iOS 开发: 自定义相册, 保存多张图片到自定义相册中

1、自定义相册(兼容 iOS7 iOS8)

• - (void)viewDidLoad {
  //search all photo albums in the library
      [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:^(ALAssetsGroup *group, BOOL *stop)
       {
           //compare the names of the albums
           if ([@"九哒" compare: [group valueForProperty:ALAssetsGroupPropertyName]]==NSOrderedSame) {
               //target album is found
               _isHaveAlbum = YES;
               return;
           }
           if (group==nil && _isHaveAlbum == NO) {
               //photo albums are over, target album does not exist, thus create it
               //__weak ALAssetsLibrary* weakSelf = assetsLibrary;
               
               if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
                   // iOS 8 code
                   // Create new album.
                   [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                       [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"九哒"];
                   } completionHandler:^(BOOL success, NSError *error) {
                       if (!success) {
                           NSLog(@"Error creating album: %@", error);
                       }
                   }];
               }
               else {
                   // iOS 7.x code
                   //create new assets album
                   [assetsLibrary addAssetsGroupAlbumWithName:@"九哒" resultBlock:nil failureBlock: nil];
               }
               //should be the last iteration anyway, but just in case
               _isHaveAlbum = YES;
               return;
           }
       } failureBlock: nil];
  }

  具体的解释我已经在上一篇博文(http://www.cnblogs.com/cai-rd/p/4432908.html)中解释, 这里就不多解释了, 上面代码需要补充一个变量 isHaveAblum = NO;

2、把多张照片存入自定义的相册中

• for(int i = 0; i < 9; i++){
  // 利用延时每隔0.1秒存入 一次
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1*i * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                          [self saveImage:yourImage toAlbum:@"Rd" withCompletionBlock:^{
                              NSLog(@"save s img success");
                          }];
  });
  
  }

  /**
   *  保存图片到相册中
   *
   *  @param image           <#image description#>
   *  @param albumName       <#albumName description#>
   *  @param completionBlock <#completionBlock description#>
   */
  -(void)saveImage:(UIImage*)image toAlbum:(NSString*)albumName withCompletionBlock:(void (^)(void))completionBlock
  {
      ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
      //write the image data to the assets library (camera roll)
      [assetsLibrary writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation completionBlock:^(NSURL* assetURL, NSError* error)
      {
          //error handling
          if (error!=nil) {
              //completionBlock(error);
              return;
          }
          //add the asset to the custom photo album
          [self addAssetURL: assetURL toAlbum:albumName withCompletionBlock:completionBlock];
      }];
  }
  
  -(void)addAssetURL:(NSURL*)assetURL toAlbum:(NSString*)albumName withCompletionBlock:(void (^)(void))completionBlock
  {
      
      ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
  
      __block BOOL albumWasFound = NO;
      
      //search all photo albums in the library
      [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:^(ALAssetsGroup *group, BOOL *stop)
      {
          //compare the names of the albums
          if ([albumName compare: [group valueForProperty:ALAssetsGroupPropertyName]]==NSOrderedSame) {
              //target album is found
              albumWasFound = YES;
                 
              //get a hold of the photo's asset instance
              [assetsLibrary assetForURL: assetURL resultBlock:^(ALAsset *asset)
               {
                   //add photo to the target album
                   [group addAsset: asset];
                            
                   //run the completion block
                   completionBlock();
               } failureBlock: nil];
                 
              //album was found, bail out of the method
              return;
          }
             
          if (group==nil && albumWasFound==NO) {
              //photo albums are over, target album does not exist, thus create it
              __weak ALAssetsLibrary* weakSelf = assetsLibrary;
              
              if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
                  // iOS 8 code
                  // Create new album.
                  [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                      [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"九哒"];
                  } completionHandler:^(BOOL success, NSError *error) {
                      if (!success) {
                          NSLog(@"Error creating album: %@", error);
                      }
                  }];
              }
              else {
                  // iOS 7.x code
                  //create new assets album
                  [assetsLibrary addAssetsGroupAlbumWithName:albumName resultBlock:^(ALAssetsGroup *group)
                   {
                       //get the photo's instance
                       [weakSelf assetForURL: assetURL resultBlock:^(ALAsset *asset)
                        {
                            //add photo to the newly created album
                            [group addAsset: asset];
                            
                            //call the completion block
                            completionBlock();
                        } failureBlock: nil];
                   } failureBlock: nil];
                  albumWasFound = YES;
              }
              
              //should be the last iteration anyway, but just in case
              return;
          }
      } failureBlock: nil];
  }

3、需要引入的头文件

• #import <AssetsLibrary/ALAsset.h>
  #import <AssetsLibrary/ALAssetsLibrary.h>
  #import <AssetsLibrary/ALAssetsGroup.h>
  #import <AssetsLibrary/ALAssetRepresentation.h>
  #import <Photos/Photos.h>

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