UIView 无限 360 度旋转动画?

问题描述

我正在尝试将 UIImageView 旋转 360 度，并在线查看了几个教程.没有 UIView 停止或跳转到新位置，我无法让它们工作.

I'm trying to rotate a UIImageView 360 degrees, and have looked at several tutorials online. I could get none of them working, without the UIView either stopping, or jumping to a new position.

• 我怎样才能做到这一点?

我尝试过的最新方法是:

The latest thing I've tried is:

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

但是如果我使用 2*pi，它根本不会移动(因为它的位置相同).如果我尝试只做 pi(180 度)，它可以工作，但如果我再次调用该方法，它会向后旋转.

But if I use 2*pi, it doesn't move at all (since it's the same position). If I try to do just pi (180 degrees), it works, but if I call the method again, it rotates backwards.

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!");
                 }];

也不行.它转到 180 度，暂停一秒钟，然后在再次开始之前重置回 0 度.

doesn't work either. It goes to 180 degrees, pauses for a split second, then resets back to 0 degrees before it starts again.

推荐答案

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

Found a method (I modified it a bit) that worked perfectly for me: iphone UIImageView rotation

#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"];
}

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