我试图在纯粹的
Swift中实现AV Player的观察者.
我收到错误：收到信息但未处理.是因为我使用的观察者的构造函数中的对象参数是否为零？
我把我的示例代码放在下面
谢谢
player.addobserver(self,forKeyPath: "status",options:NSkeyvalueObservingOptions(),context: nil)
player.addobserver(self,forKeyPath: "playbackBufferEmpty",forKeyPath: "playbackLikelyToKeepUp",forKeyPath: "loadedTimeRanges",options: NSkeyvalueObservingOptions(),context: nil)
private func deallocObservers(player: AVPlayer) {
player.removeObserver(self,forKeyPath: "status")
player.removeObserver(self,forKeyPath: "playbackBufferEmpty")
player.removeObserver(self,forKeyPath: "playbackLikelyToKeepUp")
}
//observer for av play
override func observeValueForKeyPath(keyPath: String,ofObject object: AnyObject,change: [NSObject : AnyObject],context: UnsafeMutablePointer<Void>) {
if keyPath == "status" {
println("Change at keyPath = \(keyPath) for \(object)")
}
if keyPath == "playbackBufferEmpty" {
showAlert("No internet connection!",message: "Mixmatic requires an internet connection to continue streaming.")
println("Change at keyPath = \(keyPath) for \(object)")
}
if keyPath == "playbackLikelyToKeepUp" {
println("Change at keyPath = \(keyPath) for \(object)")
}
}
解决方法
通常,当注册的观察者解除分配并且之后触发KVO事件时,会发生此问题.为了修复你需要删除所有的观察者,在你的对象将被释放之前.
在您的情况下,您注册了4个KVO更改并仅删除了3个.以下KVO观察器在任何地方都不会被删除,并导致问题.
player.addobserver(self,context: nil)
更改您的deallocObservers：方法如下：
private func deallocObservers(player: AVPlayer) {
player.removeObserver(self,forKeyPath: "playbackLikelyToKeepUp")
player.removeObserver(self,forKeyPath: "loadedTimeRanges")
}