问题描述
我试图通过触摸屏幕在屏幕周围拖动 UIImageView
.但是我希望能够不断移动精灵,目前我的代码只将精灵移动到我触摸的位置,如果我在屏幕上按住触摸一段时间然后移动,精灵将跟随.但是我不想必须"触摸 UIImageView
来激活运动,我想触摸屏幕上的任何地方并从 UIImageView
获得运动响应,从其当前位置.
I'm trying to drag a UIImageView
around the screen by touching the screen. But I want to be able to do a constant movement of the Sprite, currently my code only moves the sprite to the location of my touch and if I hold on touch on screen for some amount of time and then move, the sprite will follow. However I don't want to "have" to touch the UIImageView
to activate the movement, I want to touch anywhere on the screen and have a movement response from that UIImageView
, from its current location.
这是我的代码.
var location = CGPoint()
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
if let touch = touches.first {
location = touch.locationInView(self.view)
ImageView.center = location}
}
override func prefersStatusBarHidden() -> Bool {
return true
}
感谢您提供的任何帮助.
Thank you for any help you may provide.
推荐答案
这里有一个更简单的实现.只需记住触摸的最后位置并计算差异,并使用差异设置图像的新位置.
Here is a simpler implementation. Just remember the last location of the touch and compute the difference, and use the difference to set the new location of the image.
var lastLocation = CGPoint()
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
if let touch = touches.first {
self.lastLocation = touch.locationInView(self.view)
}
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
if let touch = touches.first {
let location = touch.locationInView(self.view)
self.imageView.center = CGPoint(x: (location.x - self.lastLocation.x) + self.imageView.center.x, y: (location.y - self.lastLocation.y) + self.imageView.center.y)
lastLocation = touch.locationInView(self.view)
}
}
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