Swift：Int不能轉換為'@lvalue inout _'

Question

我在UIViewController類之外聲明了上下文和鍵變量

// player item contexts
private let PlayerItemStatusContext = 0

// player item keys
private let PlayerItemStatusKey = "status"
...
if status == AVKeyValueStatus.Loaded {
                self.playerItem = AVPlayerItem(asset: asset)
                self.playerItem?.addObserver(self, forKeyPath: PlayerItemStatusKey, options: NSKeyValueObservingOptions.Initial, context: &PlayerItemStatusContext)
                //self.player = AVPlayer(playerItem: self.playerItem!)
                //self.previewView.layer = self.player

            }

addobserver行不斷拋出錯誤：'Int'不能轉換為'@lvalue inout _'我不明白，也不知道如何解決。 謝謝

Answer 1

上下文必須是var 。 您不能將let作為inout參數傳遞。