0

在我的代码中，我尝试从照片库中获取所有照片并将它们存储在一个数组中。我什至想获取视频并将它们存储在同一个数组中。请告诉我如何根据上述要求修改此代码。由于我是新手，几个月以来我一直在为此苦苦挣扎。

-(IBAction)getAllPictures: (id) sender
{
    imageArray=[[NSArray alloc] init];
    mutableArray =[[NSMutableArray alloc]init];
    NSMutableArray* assetURLDictionaries = [[NSMutableArray alloc] init];

    library = [[ALAssetsLibrary alloc] init];

    void (^assetEnumerator)( ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop)
    {
        if(result != nil)
        {
            if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto])
            {
                if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeVideo])
                {

                  if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeUnknown])
                  {
                    [assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]];

                    NSURL *url= (NSURL*) [[result defaultRepresentation]url];

                    [library assetForURL:url
                     resultBlock:^(ALAsset *asset)
                     {
                         [mutableArray addObject:[UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage]]];

                         if ([mutableArray count]==count)
                         {
                             imageArray=[[NSArray alloc] initWithArray:mutableArray];
                             [self allPhotosCollected:imageArray];
                         }
                     }
                    failureBlock:^(NSError *error){ NSLog(@"operation was not successfull!");
                    } ];

        }
    }
}
}
};

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

void (^ assetGroupEnumerator) ( ALAssetsGroup *, BOOL *)= ^(ALAssetsGroup *group, BOOL *stop)
{
    if(group != nil)
    {
        [group enumerateAssetsUsingBlock:assetEnumerator];
        [assetGroups addObject:group];
        count=[group numberOfAssets];
    }
};

assetGroups = [[NSMutableArray alloc] init];

[library enumerateGroupsWithTypes:ALAssetsGroupAll
                       usingBlock:assetGroupEnumerator
                     failureBlock:^(NSError *error)
{
    NSLog(@"There is an error");
}];
}

-(void)allPhotosCollected:(NSArray*)imgArray
{
//write your code here after getting all the photos from library...
    NSLog(@"all pictures are %@",imgArray);
}
4

2 回答 2

1

你必须使用assetLibraries试试这个代码： -

我从照片库中获取所有照片的代码

- (void)viewDidLoad
{
    carousel.type = iCarouselTypeCoverFlow2;
    [super viewDidLoad];
    xy =[[NSMutableArray alloc]init];

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

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

    void (^assetEnumerator)( ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
        if(result != nil) {
            if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {
                [assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]];

                NSLog(@"result is:%@",result);
                NSLog(@"asset URLDictionary is:%@",assetURLDictionaries);
                NSURL *url= (NSURL*) [[result defaultRepresentation]url]; 

                [library assetForURL:url
                         resultBlock:^(ALAsset *asset) {
                             [xy addObject:[UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage]]];
                             NSLog(@" xy is:%@",xy);
                             image =[ [UIImageView alloc ] initWithImage:[xy objectAtIndex:0]];
                             NSLog(@"image is:%@",image);
                         }
                         failureBlock:^(NSError *error){ NSLog(@"test:Fail"); } ]; 
            } 
        }
    };

    NSMutableArray *assetGroups = [[NSMutableArray alloc] init];
    void (^ assetGroupEnumerator) ( ALAssetsGroup *, BOOL *)= ^(ALAssetsGroup *group, BOOL *stop) {
        NSLog(@"hello");
        if(group != nil) {
            [group enumerateAssetsUsingBlock:assetEnumerator];
            [assetGroups addObject:group];
            NSLog(@"Number of assets in group :%d",[group numberOfAssets]);
            NSLog(@"asset group is:%@",assetGroups);
        }
    };

    assetGroups = [[NSMutableArray alloc] init];

    [library enumerateGroupsWithTypes:ALAssetsGroupAll
             usingBlock:assetGroupEnumerator
             failureBlock:^(NSError *error) {NSLog(@"A problem occurred");}];
}

我从库中获取所有视频的代码

- (void)updateAssetsLibrary
{
loadImgView.hidden = NO;
[spinner startAnimating];
//selectVideoBtn .userInteractionEnabled = NO;

assetItems = [NSMutableArray arrayWithCapacity:0];
ALAssetsLibrary *assetLibrary = assetsLibrary;

[assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) 
{
    if (group)
    {
        [group setAssetsFilter:[ALAssetsFilter allVideos]];
        [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
        {
             if (asset)
             {
                 dic = [[NSMutableDictionary alloc] init];
                 ALAssetRepresentation *defaultRepresentation = [asset defaultRepresentation];
                 NSString *uti = [defaultRepresentation UTI];
                 appDelegate.videoURL = [[asset valueForProperty:ALAssetPropertyURLs] valueForKey:uti];

                 mpVideoPlayer = [[MPMoviePlayerController alloc] initWithContentURL:appDelegate.videoURL];

                 NSString *title = [NSString stringWithFormat:@"%@ %i", NSLocalizedString(@"Video", nil), [assetItems count]+1];

                 [self performSelector:@selector(imageFromVideoURL)];
                 [dic setValue:title forKey:kName];
                 [dic setValue:appDelegate.videoURL forKey:kURL];

