设备中创建新相册(粘贴)

二:在手机相册(ios设备相册)中创建相册

第一步:向工程里添加AssetsLibrary 库文件

 

第二步:在项目中"import" 导入库(在哪用就在哪导入)

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#import <AssetsLibrary/AssetsLibrary.h>

 

 

核心代码

在需要添加相册的地方调用代码

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//添加到相册我让它执行是异步执行的方式,如果不想用这种方式,可以不去开一个线程

 dispatch_async(dispatch_get_global_queue(0, 0), ^{

         

        [self createAlbumInPhoneAlbum];

         

    });

 

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#pragma mark - 在手机相册中创建相册

- (void)createAlbumInPhoneAlbum

{

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

    NSMutableArray *groups=[[NSMutableArray alloc]init];

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

    {

        if (group)

        {

            [groups addObject:group];

        }

         

        else

        {

            BOOL haveHDRGroup = NO;

             

            for (ALAssetsGroup *gp in groups)

            {

                NSString *name =[gp valueForProperty:ALAssetsGroupPropertyName];

                 

                if ([name isEqualToString:@"相册名字"])

                {

                    haveHDRGroup = YES;

                }

            }

             

            if (!haveHDRGroup)

            {

                //do add a group named "XXXX"

                [assetsLibrary addAssetsGroupAlbumWithName:@"相册名字"

                                               resultBlock:^(ALAssetsGroup *group)

                 {

                     [groups addObject:group];

                      

                 }

                                              failureBlock:nil];

                haveHDRGroup = YES;

            }

        }

         

    };

    //创建相簿

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

     

    [self saveToAlbumWithMetadata:nil imageData:UIImagePNGRepresentation(self.imageView.image) customAlbumName:@"相册名字" completionBlock:^

     {

         //这里可以创建添加成功的方法

          

     }

      failureBlock:^(NSError *error)

     {

         //处理添加失败的方法显示alert让它回到主线程执行,不然那个框框死活不肯弹出来

         dispatch_async(dispatch_get_main_queue(), ^{

              

             //添加失败一般是由用户不允许应用访问相册造成的,这边可以取出这种情况加以判断一下

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

                  

                 UIAlertView *alert=[[UIAlertView alloc]initWithTitle:error.localizedDescription message:error.localizedFailureReason delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", nil) otherButtonTitles: nil];

                  

                 [alert show];

                 [alert release];

                 

                  }

         });

     }];

}

 

- (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();

            }

        }

    }];

}

 

 

三、ALAssetsLibraryALAssetsGroup、ALAsset 介绍

 

1、ALAssetsLibrary

ALAssetsLibrary提供了我们对iOS设备中的相片、视频的访问。它是连接了我们应用程序和相册之间的访问的一个桥梁。

 

 

2、ALAssetsGroup

指代一个相册。

 

3、ALAsset

每一个ALAsset代表一个单一资源文件(也就是一张图片,或者一个视频文件)

 

4、ALAssetRepresentation

ALAssetRepresentation封装了ALAsset,包含了一个资源文件中的很多属性。(可以说是ALAsset的不同的表示方式,本质上都表示同一个资源文件)


 


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