图片上写文字

+ (UIImage*)drawText:(NSString*)text inImage:(UIImage*)image atPoint:(CGPoint)point withFont:(UIFont *)font
{
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];
CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);
[[UIColor blackColor] set];
[text drawInRect:CGRectIntegral(rect) withAttributes:@{NSFontAttributeName:font}];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return newImage;
}