图片上添加文字

Objective-C
- (UIImage *) addText:(UIImage *)img text:(NSString *)mark {
    int w = img.size.width;
    int h = img.size.height;
    UIGraphicsBeginImageContext(img.size);
    [[UIColor redColor] set];
    [img drawInRect:CGRectMake(0, 0, w, h)];
    [mark drawInRect:CGRectMake(10, 55, 130, 80) withFont:[UIFont systemFontOfSize:18]];
    UIImage *aimg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return aimg;

}