给图片添加水印(水印为文字和图片)

Posted on 2016-07-04 19:21  柠檬片  阅读(179)  评论(0)    收藏  举报 
 1  //1.加载要添加水印图片
 2     UIImage * image = [UIImage imageNamed:@"img05"];
 3     
 4     //2.开启和图片大小相同的图形上下文(bitmap)
 5     UIGraphicsBeginImageContextWithOptions(image.size, NO, 0.0);
 6     
 7     
 8     //3.把图片绘制到刚刚开启的图形上下文中
 9     [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
10     
11     
12     //4.添加文字水印
13     NSString * text = @"美人你一直是我的春天,你是我的世外桃源";
14     
15     NSDictionary * attrs = @{NSForegroundColorAttributeName:[UIColor redColor],
16                              NSFontAttributeName:[UIFont systemFontOfSize:20.f]
17                              };
18     [text drawInRect:CGRectMake(200, 500, 300, 200) withAttributes:attrs];
19     
20     
21     
22     //4.1 添加图片水印
23     //加载水印图片
24     UIImage * logoImage = [UIImage imageNamed:@"logo"];
25     
26     [logoImage drawInRect:CGRectMake(300, 700, 101, 38)];
27     
28     //5.从图形上下文中获取图片
29     UIImage * getImage = UIGraphicsGetImageFromCurrentImageContext();
30     
31     //5.1 结束上下文
32     UIGraphicsEndImageContext();
33     
34     //6.保存图片到相册
35     UIImageWriteToSavedPhotosAlbum(getImage, nil, nil, nil);
图片/文字水印