ios objectc 将两张图片合并

+ (UIImage *)addTwoImageToOne:(UIImage *)oneImg twoImage:(UIImage *)twoImg topleft:(CGPoint)tlPos
{
        UIGraphicsBeginImageContext(oneImg.size);
        
        [oneImg drawInRect:CGRectMake(0, 0, oneImg.size.width, oneImg.size.height)];
        [twoImg drawInRect:CGRectMake(tlPos.x, tlPos.y, twoImg.size.width, twoImg.size.height)];
        
        UIImage *resultImg = UIGraphicsGetImageFromCurrentImageContext();
        
        UIGraphicsEndImageContext();
        
        return resultImg;
}