ios - 在 5 个像素而不是默认的 1 个像素后触摸拖动到 UIButton 内

Question

我在 Storyboard上有一个 UIButton。 UIButton 连接到 Touch Drag Inside 操作 myTouchDragInsideAction。当用户从内部拖动按钮时触发该操作 (UIControlEventTouchDragInside)。

问题是在内部拖动 1 个像素后触发 Action 。但是 1 个像素太敏感了，手指轻轻一动就可以触发。

@IBAction func myTouchDragInsideAction(sender: UIButton) {

    print("Button dragged inside")

}

问题:

我如何扩展此操作以在移动至少 5 个像素后仅触发内部拖动操作？

Answer 1

您必须为其创建自定义按钮。关注 CustomButton 可能会对您有所帮助。

let DelayPoint:CGFloat = 5

class CustomButton: UIButton {

    var startPoint:CGPoint?

    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

        if self.startPoint == nil {
          self.startPoint = touches.first?.previousLocationInView(self)
        }


        if self.shouldAllowForSendActionForPoint((touches.first?.locationInView(self))!) {
            super.touchesMoved(touches, withEvent: event)
        }
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.startPoint = nil
        super.touchesEnded(touches, withEvent: event)
    }

    func shouldAllowForSendActionForPoint(location:CGPoint) -> Bool {

        if self.startPoint != nil {

            let xDiff = (self.startPoint?.x)! - location.x
            let yDiff = (self.startPoint?.y)! - location.y

            if (xDiff > DelayPoint || xDiff < -DelayPoint || yDiff > DelayPoint || yDiff < -DelayPoint) {

                return true
            }
        }
        return false
    }
}

您可以根据您的要求更改“DelayPoint”。希望这对您有所帮助。