例如封裝請(qǐng)求時(shí)，自定義一個(gè)圖片旋轉(zhuǎn)的提示框，
代碼：

    CABasicAnimation* rotationAnimation;
    //繞哪個(gè)軸，那么就改成什么：這里是繞z軸 ---> transform.rotation.z
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    //旋轉(zhuǎn)角度
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI];
    //每次旋轉(zhuǎn)的時(shí)間（單位秒）
    rotationAnimation.duration = 1;
    rotationAnimation.cumulative = YES;
    rotationAnimation.removedOnCompletion = NO;
    //重復(fù)旋轉(zhuǎn)的次數(shù)，如果你想要無(wú)數(shù)次，那么設(shè)置成MAXFLOAT
    rotationAnimation.repeatCount = MAXFLOAT;
    [self.imageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];

image.png

中心的圖片會(huì)一直旋轉(zhuǎn)