如何调整UIImageView的大小？

Question

I've a UIImageView called img .

How do I change it's size, let's say, increase it by 1.0 each time a press a button ?

Answer 1

It sounds like what you need is to adjust this size of UIImageView , not really change size of UIImage . You can assign a new frame value of this UIImageView.

CGRect newFrame = img.frame;
newFrame .size.width += 1;
newFrame .size.height += 1;
img.frame = newFrame ;

Answer 2

Simply by setting a different frame (and an appropriate content mode). For example:

- (IBAction) buttonWasPressed
{
    [imageView setFrame:CGRectInset([imageView frame], -20, -20)];
}

Note that this only changes the view size, not the underlying image data.