I am trying to do something that should be really simple. I want to add a gradient to one of my views. I can add it to self.view, but not to viewWithGradient. Here is the code:
CAGradientLayer *gradient = [CAGradientLayer layer];
UIColor *colorFirst = [UIColor colorWithWhite:0.10 alpha:0.15];
UIColor *colorLast = [UIColor colorWithWhite:0.535 alpha:0.8];
NSArray *colors = [NSArray arrayWithObjects:(id)colorFirst.CGColor, colorLast.CGColor, nil];
gradient.colors = colors;
NSNumber *stopFirst = [NSNumber numberWithFloat:0.00];
NSNumber *stopLast = [NSNumber numberWithFloat:1.00];
NSArray *locations = [NSArray arrayWithObjects:stopFirst, stopLast, nil];
gradient.locations = locations;
gradient.frame = CGRectMake(0.0, viewWithGradient.frame.origin.y, viewWithGradient.frame.size.width, height_of_gradient);
[self.view.layer addSublayer:gradient]; // this works. I get a nice gradient at
// the bottom of the view, where I want it,
// but I need the gradient further down in
// my view hierarchy.
// [viewWithGradient.layer addSublayer:gradient]; // this doesn't. There
// is no visually noticeable change
// if this is uncommented and the
// above line is.
viewWithGradient is a small view inside my main view inside a viewController (self.view). There is only one other view over this viewWithGradient. It is a UILabel, that only takes up about one half of the area of viewWithGradient. It has a transparent background, but the label draws its text in white. I need to have the gradient be under the UILabel, not on self.view, over the UILabel.
I currently suspect that my frame/bounds may put the gradient offscreen. Does anyone see anything that I am missing? This seems like the simplest of the CALayer usages, and I have spent way too much time on it.