iOS核心动画：CALayer bringSublayerToFront？ [英] iOS Core Animation: CALayer bringSublayerToFront?

问题描述

如何将 CALayer子图层带到所有子图层的前面，类似于 - [UIView bringSubviewToFront] ？

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

推荐答案

我不认为这些方法存在，但很容易推出自己的方法。

I don't think such methods exist, but it's easy to roll your own.

// CALayer+Additions.h

@interface CALayer (Additions)
- (void)bringSublayerToFront:(CALayer *)layer;
- (void)sendSublayerToBack:(CALayer *)layer;
@end

// CALayer+Additions.m

@implementation CALayer (Additions)

- (void)bringSublayerToFront:(CALayer *)layer {
    CALayer *superlayer = self.superlayer;
    [self removeFromSuperlayer];
    [superlayer insertSublayer:gradientLayer atIndex:[self.sublayers count]-1];
}

- (void)sendSublayerToBack:(CALayer *)layer {
    CALayer *superlayer = self.superlayer;
    [self removeFromSuperlayer];
    [superlayer insertSublayer:gradientLayer atIndex:0];
}

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