iOS如何让图片有阻尼的旋转-PHP中文网问答

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iOS如何让图片有阻尼的旋转

伊谢尔伦 2017-04-17 11:36:46

[iOS讨论组]

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想让图片有阻尼的旋转，然后停下来，该怎么做？

伊谢尔伦

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ringa_lee2017-04-17 11:38:46 3楼

UIViewAnimationOptionCurveEaseOut
An ease-out curve causes the animation to begin quickly, and then slow as it completes.

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迷茫2017-04-17 11:38:46 2楼

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];

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