通过iOS Swift中的Pan手势扩展Uiview

Question

我想实现一个位于屏幕底部的视图，并且可以像iOS的Uber应用程序一样以锅手势扩展？Uber主屏幕向下拖动时，视图将是最小的

Answer 1

很少有第三方库可以使您的工作变得容易。这就是其中之一。lnPopupController。

否则，如果要自定义代码并编写：请拿一个视图控制器，然后在其顶部添加一个Uiview。现在添加锅手势以如下图。

func handlePan(pan : UIPanGestureRecognizer) { 
   let velocity = pan.velocityInView(self.superview).y //; print("Velocity : (velocity)")
    var location = pan.locationInView(self.superview!) //; print("Location : (location)")
    var movement = self.frame
    movement.origin.x = 0
    movement.origin.y = movement.origin.y + (velocity * 0.05) //; print("Frame.y : (movement.origin.y)")
    if pan.state == .Ended{
        print("Gesture Ended")
        panGestureEnded()
    }else if pan.state == .Began { print("Gesture Began")
        let center = self.center
        offset.y = location.y - center.y //;  print("Offset.y : (offset.y)")

    }else{ print("Gesture else")
        animator.removeBehavior(snap)
        // Apply the initial offset.
        location.x -= offset.x
        location.y -= offset.y
        //print("location.y : (location.y)")
        // Bound the item position inside the reference view.
        location.x = self.superview!.frame.width / 2
        // Apply the resulting item center.
        snap = UISnapBehavior(item: self, snapToPoint: location)
        animator.addBehavior(snap)

  }

}