Properly zooming a UIScrollView that contains many subviews

Question

I created a zoomable UIScrollView and added 100 subviews to it (tiled). The view scrolls perfectly left and right. However, I\'d like to allow zooming.

To do so I re

Answer 1

I created the view where I added everything using:

UIView *zoomableView = [[UIView alloc] init];

without setting its frame.

The problem was solved when, after adding all the subviews to it, I set its frame to something large enough to accommodate all the tiled subviews.

Answer 2

You have to return what your going to add views to scroll view as a subviews.

Ex: If you are adding image view to scroll view then write

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView 
{
return imageView object;
}

Answer 3

Exactly,

This is what Apple also is mentioning in the Scroll View Programming Guide:

Just create a view, add all subviews to this view and add the newly created view as a single subview to the scrollview...

Then in the viewForZoomingInScrollView delegate method return the object at Index 0:

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView 
{
    return [self.scrollView.subviews objectAtIndex:0];
}