在做扫描动画效果时扫描动画写法

最好用这种个人感觉：

- (void)scanAnimation

{

    if ([UIDevicecurrentDevice].batteryState==UIDeviceBatteryStateUnplugged) {

        self.scanImageView.alpha =0.0;

        return;

    }

    

    self.scanImageView.alpha =0.5;

    self.scanImageView.frame =CGRectMake(28,GNDEVICE_SCREEN_HEIGHT-82,320, 82);

    

    [UIViewbeginAnimations:@"ChargeViewAnimationID"context:NULL];

    [UIViewsetAnimationDuration:5.0];

    [UIViewsetAnimationCurve:UIViewAnimationCurveEaseIn];

    [UIViewsetAnimationRepeatAutoreverses:NO];

    [UIViewsetAnimationRepeatCount:MAXFLOAT];

    self.scanImageView.frame =CGRectMake(28, -82,320, 82);

    [UIViewcommitAnimations];

}

用下面这种方法会出现莫名的问题，例如不用调用到dealloc

- (void)scanAnimation

{

    if ([UIDevicecurrentDevice].batteryState==UIDeviceBatteryStateUnplugged) {

        self.scanImageView.alpha =0.0;

        return;

    } 

    

    self.scanImageView.alpha =0.5;

    self.scanImageView.frame =CGRectMake(28,GNDEVICE_SCREEN_HEIGHT-82,320, 82);

    [UIViewanimateWithDuration:5.0animations:^{

        self.scanImageView.frame =CGRectMake(28, -82,320, 82);

    } completion:^(BOOL finished) {

        [selfscanAnimation];

    } ];

}