Question

（首先，我是开发新手）我正在玩一个Treehouse Learning演示代码和我昨晚在互联网上找到的scrolllingTableView代码，并且能够将两个代码集成在一起，让一切正常工作。然后我错误地用我以前的版本保存了我的项目，并且无法让它重新恢复工作。我已经把它恢复到它接收来自Parse的消息，但没有以缩略图形式在scrollingTableView上显示它们，当我点击消息时我没有被带到detailViewController，就像我设置了我的segue一样。如果有人知道我这次出错的地方请给我一个抬头！干杯！

@interface AlbumsViewController ()<PPImageScrollingTableViewCellDelegate>
@property (strong, nonatomic) NSArray *images;

@end

@implementation AlbumsViewController

    - (void)viewDidLoad
{
    [super viewDidLoad];

    self.title = @"Albums";
    [self.tableView setBackgroundColor:[UIColor grayColor]];

    self.moviePlayer = [[MPMoviePlayerController alloc] init];
}

- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];

PFQuery *query = [PFQuery queryWithClassName:@"Messages"];
[query whereKey:@"recipientIds" equalTo:[[PFUser currentUser] objectId]];
[query orderByDescending:@"createdAt"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (error) {
        NSLog(@"Error: %@ %@", error, [error userInfo]);
    }
    else {
        // We found messages!
        self.messages = objects;
        [self.tableView reloadData];
        NSLog(@"Retrieved %d messages", [self.messages count]);
    }
}];
}
pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.messages count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
PPImageScrollingTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    PFObject *message = [self.messages objectAtIndex:indexPath.row];
    cell.textLabel.text = [message objectForKey:@"senderName"];

    NSString *fileType = [message objectForKey:@"fileType"];
    if ([fileType isEqualToString:@"image"]) {
    cell.imageView.image = [UIImage imageNamed:@"icon_image"];
    NSLog(@"it's an image");
    }
else {
    cell.imageView.image = [UIImage imageNamed:@"icon_video"];
    NSLog(@"it's a video");
}
    return cell;
}  
pragma mark - UITableViewDelegate
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 150;
}
pragma mark - PPImageScrollingTableViewCellDelegate
- (void)scrollingTableViewCell:(PPImageScrollingTableViewCell *)scrollingTableViewCell didSelectImageAtIndexPath:(NSIndexPath*)indexPathOfImage atCategoryRowIndex:(NSInteger)categoryRowIndex
{
self.selectedMessage = [self.messages objectAtIndex:categoryRowIndex];
NSString *fileType = [self.selectedMessage objectForKey:@"fileType"];
if ([fileType isEqualToString:@"image"]) {
    [self performSegueWithIdentifier:@"showDetail" sender:self];
    }
else {
    // File type is video
    PFFile *videoFile = [self.selectedMessage objectForKey:@"file"];
    NSURL *fileUrl = [NSURL URLWithString:videoFile.url];
    self.moviePlayer.contentURL = fileUrl;
    [self.moviePlayer prepareToPlay];
    [self.moviePlayer thumbnailImageAtTime:0 timeOption:MPMovieTimeOptionNearestKeyFrame];

    // Add it to the view controller so we can see it
    [self.view addSubview:self.moviePlayer.view];
    [self.moviePlayer setFullscreen:YES animated:YES];
}
    [self.selectedMessage saveInBackground];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:@"showDetail"]) {
    [segue.destinationViewController setHidesBottomBarWhenPushed:YES];
    DetailViewController *imageViewController = (DetailViewController *)segue.destinationViewController;
    imageViewController.message = self.selectedMessage;
}
}
@end

Answer 1

有关单元格选择的问题，您需要调用

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
          PFObject *object = [images objectAtIndex:indexPath.row]; 
}

在滚动表视图中显示图片不起作用

1 个答案: