ios 给图片添加水印

//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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