Question

I know how to flip/reflect/rotate a UIImage by re-drawing it within it’s bounds.

- (IBAction)reflectImageView:(UIImageView)imageView {

    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, 0.0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextTranslateCTM(context, 0.0, -imageView.bounds.size.height);


   [imageView.layer renderInContext:context];
    imageView.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

}

But how do I create a “flip/reflect” effect for any UIView, preferably keeping it’s center in the same position as before?

Thank you!

Answer 1

 [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.75];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.activeView cache:YES];
    //        [self.activeView removeFromSuperview];
    [UIView commitAnimations];

    NSNumber* isReflected = [self.activeView.attributedView.attributes valueForKey:kIsReflected];
    if(isReflected.boolValue)
    {
        self.activeView.transform = CGAffineTransformMakeScale(1,1);
        [self.activeView.attributedView.attributes setValue: [NSNumber numberWithBool:NO]  forKey:kIsReflected];
    }else {
        //do reflection
        self.activeView.transform = CGAffineTransformMakeScale(-1,1);
        [self.activeView.attributedView.attributes setValue: [NSNumber numberWithBool:YES]  forKey:kIsReflected];
    }

Above code is used for UIView Animation. Where you will get an options for various type animation.