文字添加到图片上面

-(UIImage *)CSImage:(UIImage *)img AddText:(NSString *)text

{

    UIImageView *view = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, img.size.width, img.size.height)];

    view.image = img;

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];

    [label setNumberOfLines:0];

    label.lineBreakMode = UILineBreakModeWordWrap;

    NSString *s = text;

    UIFont *font = [UIFont fontWithName:@"Arial" size:12];

    CGSize size = CGSizeMake(320,2000);

    CGSize labelsize = [s sizeWithFont:font constrainedToSize:size lineBreakMode:UILineBreakModeWordWrap];

    label.frame = CGRectMake(0,0, labelsize.width, labelsize.height);

    [view addSubview:label];

    return [self convertViewToImage:view];

}

-(UIImage*)convertViewToImage:(UIView*)v

{

    CGSize s = v.bounds.size;

    UIGraphicsBeginImageContextWithOptions(s, NO, [UIScreen mainScreen].scale);

    CGContextRef context = UIGraphicsGetCurrentContext();

    [v.layer renderInContext:context];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    v.layer.contents = nil;

    return image;

}