrollview element, contain a reference to it as a property, and return it in the delegate method:

 - (void)viewDidLoad { [super viewDidLoad]; [self.view addSubview:self.scrollView]; [self.scrollView addSubview:self.container]; [self.container addSubview:self.imageView]; } - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return self.imageView; }