                 AssetBrowserItem *item = [[AssetBrowserItem alloc] initWithURL:appDelegate.videoURL title:title];
                 [assetItems addObject:item];
                 [appDelegate.videoURLArray addObject:dic];

                 NSLog(@"Video has info:%@",appDelegate.videoURLArray);
             }
             NSLog(@"Values of dictionary==>%@", dic);

             //NSLog(@"assetItems:%@",assetItems);
             NSLog(@"Videos Are:%@",appDelegate.videoURLArray);
        } ];
    }
    // group == nil signals we are done iterating.
    else 
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            //[self updateBrowserItemsAndSignalDelegate:assetItems];
            loadImgView.hidden = NO;
            [spinner stopAnimating];
            [loadImgView removeFromSuperview];
            //selectVideoBtn .userInteractionEnabled = YES;
        });
    }
}
failureBlock:^(NSError *error) 
{
    NSLog(@"error enumerating AssetLibrary groups %@\n", error);
}];
}

- (UIImage *)imageFromVideoURL 
{
// result 
UIImage *image = nil;

// AVAssetImageGenerator
AVAsset *asset = [[AVURLAsset alloc] initWithURL:appDelegate.videoURL options:nil];; 
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
imageGenerator.appliesPreferredTrackTransform = YES;

// calc midpoint time of video
Float64 durationSeconds = CMTimeGetSeconds([asset duration]);
CMTime midpoint = CMTimeMakeWithSeconds(durationSeconds/2.0, 600); 

// get the image from 
NSError *error = nil; 
CMTime actualTime;
CGImageRef halfWayImage = [imageGenerator copyCGImageAtTime:midpoint actualTime:&actualTime error:&error];

if (halfWayImage != NULL) 
{
    // CGImage to UIImage
    image = [[UIImage alloc] initWithCGImage:halfWayImage];
    [dic setValue:image forKey:kImage];
    NSLog(@"Values of dictionary==>%@", dic);
    NSLog(@"Videos Are:%@",appDelegate.videoURLArray);
    CGImageRelease(halfWayImage);
}
return image;
}

- (void)assetsLibraryDidChange:(NSNotification*)changeNotification
{
[self updateAssetsLibrary];
}

- (void)buildAssetsLibrary
{
assetsLibrary = [[ALAssetsLibrary alloc] init];
ALAssetsLibrary *notificationSender = nil;

NSString *minimumSystemVersion = @"4.1";
NSString *systemVersion = [[UIDevice currentDevice] systemVersion];
if ([systemVersion compare:minimumSystemVersion options:NSNumericSearch] != NSOrderedAscending)
    notificationSender = assetsLibrary;

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(assetsLibraryDidChange:) name:ALAssetsLibraryChangedNotification object:notificationSender];
[self updateAssetsLibrary];
}

此代码将为您提供 iPhone 的视频列表。

它可以帮助你:)

供将来参考使用：-

于 2013-10-19T07:25:51.883 回答
0

试试这个答案非常简单易懂

-(void)getFromGallery:(BOOL )IsImages
{
    if(self.csCollectionsArray != nil)
        [self.csCollectionsArray removeAllObjects];
    __block NSMutableDictionary *date = [[NSMutableDictionary alloc] init];
    ALAssetsLibrary *csAssetsLibrary = [[ALAssetsLibrary alloc] init];
    NSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent | ALAssetsGroupFaces | ALAssetsGroupSavedPhotos;
    [csAssetsLibrary enumerateGroupsWithTypes:groupTypes usingBlock:^(ALAssetsGroup *group, BOOL *stop)
    {
        if([group numberOfAssets] > 0)
        {
            if(IsImages)
                [group setAssetsFilter:[ALAssetsFilter allPhotos]];
            else
                [group setAssetsFilter:[ALAssetsFilter allVideos]];
            [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
            {
                if(asset)
                { //1.fetching all assets from device library
                    //2.Add all fetched assests from library
                    [date setObject:asset forKey:[asset valueForProperty:ALAssetPropertyDate]];
                }
            }];
        }
        else
        { NSLog(@"---> load table -------->");
            if(date != nil && date.count > 0)
            { //3.Sort using date by ascending order and moved to dictionary to array
                NSArray *sortedKeys = [[date allKeys] sortedArrayUsingSelector: @selector(compare:)];
                for (NSString *key in sortedKeys)
                    [self.csCollectionsArray addObject: [date objectForKey:key]];
                //4.Load images into collection view after fetching all datas
                [self reloadCollectionView];
                if(self.csCollectionView != nil)
                    [self.csCollectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:([self.csCollectionsArray count] - 1) inSection:0] atScrollPosition:UICollectionViewScrollPositionBottom animated:YES];
            }
            date = nil;
        }
    }failureBlock:^(NSError *error)
    {
        if((csCollectionsArray == nil || [csCollectionsArray count] == 0))
        {
            ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus]; if(status != ALAuthorizationStatusAuthorized)
            {
                [self showAlertAndCloseUploaderView:@"You can just go to \"Settings\" app (General -> Reset -> Reset Location & Privacy) then come again and click ok when the alert dialog is showing for enable the permission to access the photo library"];
            }
        }
    }];
}

于 2015-05-27T10:51:44.710 回答