UIImageView旋转动画

Question

我想将一个UIImageView向左/右大约旋转10度，但希望有平滑的动画效果，而不是突然转动，我尝试了以下代码：

player.transform = CGAffineTransformMakeRotation(angle)

- Josh Kahane

Answer 1

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.25]; // Set how long your animation goes for
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

player.transform = CGAffineTransformMakeRotation(angle); // if angle is in radians

// if you want to use degrees instead of radians add the following above your @implementation
// #define degreesToRadians(x)(x * M_PI / 180)
// and change the above code to: player.transform = CGAffineTransformMakeRotation(degreesToRadians(angle));

[UIView commitAnimations];

// The rotation code above will rotate your object to the angle and not rotate beyond that.
// If you want to rotate the object again but continue from the current angle, use this instead:
// player.transform = CGAffineTransformRotate(player.transform, degreesToRadians(angle));

- Nigel Greens Apps

Answer 2

我使用类似这样的代码来实现类似的效果（尽管我将其旋转了360度）:

CABasicAnimation *rotate;
rotate = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
rotate.fromValue = [NSNumber numberWithFloat:0];
rotate.toValue = [NSNumber numberWithFloat:deg2rad(10)];
rotate.duration = 0.25;
rotate.repeatCount = 1;
[self.view.layer addAnimation:rotate forKey:@"10"];

我使用类似这样的代码来旋转图像视图。

- jer

---

我需要使用弧度值来表示旋转角度吗？第一次使用时，提示deg2rad未声明，这是什么意思？同时CABasicAnimation也未声明。 - Josh Kahane

是的，你需要弧度值；deg2rad只是一个占位符，用于将你的10度转换为弧度。 - jer

Answer 3

转换为Swift 3/4：

let animation = CABasicAnimation(keyPath: "transform.rotation")
animation.fromValue = 0
animation.toValue =  Double.pi * 2.0
animation.duration = 2
animation.repeatCount = .infinity
animation.isRemovedOnCompletion = false

imageView.layer.add(animation, forKey: "spin")

- Alex

Answer 4

我有一些代码可以使物体旋转360度：

  - (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: rotations * 2.0 /* full rotation*/ * rotations * duration ];
    rotationAnimation.duration = duration;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = repeat;
    [view.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

请执行以下代码：

[self runSpinAnimationOnView:imgView duration:0.1 rotations:M_PI_4 repeat:10];

这段代码可以让动画在视图上旋转一定角度，然后再次旋转。

    - (void)rotateImage:(UIImageView *)image duration:(NSTimeInterval)duration delay:(NSTimeInterval)delay
              curve:(int)curve rotations:(CGFloat)rotations
{
    [UIView animateWithDuration:duration
                          delay:delay
                        options:0
                     animations:^{
                         [UIView setAnimationCurve:curve];
                         image.transform = CGAffineTransformMakeRotation(rotations);

                     }
                     completion:^(BOOL finished){
                         [self rotateImage2:image duration:duration delay:delay curve:curve rotations:rotations];
                         ;
                     }];
    [UIView commitAnimations];

}
- (void)rotateImage2:(UIImageView *)image duration:(NSTimeInterval)duration delay:(NSTimeInterval)delay
               curve:(int)curve rotations:(CGFloat)rotations
{
    [UIView animateWithDuration:duration
                          delay:delay
                        options:0
                     animations:^{
                         [UIView setAnimationCurve:curve];
                         image.transform = CGAffineTransformMakeRotation(-rotations);
                     }
                     completion:^(BOOL finished){
                         [self rotateImage:image duration:duration delay:delay curve:curve rotations:rotations];
                         ;
                     }];
    [UIView commitAnimations];

}

如果你想将一个 uiimageview 向左或向右旋转大约 10 度，可以调用：[self rotateImage:imgView duration:0.7 delay:0.0 curve:UIViewAnimationCurveEaseIn rotations:(M_PI/18)]; 类似地，可以旋转一些度数。

- Lê Trinh

Answer 5

一种现代的 Swift 解决方案，使用 NSTimer 和 CGAffineTransformMakeRotation：

class Rotation: UIViewController {
    var timer = NSTimer()
    var rotAngle: CGFloat = 0.0

    @IBOutlet weak var rotationImage: UIImageView!

    override func viewDidLoad() {
      super.viewDidLoad()
      activateTimer()
    }

    func activateTimer() {
      //(1)
      timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target:self, selector:#selector(Rotation.updateCounter), userInfo: nil, repeats: true) 
    }

    func updateCounter() {
      //(2)
      var rotateLeft: Bool = true
      if rotateLeft {
        rotAngle -= 30.0
      } else {
        rotAngle += 30.0
      }
      //(3)
      UIView.animateWithDuration(2.0, animations: {
        self.rotationImage.transform = CGAffineTransformMakeRotation((self.rotAngle * CGFloat(M_PI)) / 180.0)
      })
    }
}

需要注意的事项：

• 将插座连接到 UIImageView

• 调整计时器速度、动画速度和旋转角度，以获得所需的结果。这组变量对我有效。

- Idan