在NSDocumentDirectory中删除图像

Question

我有一个定制库，可以从相机胶卷中选取多张图像，我将图像保存在NSDocumentDirectory中，如下所示：

         for (int i = 0; i < info.count; i++) {
            NSLog(@"%@", [info objectAtIndex:i]);
            NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,    NSUserDomainMask ,YES );
            NSString *documentsDir = [paths objectAtIndex:0];
            NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:@"Images%d.png", i]];
            ALAssetRepresentation *rep = [[info objectAtIndex: i] defaultRepresentation];
            UIImage *image = [UIImage imageWithCGImage:[rep fullResolutionImage]];
            //----resize the images
            image = [self imageByScalingAndCroppingForSize:image toSize:CGSizeMake(256,256*image.size.height/image.size.width)];

            NSData *imageData = UIImagePNGRepresentation(image);
            [imageData writeToFile:savedImagePath atomically:YES];

            NSLog(@"saving at:%@",savedImagePath);

        }

我想做的是，我想用UIScrollView加载一个缩略图，然后当一个特定的图片被点击时，会弹出一个AlertView，它会询问用户是否要删除它。我设法让它加载到缩略图视图中(我使用HSImageSidebarView)，并在用户点击图像时使AlertVIew弹出窗口。但当我按delete时，它会在视图中删除，但不会在NSDocumentDirectory中删除。

这就是我如何删除我的镜像：

- (void)sidebar:(HSImageSidebarView *)sidebar didRemoveImageAtIndex:(NSUInteger)anIndex {
    NSLog(@"Image at index %d removed", anIndex);
    [images removeObjectAtIndex:anIndex];

    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"Images%d.png", anIndex]];
    [fileManager removeItemAtPath: fullPath error:NULL];
    NSLog(@"image removed");
}

Answer 1

在此行上，将%d替换为%lu

NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"Images%d.png", anIndex]];