禁用CALayer隐式动画 [英] Disabling CALayer implicit animations

问题描述

下面的类试图在 CALayer 更改属性后阻止任何隐式动画的发生。

The class below is attempting to stop any implicit animations from occurring when a CALayer has a property changed.

// NoImplicitAnimations.h

#import <Foundation/Foundation.h>
#import <QuartzCore/QuartzCore.h>

@interface NoImplicitAnimations : NSObject

- (id<CAAction>) actionForLayer:(CALayer *)layer forKey:(NSString *)key;

@end



// NoImplicitAnimations.m

#import "NoImplicitAnimations.h"

@implementation NoImplicitAnimations

- (id<CAAction>) actionForLayer:(CALayer *)layer forKey:(NSString *)key {
  return (id)[NSNull null];
}

@end

我导入 NoImplicitAnimations.h 在我的Swift桥接标头中。

I import NoImplicitAnimations.h in my Objective-C to Swift bridging header.

我创建了一个全局常量 let _noImplicitAnimations = NoImplicitAnimations（）。

I create a global constant let _noImplicitAnimations = NoImplicitAnimations().

我像这样扩展 CALayer 类：

extension CALayer {
  func noImplicitAnimations () {
    delegate = _noImplicitAnimations
  }
}

现在出现了问题。创建 myLayer 之后，我立即使用 myLayer.noImplicitAnimations（）。但是，隐式动画仍在发生。

Now comes the problem. I use myLayer.noImplicitAnimations() right after I create myLayer. Yet, implicit animations are still happening.

推荐答案

没关系。这确实有效。我在错误的 CALayer 上进行了测试。我的坏人！

Nevermind. This actually does work. I was testing it on the wrong CALayer. My bad!

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