UIScrollView content view's frame's size doesn't change consistently?

It seems like when I pinch to zoom on a UIScrollView, the content view's frame size changes with the zoom. If the UIScrollView's zoom is 2, then the frame size of the content view becomes (2*width, 2*height). However, when I zoom th开发者_运维百科e scroll view programmatically using -setZoomScale:animated, the content view's frame does not resize.

Does anyone know if this is normal behavior, and if so, how I can programmatically zoom while resizing the frame?

Thanks!

Yes it is a normal behavior. You need to calculate programmatically the new width and height of the scrollview. you can use

• [yourScrollView setContentSize:CGSizeMake(yourwidth,yourheight);

and to programatically set scrolling position

• [yourScrollView setContentOffset:CGPointMake(yourxpos,yourypos) animated:YES/NO];

Hope this helps.