swift UISwipeGestureRecognizer和UIPanGestureRecognizer同时使用

Question

    var panGesture = UIPanGestureRecognizer(target: self, action: "pan:");
    var swipeGestureLeft = UISwipeGestureRecognizer(target: self, action: "swipe:");

    swipeGestureLeft.direction = UISwipeGestureRecognizerDirection.Left;

    self.view.addGestureRecognizer(swipeGestureLeft);
    self.view.addGestureRecognizer(panGesture);

当我运行它时，只触发平移手势。如果不将平移手势添加到视图中，则滑动手势的工作方式应该如此。