想让图片有阻尼的旋转,然后停下来,该怎么做?
这应该就是你要的效果: https://github.com/rdsquared09/Circul...
UIViewAnimationOptionCurveEaseOut
An ease-out curve causes the animation to begin quickly, and then slow as it completes.
keyframe animation
CALayer *layer = rotatingImage.layer; CAKeyframeAnimation *animation; animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"]; animation.duration = 0.5f; animation.cumulative = YES; animation.repeatCount = 1; animation.values = [NSArray arrayWithObjects: // i.e., Rotation values for the 3 keyframes, in RADIANS [NSNumber numberWithFloat:0.0 * M_PI], [NSNumber numberWithFloat:0.75 * M_PI], [NSNumber numberWithFloat:1.5 * M_PI], nil]; animation.keyTimes = [NSArray arrayWithObjects: // Relative timing values for the 3 keyframes [NSNumber numberWithFloat:0], [NSNumber numberWithFloat:.5], [NSNumber numberWithFloat:1.0], nil]; animation.timingFunctions = [NSArray arrayWithObjects: [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn], // from keyframe 1 to keyframe 2 [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut], nil]; // from keyframe 2 to keyframe 3 animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; [layer addAnimation:animation forKey:nil];