calayer - needsDisplayForKey/actionForKey 覆盖是否正常工作？

Question

我正在尝试将一些适用于 Objective-C 的代码转换为 Swift。我遇到的问题是 needsDisplayForKey/actionForKey 没有以相同的方式被调用。据我所知，自定义键值没有正确传递。这是我调试时得到的结果:

默认值:

(String!) event = {
  core = {
    _baseAddress = Builtin.RawPointer = 0x00feee51 "onOrderIn"
    _countAndFlags = 1073741833
    _owner = Some {
      Some = (instance_type = Builtin.RawPointer = 0x01026348 @"onOrderIn")
    }
  }
}

自定义值(传入空字符串):

(String!) event = {
  core = {
    _baseAddress = Builtin.RawPointer = 0x0b418f79
    _countAndFlags = 1073741833
    _owner = Some {
      Some = (instance_type = Builtin.RawPointer = 0x0b418f70 -> 0x006e38f0 (void *)0x006e38c8: __NSCFString)
    }
  }
}

我不确定相关代码可能是什么。我只想问 - 还有其他人能够在 Swift 中定义自定义隐式动画吗？从 Objective C 迁移时有什么需要注意的吗？

override class func needsDisplayForKey(key: String!) -> Bool{
    if key == "angleFrom" || key == "angleTo" {
        return true;
    }
    return super.needsDisplayForKey(key)
}

override func actionForKey(event: String!) -> CAAction!{
    if event == "angleFrom" || event == "angleTo" {
        return self.makeAnimationForKey(event)
    }
    return super.actionForKey(event)
}

Answer 1

我通过在变量声明前使用@NSManaged 属性(您将在 Objective-C 中使用@dynamic 属性)在 Swift 中实现此功能