| - (UIImage *)imageWithLogoText:(UIImage *)img text:(NSString *)text1
{
/注：此为后来更改，用于显示中文。zyq,2013-5-8
CGSize size = CGSizeMake(200, img.size.height); //设置上下文（画布）大小
UIGraphicsBeginImageContext(size); //创建一个基于位图的上下文(context)，并将其设置为当前上下文
CGContextRef contextRef = UIGraphicsGetCurrentContext(); //获取当前上下文
CGContextTranslateCTM(contextRef, 0, img.size.height); //画布的高度
CGContextScaleCTM(contextRef, 1.0, -1.0); //画布翻转
CGContextDrawImage(contextRef, CGRectMake(0, 0, img.size.width, img.size.height), [img CGImage]); //在上下文种画当前图片
[[UIColor redColor] set]; //上下文种的文字属性
CGContextTranslateCTM(contextRef, 0, img.size.height);
CGContextScaleCTM(contextRef, 1.0, -1.0);
UIFont *font = [UIFont boldSystemFontOfSize:16];
[text1 drawInRect:CGRectMake(0, 0, 200, 80) withFont:font]; //此处设置文字显示的位置
UIImage *targetimg =UIGraphicsGetImageFromCurrentImageContext(); //从当前上下文种获取图片
UIGraphicsEndImageContext(); //移除栈顶的基于当前位图的图形上下文。
return targetimg;
//注：此为原来，不能显示中文。无用。
//get image width and height
int w = img.size.width;
int h = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//create a graphic context with CGBitmapContextCreate
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);
char* text = (char *)[text1 cStringUsingEncoding:NSUnicodeStringEncoding];
CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 255, 0, 0, 1);
CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text));
//Create image ref from the context
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
}
| 
原帖：[url]