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

Question

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

Answer 1

#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 anchor ，那么你可以这样做

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