快速旋转 UIImageView 动画

我正在尝试制作 180 度旋转的动画UIImageView在斯威夫特

    UIView.animateWithDuration(1.0, animations: { () -> Void in
        self.arrowImageView.transform = CGAffineTransformMakeRotation(CGFloat(180 * M_PI))
    }) { (succeed) -> Void in

    }

但根本不是动画。 我想使用 animateWithDuration 因为我想在某个时候使用CGAffineTransformMakeIdentity

Using UIView动画作品。

    UIView.beginAnimations(nil, context: nil)
    UIView.setAnimationDuration(1)
    UIView.setAnimationCurve(UIViewAnimationCurve.EaseIn)
    let radians = CGFloat(180 * M_PI / 180)
    arrowImageView.transform = CGAffineTransformMakeRotation(radians)
    UIView.commitAnimations()

======= UIView 的扩展 =======

我从互联网上找到了这个答案，并进行了测试，工作得很好。希望这对任何人都有帮助，只需更改UIView根据您的需要，例如，UIView、UIButton、UIImageView等并通过myUIView.rotate()函数，这里myUIView应该replace with 您的视图名称（IBOutlet -> 名称）具有正确的扩展视图类型。这是link http://ioscake.com/uiview-infinite-360-degree-rotation-animation.html我找到了这个答案。而且这个方法简单又有效！

=== SWIFT 3 / 4 ===

extension UIView{
    func rotate() {
        let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotation.toValue = NSNumber(double: M_PI * 2)
        rotation.duration = 1
        rotation.cumulative = true
        rotation.repeatCount = FLT_MAX
        self.layer.addAnimation(rotation, forKey: "rotationAnimation")
    }
}

建议的改进。感谢您的所有建议。

=== SWIFT 5 ===

extension UIView{
    func rotate() {
        let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotation.toValue = NSNumber(value: Double.pi * 2)
        rotation.duration = 1
        rotation.isCumulative = true
        rotation.repeatCount = Float.greatestFiniteMagnitude
        self.layer.add(rotation, forKey: "rotationAnimation")
    }
}

然后像下面这样调用该扩展：

self.your_UIViewOutletName_myUIView_here.rotate()