Stretched background image in subview - objective-c

Question

Aroundabouts the internet, I've come across the following code for stretching an image to fill a UIView:
UIGraphicsBeginImageContext(self.view.frame.size);
[[UIImage imageNamed:#"image.png"] drawInRect:self.view.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.view.backgroundColor = [UIColor colorWithPatternImage:image];
This is all well and good. But I thought I'd repurpose the code to work for a custom UIView class being used as a subview, and put the following code in initWithCoder: (since the views are being added in storyboard) as follows:
- (id)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
UIGraphicsBeginImageContext(self.frame.size);
[[UIImage imageNamed:#"image.png"] drawInRect:self.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.backgroundColor = [UIColor colorWithPatternImage:image];
}
return self;
}
Note that I've changed "self.view" to simply "self" to reflect that this code is being called by the view itself and not by a view controller. The first code sample works great, and fills the view grandly. The second doesn't (even if I put it in the view controller ala self.subView.frame.size), and I have a feeling it's because I don't properly understand frame and bounds. Can somebody give me a quick crash course, or (if I'm way off base) point out what's actually wrong?
EDIT: Now I'm really confused. Using NSLog, I've gleaned the following information:
self.view.bounds.size.width: 768
self.subView.bounds.size.width: 0
...Huh?? The same is true of frame. But... it's on there, it's got dimensions...

Answer 1

I think there might be an easier way to accomplish what you are wanting to do. If I understand you correctly, you're looking to have image.png be a background image for your custom view. If so, all you'll need to do is add a UIImageView when you initialize your custom view.
- (id) initWithCoder: (NSCoder *) coder
{
self = [super initWithCoder: coder];
if (self) {
UIImageView *imageView = [[UIImageView alloc] initWithFrame: self.bounds];
[imageView setAutoresizingMask: (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth)];
[imageView setImage: [UIImage imageNamed: #"image.png"]];
[self addSubview: imageView];
}
return self;
}