Why can't I set the bounds rectangle width of an UIImageVies?

Question

When I try this

myUIImageView.bounds.size.width = 50.0f;

then I get an error: invalid lvalue in assignment

But when I do this, it compiles. Although it's a lot of extra-work

CGRect newRect = myUIImageView.bounds;
newRect.size.width = 50.0f;
myUIImageView.bounds = newRect;

Although that compiles, nothing will happen. My UIImageView's frame is 300 wide and filled with an image that is exactly 300px width. It fits perfectly. So now I wanted to stretch that image (just for fun), so I would have to make the bounds rectangle smaller in width. Lets say 50.0. But unfortunately, the image does not get stratched like expected. Just nothing happens. Two lines below this code, I move the image around. That works.

Answer 1

properties size and orign are readonly.

bounds is not readonly.

Let is why you can change bounds, but can't change size

Answer 2

This works (for me);

CGRect frame = myUIImageView.frame;
frame.size.width = 50.0;
myUIImageView.frame = frame;

Try that..

Answer 3

-[UIView bounds] returns a new CGRect containing the x, y, width and height values of the view's bounds. Changing the values on this new CGRect would have no effect and GCC realizes this.

In order to change the width you have to get the bounds from the view, store them somewhere, change the width value on the stored CGRect and inform the view of its new bounds using -[UIView setBounds:]