如何在Swift 3.0中拖放精灵？

Question

我想做的就是能够在屏幕上拖放精灵。我尝试了以下代码：

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    
}
}
}

该代码确实起作用，但是，当我快速拖动球时，我猜它检测到“球”不再包含点“位置”并且球停止了，这意味着我又将球捡起了。我希望球能够快速响应我的触摸，从而使球不会停止移动。我该怎么做？

Answer 1

我有一个实现，其中我将UIImageView子类化，并将其称为“ 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
    }