保存到目录并在UICollection中显示不起作用

Question

我试图让用户保存到目录并在UICollectionView上显示它。这是我保存图片的代码。它正在保存UIView中的图像，因为在用户拍摄了UIImage中显示的照片之后。

- (void) processImage:(UIImage *)image { //process captured image, crop, resize and rotate
    haveImage = YES;

    if([UIDevice currentDevice].userInterfaceIdiom==UIUserInterfaceIdiomPad) { //Device is ipad
        // Resize image
        UIGraphicsBeginImageContext(CGSizeMake(768, 1022));
        [image drawInRect: CGRectMake(0, 0, 768, 1022)];
        UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        CGRect cropRect = CGRectMake(0, 130, 768, 768);
        CGImageRef imageRef = CGImageCreateWithImageInRect([smallImage CGImage], cropRect);
        //or use the UIImage wherever you like

        [captureImage setImage:[UIImage imageWithCGImage:imageRef]];

        CGImageRelease(imageRef);



    }else{ //Device is iphone
        // Resize image
        UIGraphicsBeginImageContext(CGSizeMake(320, 426));
        [image drawInRect: CGRectMake(0, 0, 320, 426)];
        UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        CGRect cropRect = CGRectMake(0, 55, 320, 320);
        CGImageRef imageRef = CGImageCreateWithImageInRect([smallImage CGImage], cropRect);

        [captureImage setImage:[UIImage imageWithCGImage:imageRef]];

        CGImageRelease(imageRef);

        NSArray *directoryNames = [NSArray arrayWithObjects:@"hats",@"bottoms",@"right",@"left",nil];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder

        for (int i = 0; i < [directoryNames count] ; i++) {
            NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:[directoryNames objectAtIndex:i]];
            if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
                [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:nil]; //Create folder

            NSString *folderPath = [documentsDirectory stringByAppendingPathComponent:@"hats"]; // "right" is at index 2, per comments & code
            NSString *filePath = [folderPath stringByAppendingPathComponent:@"IMAGE_NAME_HERE.PNG"]; // you maybe want to incorporate a timestamp into the name to avoid duplicates
            NSData *imageData = UIImagePNGRepresentation(captureImage.image);
            [imageData writeToFile:filePath atomically:YES];
        }
    }

这是我的UIController View代码，以便我可以检索用户已经拍摄的图像。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSMutableArray *allImagesArray = [[NSMutableArray alloc] init];
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *location=@"Hats";
    NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
    NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
    for(NSString *str in directoryContent){
        NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
        NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
        if(data)
        {
            UIImage *image = [UIImage imageWithData:data];
            [allImagesArray addObject:image];
        }}}

对于这段代码，我收到警告说“allImageArray”的本地声明隐藏了实例变量。这是问题吗？我不知道应该在哪里修复并完全停留2周，找到如何保存到目录并在UICollectionView中显示。如果你想看到更多我的代码随时问我。非常感谢任何帮助。