旋转 UIButton 360 度

问题描述

我一直在尝试使用以下代码运行将我的 UIButton 旋转 360 度的动画:

I've been trying to run an animation that rotates my UIButton 360 degrees using this code:

UIView.animateWithDuration(3.0, animations: {
  self.vineTimeCapButton.transform = CGAffineTransformMakeRotation(CGFloat(M_PI*2))
  self.instagramTimeCapButton.transform = CGAffineTransformMakeRotation(CGFloat(M_PI*2))
})

但是，它不会旋转 360 度，因为 UIButton 已经在那个位置.

However, it doesn't rotate 360 degrees because the UIButton is already at that location.

如何将我的 UIButton 旋转 360 度?

How can I rotate my UIButton 360 degrees?

推荐答案

可以使用一个技巧:先旋转180度，再旋转360度.使用 2 个延迟动画.试试这个.

You can use a trick: start rotating with 180 degrees first and then rotate with 360 degrees. Use 2 animations with delay. Try this.

斯威夫特 2

UIView.animateWithDuration(0.5) { () -> Void in
  button.transform = CGAffineTransformMakeRotation(CGFloat(M_PI))
}

UIView.animateWithDuration(0.5, delay: 0.45, options: UIViewAnimationOptions.CurveEaseIn, animations: { () -> Void in      
  button.transform = CGAffineTransformMakeRotation(CGFloat(M_PI * 2))
}, completion: nil)

斯威夫特 3、4、5

UIView.animate(withDuration: 0.5) { () -> Void in
  self.settingsButton.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
}

UIView.animate(withDuration: 0.5, delay: 0.45, options: UIViewAnimationOptions.curveEaseIn, animations: { () -> Void in
  self.settingsButton.transform = CGAffineTransform(rotationAngle: CGFloat.pi * 2.0)
}, completion: nil)

希望对你有帮助

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