代码中怎么新建一个相簿？

最新推荐文章于 2021-05-16 08:05:05 发布

转载最新推荐文章于 2021-05-16 08:05:05 发布 · 2k 阅读

本文介绍了一种在iOS设备上创建自定义相册并将图片保存到该相册的方法。通过使用ALAssetsLibrary，可以实现图片的保存，并且能够指定图片所属的相册名称。此外，还提供了一个解决方案来解决保存二维码图片时显示全黑的问题。

转载自：http://www.cocoachina.com/bbs/read.php?tid=143383
我的创建相册代码：

-
 (void)saveToAlbumWithMetadata:(NSDictionary*)metadata

                      imageData:(NSData*)imageData

                customAlbumName:(NSString*)customAlbumName

                completionBlock:(void(^)(void))completionBlock

                   failureBlock:(void(^)(NSError*error))failureBlock

{

    ALAssetsLibrary
 *assetsLibrary = [[ALAssetsLibrary alloc] init];

    void(^AddAsset)(ALAssetsLibrary
 *, NSURL*)
 = ^(ALAssetsLibrary *assetsLibrary, NSURL*assetURL)
 {

        [assetsLibrary
 assetForURL:assetURL resultBlock:^(ALAsset *asset) {

            [assetsLibrary
 enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, 
BOOL*stop)
 {

                if([[group
 valueForProperty:ALAssetsGroupPropertyName] isEqualToString:customAlbumName]) {

                    [group
 addAsset:asset];

                    if(completionBlock)
 {

                        completionBlock();

                    }

                }

            }
 failureBlock:^(NSError*error)
 {

                if(failureBlock)
 {

                    failureBlock(error);

                }

            }];

        }
 failureBlock:^(NSError*error)
 {

            if(failureBlock)
 {

                failureBlock(error);

            }

        }];

    };

    [assetsLibrary
 writeImageDataToSavedPhotosAlbum:imageData metadata:metadata completionBlock:^(NSURL*assetURL,
NSError*error)
 {

        if(customAlbumName)
 {

            [assetsLibrary
 addAssetsGroupAlbumWithName:customAlbumName resultBlock:^(ALAssetsGroup *group) {

                if(group)
 {

                    [assetsLibrary
 assetForURL:assetURL resultBlock:^(ALAsset *asset) {

                        [group
 addAsset:asset];

                        if(completionBlock)
 {

                            completionBlock();

                        }

                    }
 failureBlock:^(NSError*error)
 {

                        if(failureBlock)
 {

                            failureBlock(error);

                        }

                    }];

                }else{

                    AddAsset(assetsLibrary,
 assetURL);

                }

            }
 failureBlock:^(NSError*error)
 {

                AddAsset(assetsLibrary,
 assetURL);

            }];

        }else{

            if(completionBlock)
 {

                completionBlock();

            }

        }

    }];

}

-
 (void)saveImage:(UIImage*)image{

    ALAssetsLibrary
 *assetsLibrary = [[ALAssetsLibrary alloc] init];

    NSMutableArray*groups=[[NSMutableArrayalloc]init];

    ALAssetsLibraryGroupsEnumerationResultsBlock
 listGroupBlock = ^(ALAssetsGroup *group, BOOL*stop)

    {

        if(group)

        {

            [groups
 addObject:group];

        }

        else

        {

            BOOLhaveHDRGroup
 = NO;

            for(ALAssetsGroup
 *gp in groups)

            {

                NSString*name
 =[gp valueForProperty:ALAssetsGroupPropertyName];

                if([name
 isEqualToString:@"Flickr墙纸"])

                {

                    haveHDRGroup
 = YES;

                }

            }

            if(!haveHDRGroup)

            {

                //do
 add a group named "HDR"

                [assetsLibrary
 addAssetsGroupAlbumWithName:@"Flickr墙纸"

                                               resultBlock:^(ALAssetsGroup
 *group)

                 {

                     [groups
 addObject:group];

                 }

                                              failureBlock:nil];

                haveHDRGroup
 = YES;

            }

        }

    };

    //创建相簿

    [assetsLibrary
 enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:listGroupBlock failureBlock:nil];

//在我的"扫一扫"代码中，生成的二维码图片存到新创建的相薄后显示全黑，后同事指点原来是下边红色方法的问题，后换了个方法实现了：
UIImageJPEGRepresentation(image,1)

    [selfsaveToAlbumWithMetadata:nilimageData:UIImagePNGRepresentation(image)
 customAlbumName:@"Flickr墙纸"completionBlock:^

    {

        UIAlertView
 *alert=[[UIAlertView alloc]initWithTitle:@"保存成功"message:@"若想马上启用该墙纸，请进入图库找到该墙纸并设置为墙纸即可，感谢您的使用。"delegate:nilcancelButtonTitle:@"好"otherButtonTitles:
nil];

        [alert
 show];

    }
 failureBlock:^(NSError*error)

    {

        UIAlertView
 *alert=[[UIAlertView alloc]initWithTitle:@"保存失败"message:error.description
 delegate:nilcancelButtonTitle:@"知道了"otherButtonTitles:
nil];

        [alert
 show];

//chenyong
 下面这个方法可判断是否是因为用户拒绝访问地址所致 我测试了下，如果是中文环境返回 的是“用户拒绝访问”

if
 (([myerror.localizedDescription rangeOfString:@"User
 denied access"].location!=NSNotFound ）|| （[myerror.localizedDescription
 rangeOfString:@"用户拒绝访问"].location!=NSNotFound）)

    }];

}