Question

- (void)drawRect:(CGRect)rect {
    // Drawing code.
    stickerImage = [UIImage imageNamed:@"betaImage.png"];
    CGSize size = stickerImage.size;
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextTranslateCTM( context, 0.5f * size.width, 0.5f * size.height );
    CGContextRotateCTM (context, 90 * M_PI/180);
    [stickerImage drawInRect:(CGRect){ { -size.width * 0.5f, -size.height * 0.5f }, size }];

    UIGraphicsEndImageContext();
}

I just cannot find whats wrong with my code, it does not showing anything

Answer 1

Yep, you shouldn’t end your context before you get the result image. In your code example you should get the result image:

UIImage* yourImage = UIGraphicsGetImageFromCurrentImageContext();

or just pass ending context to other parent methods;

As Morgan Harris said, all image manipulations should be between UIGraphicsBeginImageContext() and UIGraphicsEndImageContext();