设置图片不停旋转会卡顿

- (void)rotateWithSpeed:(CGFloat)spd

{

[UIView animateWithDuration:spd

                          delay:0

                        options:UIViewAnimationOptionCurveLinear

                     animations:^{

                         self.blade.transform = CGAffineTransformRotate(self.blade.transform, M_PI_2);

                     }

                     completion:^(BOOL finished){

                         if (finished) {

                             [self rotateWithSpeed:spd];

                         }

                     }];

}

- (void)rotateWithSpeed

{

[UIView animateWithDuration:self.spd

                          delay:0

                        options:UIViewAnimationOptionCurveLinear

                     animations:^{

                         self.blade.transform = CGAffineTransformRotate(self.blade.transform, M_PI_2);

                     }

                     completion:^(BOOL finished){

                         if (finished) {

                             [self rotateWithSpeed];

                         }

                     }];

}