第一种方式：
-(UIImage *)watermarkImage:(UIImage *)img withName:(NSString *)name
{
NSString* mark = name;
intw = img.size.width;
inth = 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();
returnaimg;
}
第二种方式：
// 画水印
- (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();
returnnewPic;
}
