Ios OperationQueue cancelAllOperations未将值更改为isCancelled 我已经实现了自己的“MyOperation”和“MyOperationQueue”。

MyOperation：实现

private var _executing : Bool = false

    override var isExecuting : Bool {
        get { return _executing }
        set {
            guard _executing != newValue else { return }
            willChangeValue(forKey: "isExecuting")
            _executing = newValue
            didChangeValue(forKey: "isExecuting")
        }
    }


    private var _finished : Bool = false

    override var isFinished : Bool {
        get { return _finished }
        set {
            guard _finished != newValue else { return }
            willChangeValue(forKey: "isFinished")
            _finished = newValue
            didChangeValue(forKey: "isFinished")
        }
    }


    override func finish() {
// This will call OpeationQueue delegate method once completes
        _executing = false
        _finished = true
}

    override func start() {

        if self.isCancelled {
            finish()
            return
        }
        super.start()
        _executing = true
// Do some network operation

}

 override func cancel() {
        super.cancel()
        if self.isExecuting{
            networkRequest?.cancel()
            self.finish()
        }
    }




   override func finish() {
        _executing = false
        _finished = true

}

我正在呼叫myoperationqueue.CancelAllOperations（） 这不会触发我在操作中被取消

此实现有什么问题。

显示更多相关代码。队列实例化、取消…显示更多相关代码。队列实例化、取消。。。