At which point can I securely access the frame in a UIImageView subclass?

Question

I've subclassed an UIImageView. After

self = [super initWithImage:image]

I try to access the self.frame.origin.y value. But it is always 0.0. One moment later, in a method that gets called from the outside, the property is fully there with a nice 100.0.

I also tried to override -(id)initWithFrame:(CGRect)aRect, but the result is the same. Is that property first set correctly as soon as the view is added to some superview? I belief that I am trying to get the frame rect directly after the object has been allocated and initialized, but before it gets added to the superview. That happens one line later.

Answer 1

The frame of an object may be set at any time. If you wish to monitor for changes to the frame, override setFrame: and setBounds:

- (void)setFrame:(CGRect)frame
{
    [super setFrame:frame];
    // Your code here
}
- (void)setBounds:(CGRect)bounds
{
    [super setBounds:bounds];
    // Your code here
}

Answer 2

I can't reproduce this issue, but I'm having to interpolate a bit to guess where you are expecting the 100 to come from. Where are you setting it? This seems to work fine:

- (id)initWithImage:(UIImage*)image {
    self = [super initWithImage:image];
    if (self != nil)
    {
     CGRect frame = self.frame;
     frame.origin = CGPointMake(100.0, 100.0);
     self.frame = frame;
     NSLog(@"y=%d", self.frame.origin.y);
     NSLog(@"frame=%@", NSStringFromCGRect(self.frame));
    }
    return self;
}

Perhaps you could provide a bit larger piece of code?