设备中创建新相册（粘贴）

Posted 2020-06-18 jianbo_iOS

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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1	#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、ALAssetsLibrary、ALAssetsGroup、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）