iOS 文字转化成图片

//文字转化成图片

-(UIImage *)imageFromText:(NSArray*)arrContent withFont:(CGFloat)fontSize withTextColor:(UIColor *)textColor withBgImage:(UIImage *)bgImage withBgColor:(UIColor *)bgColor

{

    // set the font type and size

    

    UIFont *font = [UIFont fontWithName:@"Heiti SC" size:fontSize];

    NSMutableArray *arrHeight = [[NSMutableArray alloc] initWithCapacity:arrContent.count];

    

    CGFloat fHeight = 0.0f;

    for (NSString *sContent in arrContent) {

        CGSize stringSize = [sContent sizeWithFont:font constrainedToSize:CGSizeMake(CONTENT_MAX_WIDTH, 10000) lineBreakMode:NSLineBreakByWordWrapping];

        [arrHeight addObject:[NSNumber numberWithFloat:stringSize.height]];

        

        fHeight += stringSize.height;

    }

    

    CGSize newSize = CGSizeMake(CONTENT_MAX_WIDTH+20, fHeight+50);

    

    // Create a stretchable image for the top of the background and draw it

    UIGraphicsBeginImageContextWithOptions(newSize,NO,0.0);

    CGContextRef ctx = UIGraphicsGetCurrentContext();

    

    //如果设置了背景图片

    if(bgImage)

    {

        UIImage* stretchedTopImage = [bgImage stretchableImageWithLeftCapWidth:0 topCapHeight:0];

        [stretchedTopImage drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

    }else

    {

        if(bgColor)

        {

            //填充背景颜色

            [bgColor set];

            UIRectFill(CGRectMake(0, 0, newSize.width, newSize.height));

        }

    }

    

    CGContextSetCharacterSpacing(ctx, 10);

    CGContextSetTextDrawingMode (ctx, kCGTextFillClip);

    [textColor set];

    

    int nIndex = 0;

    CGFloat fPosY = 20.0f;

    for (NSString *sContent in arrContent) {

        NSNumber *numHeight = [arrHeight objectAtIndex:nIndex];

        CGRect rect = CGRectMake(10, fPosY, CONTENT_MAX_WIDTH , [numHeight floatValue]);

        

        [sContent drawInRect:rect withFont:font lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentLeft];

        

        fPosY += [numHeight floatValue];

        nIndex++;

    }

    

    // transfer image

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return image;

    

}