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//第一种添加水印方法
-(UIImage *)watermarkImage:(UIImage *)img withName:(NSString *)name
{
NSString* mark = name;
int w = img.size.width;
int h = img.size.height;
UIGraphicsBeginImageContext(img.size);
[img drawInRect:CGRectMake(, , w, h)];
NSDictionary *attr = @{
NSFontAttributeName: [UIFont boldSystemFontOfSize:],//设置字体
NSForegroundColorAttributeName : [UIColor redColor] //设置字体颜色
};
[mark drawInRect:CGRectMake(, , , ) withAttributes:attr];//左上角
[mark drawInRect:CGRectMake(w - , , , ) withAttributes:attr]; //右上角
[mark drawInRect:CGRectMake(w - , h - - , , ) withAttributes:attr]; //右下角
[mark drawInRect:CGRectMake(, h - - , , ) withAttributes:attr]; //左下角
UIImage *aimg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return aimg;
}
//第二种 画水印方法- (UIImage *) imageWithWaterMask:(UIImage*)mask inRect:(CGRect)rect { #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000 if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) { UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device‘s main screen". } #else if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0) { UIGraphicsBeginImageContext([self size]); } #endif //原图 [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)]; //水印图 [mask drawInRect:rect]; UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return newPic; }
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原文地址：http://www.cnblogs.com/Wild-orangutans/p/5162326.html
