iOS Core Animation: CALayer bringSublayerToFront?

Question

How do I bring a CALayer sublayer to the front of all sublayers, analogous to -[UIView bringSubviewToFront]?

Answer 1

Create a category of CALayer like this:

@interface CALayer (Utils)

- (void)bringSublayerToFront;

@end

@implementation CALayer (Utils)

- (void)bringSublayerToFront {
    CGFloat maxZPosition = 0;  // The higher the value, the closer it is to the front. By default is 0.
    for (CALayer *layer in self.superlayer.sublayers) {
        maxZPosition = (layer.zPosition > maxZPosition) ? layer.zPosition : maxZPosition;
    }
    self.zPosition = maxZPosition + 1;
}

@end