你如何旋转 UIView、UIImageView 或 CALayer 动画 360˚?

How do you rotate UIView, UIImageView or CALayer animated 360˚?(你如何旋转 UIView、UIImageView 或 CALayer 动画 360˚?)

问题描述

如何在不使用 OpenGL ES 的情况下旋转 UIView、UIImageView 或 CALayer 动画 360 度?

How do you rotate UIView, UIImageView or CALayer animated 360 degress without using OpenGL ES?

推荐答案

#import <QuartzCore/QuartzCore.h>

CABasicAnimation *fullRotation;
fullRotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
fullRotation.fromValue = @(0.0);
fullRotation.toValue = @((360.0 * M_PI)/180.0);
fullRotation.duration = 3.5f;
fullRotation.repeatCount = MAXFLOAT;

[view.layer addAnimation:fullRotation forKey:@"rotation-animation"];   

如果你想改变它旋转的锚点，那么你可以这样做

If you want to change the anchor point it to rotates around then you can do

CGRect frame = view.layer.frame;
self.anchorPoint = CGPointMake(0.5, 0.5); // rotates around center
self.frame = frame;

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