Is there a UIView resize event?

Question

I have a view that has rows and columns of imageviews in it.

If this view is resized, I need to rearrange the imageviews positions.

This view is a subview of

Answer 1

Pretty old but still a good question. In Apple's sample code, and in some of their private UIView subclasses, they override setBounds roughly like:

-(void)setBounds:(CGRect)newBounds {
    BOOL const isResize = !CGSizeEqualToSize(newBounds.size, self.bounds.size);
    if (isResize) [self prepareToResizeTo:newBounds.size]; // probably saves 
    [super setBounds:newBounds];
    if (isResize) [self recoverFromResizing];
}

Overriding setFrame: is NOT a good idea. frame is derived from center, bounds, and transform, so iOS will not necessarily call setFrame:.