iOS add watermarks to pictures

/** * Imagewithbackgroundimage:: * * @param backgroundimage background image name * @param logoimage watermark Image Name * * @return Add watermark image */+ (Instancetype) Imagewithbackgroundimage: (NSString *) backgroundimage withlogoimage: (NSString *) logoImage{UIImage        *image = [UIImage imagenamed:backgroundimage];        1. Open a bitmap-based bitmap context uigraphicsbeginimagecontextwithoptions (image.size, NO, 0.0);        2. Draw background [image drawinrect:cgrectmake (0, 0, Image.size.width, image.size.height)];    3. Draw Watermark//3.1 Set watermark picture frame UIImage *log = [UIImage imagenamed:logoimage];    CGFloat margin = 5.0;    CGFloat scale = 0.2;    CGFloat Logow = log.size.width * scale;    CGFloat Logoh = log.size.height * scale;    CGFloat Logox = Image.size.width-logow-margin;    CGFloat Logoy = Image.size.height-logoh-margin;        3.2 Draw Watermark [log drawinrect:cgrectmake (Logox, Logoy, Logow, Logoh)];       4. Remove the picture from the graphics context UIImage *newimage = Uigraphicsgetimagefromcurrentimagecontext (); return newimage;}

iOS add watermarks to pictures