在 Swift 中无限地旋转 360 度视图？

Question

我想无限地旋转图像视图 360 度。

UIView.animate(withDuration: 2, delay: 0, options: [.repeat], animations: {
    self.view.transform = CGAffineTransform(rotationAngle: 6.28318530717959)
}, completion: nil)

我该怎么做？

Answer 1

Swift 2.x 无限期旋转 UIView 的方法，从早期的答案编译：

// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
    UIView.animateWithDuration(duration, delay: 0.0, options: .CurveLinear, animations: {
        targetView.transform = CGAffineTransformRotate(targetView.transform, CGFloat(M_PI))
    }) { finished in
        self.rotateView(targetView, duration: duration)
    }
}

更新 Swift 3.x

// Rotate <targetView> indefinitely
private func rotateView(targetView: UIView, duration: Double = 1.0) {
    UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
        targetView.transform = targetView.transform.rotated(by: CGFloat(M_PI))
    }) { finished in
        self.rotateView(targetView: targetView, duration: duration)
    }
}

Answer 2

斯威夫特 3.0

let imgViewRing = UIImageView(image: UIImage(named: "apple"))
imgViewRing.frame = CGRect(x: 0, y: 0, width: UIImage(named: "apple")!.size.width, height: UIImage(named: "apple")!.size.height)
imgViewRing.center = CGPoint(x: self.view.frame.size.width/2.0, y: self.view.frame.size.height/2.0)
rotateAnimation(imageView: imgViewRing)
self.view.addSubview(imgViewRing)

这是动画逻辑

func rotateAnimation(imageView:UIImageView,duration: CFTimeInterval = 2.0) {
        let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
        rotateAnimation.fromValue = 0.0
        rotateAnimation.toValue = CGFloat(.pi * 2.0)
        rotateAnimation.duration = duration
        rotateAnimation.repeatCount = .greatestFiniteMagnitude

        imageView.layer.add(rotateAnimation, forKey: nil)
    }

您可以在此链接中检查输出

Answer 3

使用这个扩展来旋转 UIImageView 360 度。

extension UIView {
func rotate360Degrees(duration: CFTimeInterval = 1.0, completionDelegate: AnyObject? = nil) {
    let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
    rotateAnimation.fromValue = 0.0
    rotateAnimation.toValue = CGFloat(M_PI)
    rotateAnimation.duration = duration

    if let delegate: CAAnimationDelegate = completionDelegate as! CAAnimationDelegate? {
        rotateAnimation.delegate = delegate
    }
    self.layer.addAnimation(rotateAnimation, forKey: nil)
}
}

比旋转 UIImageView 只需使用此方法

self.YOUR_SUBVIEW.rotate360Degrees()

Answer 4

这个在 Swift 2.2 中对我有用：

let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
rotationAnimation.fromValue = 0.0
rotationAnimation.toValue = 360 * CGFloat(M_PI/180)
let innerAnimationDuration : CGFloat = 1.0
rotationAnimation.duration = Double(innerAnimationDuration)
rotationAnimation.repeatCount = HUGE
self.imageView.addAnimation(rotationAnimation, forKey: "rotateInner")

Answer 5

我会把它放在像rotateImage()这样的函数中，在完成代码中再次调用rotateImage() 。 不过，我认为您应该使用 M_PI（或 swift 等效项）作为旋转量。

Answer 6

针对 Swift 3 进行了更新：我对 UIView 进行了扩展，并在其中包含了以下函数：

func rotate(fromValue: CGFloat, toValue: CGFloat, duration: CFTimeInterval = 1.0, completionDelegate: Any? = nil) {

let rotateAnimation = CABasicAnimation(keyPath: >"transform.rotation")
rotateAnimation.fromValue = fromValue
rotateAnimation.toValue = toValue
rotateAnimation.duration = duration

if let delegate: Any = completionDelegate {
rotateAnimation.delegate = delegate as? CAAnimationDelegate
}
self.layer.add(rotateAnimation, forKey: nil)

}

然后，您可以通过（例如，在我制作成按钮的 UIView 上）调用该函数：

monitorButton.rotate(fromValue: 0.0, toValue: CGFloat(M_PI * 2), completionDelegate: self)

希望这可以帮助！

Answer 7

我认为您在这里真正想要的是使用CADisplayLink 。 原因是与使用可能导致轻微打嗝且不容易取消的完成块相比，这将无限期地平滑。 请参阅以下解决方案：

var displayLink : CADisplayLink?
var targetView = UIView()

func beginRotation () {

    // Setup display link
    self.displayLink = CADisplayLink(target: self, selector: #selector(onFrameInterval(displayLink:)))
    self.displayLink?.preferredFramesPerSecond = 60
    self.displayLink?.add(to: .current, forMode: RunLoop.Mode.default)
}

func stopRotation () {

    // Invalidate display link
    self.displayLink?.invalidate()
    self.displayLink = nil
}

