如何设置UIImage边界？

Question

I am having some trouble setting the correct location of the image for a UIImageView , which I am adding as a subview to a UIButton . I start by creating the button and adding some sublayers:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setFrame:bounds];
//add gradient background
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = button.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[UIColor colorWithRed:.5 green:.5 blue:.5 alpha:1.0].CGColor, (id)[[UIColor blackColor] CGColor], nil];
[button.layer insertSublayer:gradient atIndex:0];

//set green background
CALayer *layer = [CALayer layer];
layer.frame = CGRectInset(button.bounds, 5, 5);
layer.backgroundColor = [UIColor colorWithRed:.55 green:.8 blue:.5 alpha:1.0].CGColor;
[button.layer insertSublayer:layer above:gradient];

I then use two methods to set the image. The first (which I use if no image is saved) uses an image resource that is scaled to be the right size, and is part of the app bundle. I set this with the following code:

UIImageView *v = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"profile.png"]];
[v setBounds:CGRectInset(button.bounds, 8, 8)];
[button addSubview:v];

The trouble comes from when I use an image taken through the camera, and saved to the file system. I am setting this to the background using the following code:

//path is an NSString set the the documents location of the image.
UIImageView *v = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:path]];
[v setBounds:CGRectInset(button.bounds, 8, 8)];
[v setContentMode:UIViewContentModeScaleToFill];
[button addSubview:v];

The output to the screen now shows the image way offset from where it should be:

What am I doing wrong? How do I correctly scale/fit the image in its parent view? I have tried simply setting the button image, but nothing appeared (perhaps the image was behind the sublayers?).

Answer 1

Use - setFrame method to set the frame of imageview instead of bounds

[v setFrame:CGRectInset(button.bounds, 8, 8)];

Thus the code become

UIImageView *v = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:path]];
[v setFrame:CGRectInset(button.bounds, 8, 8)];
[v setContentMode:UIViewContentModeScaleToFill];
[button addSubview:v];