gistfile1.txt

- (void)startQrCodeImageViewRotateAnimation {
    [UIView animateWithDuration:kSCIQRCodeImageViewRotateAnimationDuration
                          delay:kSCIQRCodeImageViewRotateDelay
         usingSpringWithDamping:kSCIQRCodeImageViewRotateSpringDamping
          initialSpringVelocity:kSCIQRCodeImageViewRotateSpringVelocity
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         self.qrCodeImageView.alpha = 1.0;
                     } completion:^(BOOL finished) {
                         [self startQrCodeImageViewRotateAnimation];
                     }];
}