直播app開發搭建，ios 獲取手機中所有圖片

直播app開發搭建，ios 獲取手機中所有圖片

首先我們得匯入相關的庫

#import <AssetsLibrary/AssetsLibrary.h>

程式碼：

photo = [[NSMutableArray alloc]init];
ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
    dispatch_queue_t dispatchQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(dispatchQueue, ^(void){   
            //遍歷所有相簿
            [assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop){   
                [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop){
                    NSString *assetType = [result valueForProperty:ALAssetPropertyType];            
                    NSDictionary *url = [result valueForProperty:ALAssetPropertyURLs];
                    if ([assetType isEqualToString:ALAssetTypePhoto])
                    {
                        [photo addObject:url];
                        NSLog(@"url == %@", url);
                    }
                }];
                dispatch_async(dispatch_get_main_queue(), ^{
                    if (photo != nil)
                    {
                        //我不知道這裡來呼叫會不會有什麼不好
                    }
                    
                });
                
            }
                                      failureBlock:^(NSError *error)
             {
                 NSLog(@"failed");
             }];
    });

這樣我們所有的圖片的url 就放到 photo 這個陣列中了，呼叫的話：

 UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(5, 5, 20, 20)];
      ALAssetsLibrary   *lib = [[ALAssetsLibrary alloc] init] ;
        [lib assetForURL:[[photo objectAtIndex:0] valueForKey:@"public.jpeg"] resultBlock:^(ALAsset *asset)
         {
//這裡可以獲取照片的相關資訊
             ALAssetRepresentation *assetRep = [asset defaultRepresentation];
//獲取縮圖
             CGImageRef imgRef = asset.thumbnail;
             imgView.image = [UIImage imageWithCGImage:imgRef
                                                 scale:assetRep.scale
                                           orientation:(UIImageOrientation)assetRep.orientation];
         }
            failureBlock:^(NSError *error)
         {
             NSLog(@"failed!!");
         }];

 

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