SWIFT-xcode 6 beta 6中的KVO. [英] SWIFT - KVO in xcode 6 beta 6.. observeValueForKeyPath no longer called

问题描述

我一直在将我的应用程序从Beta 3调试到Beta 6

I have been debugging my app from beta 3 to beta 6

我似乎无法调用observeValueForKeyPath..我在函数顶部放置了一个断点，但没有任何反应

I cannot seem to get observeValueForKeyPath to be called.. i put a breakpoint at the top of the function and nothing happens

self.gameScene.viewController.joystick.addObserver(self, forKeyPath: "relativePosition", options: .New, context: nil)

override func observeValueForKeyPath(keyPath: String!, ofObject object: AnyObject!, change: [NSObject : AnyObject]!, context: UnsafeMutablePointer<Void>) {

    if keyPath == "relativePosition" {
    // some code here 
    }
}

此代码之前运行正常..发生了什么变化?我什至无法在更基本的应用程序中使用它..还有其他需要做的事情吗?

this code was working without a hitch before.. has something changed? I can't even get this to work in a more basic app.. is there something else I need to do?

推荐答案

属性必须在其前面带有动态"一词，以便现在可以观察到.

a property has to have the word "dynamic" in front of it to be observable now..

dynamic var relativePosition: CGPoint = CGPointZero

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