// Called everytime the display is refreshed
@objc func onFrameInterval (displayLink: CADisplayLink) {

    // Get frames per second
    let framesPerSecond = Double(displayLink.preferredFramesPerSecond)

    // Based on fps, calculate how much target view should spin each interval
    let rotationsPerSecond = Double(3)
    let anglePerSecond = rotationsPerSecond * (2 * Double.pi)
    let anglePerInterval = CGFloat(anglePerSecond / framesPerSecond)

    // Rotate target view to match the current angle of the interval
    self.targetView.layer.transform = CATransform3DRotate(self.targetView.layer.transform, anglePerInterval, 0, 0, 1)

}

Answer 8

避免使用递归调用完成闭包！

这个聚会有点晚了，但是使用 UIView 关键帧动画和每个关键帧的不同旋转阶段，加上设置动画曲线效果很好。 这是一个 UIView 类函数 -

class func rotate360(_ view: UIView, duration: TimeInterval, repeating: Bool = true) {

    let transform1 = CGAffineTransform(rotationAngle: .pi * 0.75)
    let transform2 = CGAffineTransform(rotationAngle: .pi * 1.5)

    let animationOptions: UInt
    if repeating {
        animationOptions = UIView.AnimationOptions.curveLinear.rawValue | UIView.AnimationOptions.repeat.rawValue
    } else {
        animationOptions = UIView.AnimationOptions.curveLinear.rawValue
    }

    let keyFrameAnimationOptions = UIView.KeyframeAnimationOptions(rawValue: animationOptions)

    UIView.animateKeyframes(withDuration: duration, delay: 0, options: [keyFrameAnimationOptions, .calculationModeLinear], animations: {
        UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.375) {
            view.transform = transform1
        }
        UIView.addKeyframe(withRelativeStartTime: 0.375, relativeDuration: 0.375) {
            view.transform = transform2
        }
        UIView.addKeyframe(withRelativeStartTime: 0.75, relativeDuration: 0.25) {
            view.transform = .identity
        }
    }, completion: nil)
}

看起来很粗糙，有奇怪的旋转角度，但正如 op 和其他人发现的那样，你不能只告诉它旋转 360

Answer 9

试试这个对我有用，我正在旋转图像一次

 UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveLinear, animations: {

       self.imgViewReload.transform = CGAffineTransformRotate(self.imgViewReload.transform, CGFloat(M_PI))

 }, completion: {
    (value: Bool) in

          UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveLinear, animations: {
          self.imgViewReload.transform = CGAffineTransformIdentity

         }, completion: nil)
 })

Answer 10

您可以使用此功能...只需给它视图和持续时间

它有两个动画，第一个将视图旋转 180°，另一个将其旋转到 360°，然后函数调用自身，这允许它无限地继续旋转动画

func infinite360Animation(targetView: UIView, duration: Double) {
    UIView.animate(withDuration: duration/2, delay: 0, options: .curveLinear) {
        targetView.transform = CGAffineTransform.identity.rotated(by: .pi )
    } completion: { (_) in
        UIView.animate(withDuration: duration/2, delay: 0, options: .curveLinear) {
            targetView.transform = CGAffineTransform.identity.rotated(by: .pi * 2)
        } completion: { (_) in
            self.infinite360Animation(targetView: targetView, duration: duration)
        }
    }
}

然后你可以像这样调用函数

infinite360Animatio(targetView: yourView, duration: 3)

Answer 11

在您的 tabBarController 上，确保设置您的委托并执行以下didSelect方法：

func tabBarController(_ tabBarController: UITabBarController,
                          didSelect viewController: UIViewController) {
        if let selectedItem:UITabBarItem = tabBarController.tabBar.selectedItem {
            animated(tabBar: tabBarController.tabBar, selectedItem: selectedItem)
        }
    }




fileprivate func animated(tabBar: UITabBar, selectedItem:UITabBarItem){
        if let view:UIView = selectedItem.value(forKey: "view") as? UIView {
            if let currentImageView = view.subviews.first as? UIImageView {
                rotate(imageView: currentImageView, completion: { (completed) in
                    self.restore(imageView: currentImageView, completion: nil)
                })
            }
        }
    }

    fileprivate func rotate(imageView:UIImageView, completion:((Bool) ->Void)?){
        UIView.animate(withDuration: animationSpeed, delay: 0.0, options: .curveLinear, animations: {
            imageView.transform = CGAffineTransform.init(rotationAngle: CGFloat.pi)
        }, completion: {
            (value: Bool) in
            completion?(value)
        })
    }

    fileprivate func restore(imageView:UIImageView, completion:((Bool) ->Void)?){
        UIView.animate(withDuration: animationSpeed, delay: 0.0, options: .curveLinear, animations: {
            imageView.transform = CGAffineTransform.identity
        }, completion: {
            (value: Bool) in
            completion?(value)
        })
    }