//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;

}