swift - 在 Swift 中重复 CGAffineTransformMakeRotation

Question

我想用一种带有旋转的淡入/淡出来替换 View 。这是我的功能

func animateSendButton(enter: Bool)
{
    let rotation: CGFloat = enter ? 180 : -180

    UIView.animateWithDuration(0.5, animations: {
        let transform = CGAffineTransformMakeRotation(self.DEGREES_TO_RADIANS(rotation))
        self.sendImage.transform = transform
        self.sendImage.layer.opacity = enter ? 0.0 : 0.87
        self.sendImage2.transform = transform
        self.sendImage2.layer.opacity = enter ? 0.87 : 0.0

    })
}

但是，旋转仅工作一次且仅在不透明度发生变化后进行。我尝试使用 CGATransformRotate 但没有成功。

有办法重复吗？

Answer 1

尝试将转换重置为其身份:)

func animateSendButton(enter: Bool)
{
    let alpha = enter ? 0.0 : 0.87
    let transfrom = enter ? CGAffineTransformRotate(CGAffineTransformIdentity, DEGREES_TO_RADIANS(180)) : CGAffineTransformIdentity

    UIView.animateWithDuration(0.6, delay: 0.0, options: .CurveEaseIn, animations: {
        self.sendImage.transform = transform
        self.sendImage.layer.opacity = alpha
        self.sendImage2.transform = transform
        self.sendImage2.layer.opacity = alpha

    }) { (complete) in

    }
}