Don't have the pictures from directory on CollectionView

问题

I would want to show all the pictures in my directory however I am creating Folders in the Directory so that I can sort the pictures. I want to show all of the pictures in several folders. I am using the code

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    allImagesArray = [[NSMutableArray alloc] init];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *location=@"Bottoms"@"Top"@"Right"@"Left"@"Down"@"Up";
    NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
    NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
    collectionTrash.delegate =self;
    collectionTrash.dataSource=self;
    for(NSString *str in directoryContent){
        NSLog(@"i");
        NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
        NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
        if(data)
        {
            UIImage *image = [UIImage imageWithData:data];
            [allImagesArray addObject:image];
            NSLog(@"array:%@",[allImagesArray description]);
        }}}

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    NSLog(@"j");
    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return [allImagesArray count];


}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *reuseID = @"ReuseID";
    TrashCell *mycell = (TrashCell *) [collectionView dequeueReusableCellWithReuseIdentifier:reuseID forIndexPath:indexPath];
    UIImageView *imageInCell = (UIImageView*)[mycell viewWithTag:1];
    imageInCell.image = [allImagesArray objectAtIndex:indexPath.row];
    NSLog(@"a");
    return mycell;
}

If you see my code you can notice that I have put NSLOG i and j. The j comes up but the i does not.... Is my way wrong showing all the pictures that are in several folders? I do not have any error.

回答1:

If you have multiple folders then you need to iterate over the folders and then the folder contents to process all of it.

While this line:

NSString *location=@"Bottoms"@"Top"@"Right"@"Left"@"Down"@"Up";

Is technically legal, I guess you're thinking it will do some array / iteration thing for you. It won't. It just concatenates all of the strings together. You probably want something more like:

NSArray *locations = @[ @"Bottoms", @"Top", @"Right", @"Left", @"Down", @"Up" ];

Then you can run a loop over the folders and then the contents:

for(NSString *folder in locations) {

    // get the folder contents 

    for(NSString *file in directoryContent) {

        // load the image

    }
}

来源：https://stackoverflow.com/questions/18420655/dont-have-the-pictures-from-directory-on-collectionview

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ios