旋转动画

Question

我正在旋转45度的箭头。动画结束时，箭头返回到原始状态（0度）。我需要箭头不会回到原始状态，它会在动画结束时旋转45度。

CABasicAnimation *fullRotationShort = [CABasicAnimation animationWithKeyPath:@"transform.rotation"]; 
fullRotationShort.fromValue = [NSNumber numberWithFloat:0]; 
fullRotationShort.toValue = [NSNumber numberWithFloat:M_PI/28*4.7]; 
fullRotationShort.duration = 1.0f; 
fullRotationShort.repeatCount = 1; 
[imgViewArrowShort.layer addAnimation:fullRotationShort forKey:nil]; 

Answer 1

设置属性：

fullRotationShort.fillMode = kCAFillModeForwards; 
fullRotationShort.cumulative = YES; 
    fullRotationShort.removedOnCompletion=NO; 

Answer 2

假设你的箭是一个UIImageView命名arrow。
你真的不需要这样复杂的CAAnimations。

[UIView animateWithDuration:1.0 animations:^{ 
    arrow.transform = CGAffineTransformMakeRotation(0.25 * M_PI); 
}];