UIView无限360度旋转动画?

我试图旋转一个UIImageView 360度，并在网上看了几个教程。我不能让它们都工作，UIView要么停止，要么跳转到一个新位置。

我怎样才能做到这一点呢?

我最近尝试的是:

[UIView animateWithDuration:1.0
                      delay:0.0
                    options:0
                 animations:^{
                     imageToMove.transform = CGAffineTransformMakeRotation(M_PI);
                 } 
                 completion:^(BOOL finished){
                     NSLog(@"Done!");
                 }];

但如果我使用2*pi，它根本不会移动(因为它是相同的位置)。如果我尝试只做(180度)，它可以工作，但如果我再次调用这个方法，它会向后旋转。

编辑:

[UIView animateWithDuration:1.0
                      delay:0.0
                    options:0
                 animations:^{
                     [UIView setAnimationRepeatCount:HUGE_VALF];
                     [UIView setAnimationBeginsFromCurrentState:YES];
                     imageToMove.transform = CGAffineTransformMakeRotation(M_PI);
                 } 
                 completion:^(BOOL finished){
                     NSLog(@"Done!");
                 }];

也不管用。它会转到180度，暂停一秒钟，然后在重新开始之前重置回0度。

当前回答

这对我很管用:

[UIView animateWithDuration:1.0
                animations:^
{
    self.imageView.transform = CGAffineTransformMakeRotation(M_PI);
    self.imageView.transform = CGAffineTransformMakeRotation(0);
}];

2016-02-29 18:49:38

其他回答

Swift 3:

 var rotationAnimation = CABasicAnimation()
     rotationAnimation = CABasicAnimation.init(keyPath: "transform.rotation.z")
     rotationAnimation.toValue = NSNumber(value: (M_PI * 2.0))
     rotationAnimation.duration = 2.0
     rotationAnimation.isCumulative = true
     rotationAnimation.repeatCount = 10.0
     view.layer.add(rotationAnimation, forKey: "rotationAnimation")

2016-12-27 07:53:51

这是我的快速解决方案作为一个UIView扩展。它可以被认为是任何UIImageView上UIActivityIndicator行为的模拟。

import UIKit

extension UIView
{

    /**
    Starts rotating the view around Z axis.

    @param duration Duration of one full 360 degrees rotation. One second is default.
    @param repeatCount How many times the spin should be done. If not provided, the view will spin forever.
    @param clockwise Direction of the rotation. Default is clockwise (true).
     */
    func startZRotation(duration duration: CFTimeInterval = 1, repeatCount: Float = Float.infinity, clockwise: Bool = true)
    {
        if self.layer.animationForKey("transform.rotation.z") != nil {
            return
        }
        let animation = CABasicAnimation(keyPath: "transform.rotation.z")
        let direction = clockwise ? 1.0 : -1.0
        animation.toValue = NSNumber(double: M_PI * 2 * direction)
        animation.duration = duration
        animation.cumulative = true
        animation.repeatCount = repeatCount
        self.layer.addAnimation(animation, forKey:"transform.rotation.z")
    }


    /// Stop rotating the view around Z axis.
    func stopZRotation()
    {
        self.layer.removeAnimationForKey("transform.rotation.z")
    }

}

2016-04-15 09:13:59

我发现了一个非常适合我的方法(我稍微修改了一下):iphone UIImageView旋转

#import <QuartzCore/QuartzCore.h>

- (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:(CGFloat)rotations repeat:(float)repeat {
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/ * rotations * duration ];
    rotationAnimation.duration = duration;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = repeat ? HUGE_VALF : 0;

    [view.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

2012-03-23 19:41:16

import UIKit

class RotatingImageView: UIImageView, CAAnimationDelegate {
    
    private let rotationAnimationKey = "rotationAnimationKey"

    private var shouldStopRotating = false
    
    func startRotating(witFullRotationDuration duration: Double = 0.5, halfRotation: Bool = true) {
        
        shouldStopRotating = false
        if layer.animation(forKey: rotationAnimationKey) == nil {
        
            let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation")
            rotationAnimation.fromValue = 0.0
            rotationAnimation.toValue = halfRotation ? Float.pi : Float.pi * 2
            rotationAnimation.duration = duration
            rotationAnimation.repeatCount = 1
            rotationAnimation.delegate = self
            layer.add(rotationAnimation, forKey: rotationAnimationKey)
        
        }
        
    }

    func stopRotating(immediately: Bool = false) {
        if immediately {
            if layer.animation(forKey: rotationAnimationKey) != nil {
                layer.removeAnimation(forKey: rotationAnimationKey)
            }
        } else {
            shouldStopRotating = true
        }
    }
    
    func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
    
        if !shouldStopRotating {
            startRotating(witFullRotationDuration: anim.duration)
        } else {
            if layer.animation(forKey: rotationAnimationKey) != nil {
                layer.removeAnimation(forKey: rotationAnimationKey)
            }
        }
        
    }
    
}

2022-02-17 17:41:13

我已经开发了一个闪亮的动画框架，可以节省你的时间! 使用它可以很容易地创建这个动画:

private var endlessRotater: EndlessAnimator!
override func viewDidAppear(animated: Bool) 
{
    super.viewDidAppear(animated)
    let rotationAnimation = AdditiveRotateAnimator(M_PI).to(targetView).duration(2.0).baseAnimation(.CurveLinear)
    endlessRotater = EndlessAnimator(rotationAnimation)
    endlessRotater.animate()
}

要停止这个动画，只需将nil设置为endlessRotater。

如果你感兴趣，请看看:https://github.com/hip4yes/Animatics

2015-10-19 21:09:23

UIView无限360度旋转动画?

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