如何在Swift 3.0中拖放精灵?

前端之家收集整理的这篇文章主要介绍了如何在Swift 3.0中拖放精灵?前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。
我所要做的就是能够在屏幕上拖放一个精灵.我试过以下代码
override func touchesBegan(touches: Set<UITouch>,withEvent event: UIEvent?) {
}

override func touchesMoved(touches: Set<UITouch>,withEvent event: UIEvent?) {
    for touch in (touches ) {
        let location = touch.locationInNode(self)
        if ball.containsPoint(location) {
            ball.position = location    
}
}
}

这段代码确实有效,但是当我快速拖动球时,我猜它会检测到“球”不再包含点“位置”并且球停止,这意味着我再次接球.我希望球能够快速响应我的触球,这样球就不会停止移动.我该怎么办?

我有一个实现,我已经将UIImageView子类化并称之为“DraggableImage”
override func touchesBegan(_ touches: Set<UITouch>,with event: UIEvent?) {
        originalPosition = self.center
    }

override func touchesMoved(_ touches: Set<UITouch>,with event: UIEvent?) {
        if let touch = touches.first {
            let position = touch.location(in: self.superview)
            self.center = CGPoint(x: position.x,y: position.y)
        }
    }

override func touchesEnded(_ touches: Set<UITouch>,with event: UIEvent?) {

        self.center = originalPosition
    }

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