UIButton has gap - objective-c

Question

Making a UIButton. for some reason, it has a white gap around it (the grey area is the UIView the button is in):
code:
UIView *photoView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, (THUMBNAIL_SIZE) + (PHOTO_VIEWER_OFFSET_COLUM_1 * 2))];
photoView.backgroundColor = [UIColor lightGrayColor];
UIScrollView *myScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, photoView.frame.size.height)];
myScrollView.backgroundColor = [UIColor lightGrayColor];
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.frame = CGRectMake(0, 0, 50, 50);
myButton.titleLabel.font = [UIFont fontWithName:labelFont size:16];
[myButton setTitle:#"X" forState:UIControlStateNormal];
[myButton setBackgroundImage:[UIImage imageNamed:#"add-report.png"] forState:UIControlStateNormal];
myButton.center = CGPointMake(((photoView.frame.size.width - myScrollView.frame.size.width) / 2) + myScrollView.frame.size.width, photoView.frame.size.height / 2);
[photoView addSubview:myButton];
[self.view addSubview:photoView];
I dont' want the white buffers space there, but i can't figure out how to get rid of it.
any ideas?
EDIT: if i try to change the background color:
myButton.backgroundColor = [UIColor orangeColor];
i get this effect:

Answer 1

It might be the text label that has a white background be default?
Try setting every color to [UIColor clearColor] such as button.background and button.titleLabel.background.
Also try to modify the image view. Maybe it does not scale automatically as expected:
button.imageView.contentMode = UIViewContentModeScaleToFill;