swift - 快速在屏幕上移动一个像素

Question

我对拥有包含对象和其他对象(静态的，不一定是动态的)的 VC 很感兴趣，除此之外，我想要一个像素(一个或四个，取决于它是否可以人眼所见)在屏幕边界周围移动(因此在边界内)。

我附上我需要的照片:

所以我需要“像素”无限移动做一个正方形，我还需要知道在我的代码中它在哪里做某事(快速)

Answer 1

你可以使用一些解决方案来

swift 2

UIView.animateKeyframesWithDuration(4, delay: 0.0, options: UIViewKeyframeAnimationOptions.Repeat, animations: { () -> Void in

    UIView.addKeyframeWithRelativeStartTime(0, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPointMake(0, 100)
    })
    UIView.addKeyframeWithRelativeStartTime(1/4, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPointMake(100, 100)
    })
    UIView.addKeyframeWithRelativeStartTime(2/4, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPointMake(100, 0)
    })

    UIView.addKeyframeWithRelativeStartTime(3/4, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPointMake(0, 0)
    })

}, completion: nil)

swift 3、4、5

UIView.animateKeyframes(withDuration: 4, delay: 0.0, options: UIView.KeyframeAnimationOptions.repeat, animations: { () -> Void in

    UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPoint(x: 0, y: 100)
    })
    UIView.addKeyframe(withRelativeStartTime: 1/4, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPoint(x: 100, y: 100)
    })
    UIView.addKeyframe(withRelativeStartTime: 2/4, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPoint(x: 100, y: 0)
    })

    UIView.addKeyframe(withRelativeStartTime: 3/4, relativeDuration: 1/4, animations: { () -> Void in
        self.aView.center = CGPoint(x: 0, y: 0)
    })

}, completion: nil)

CGPoint 值是您希望 UIView 对象移动的屏幕的 4 个角。