Question

我正在创建一个应用程序，我将我的注册用户可视化到Parse.com的数据管理器（在TableView控制器中），并将所选单元的步骤数据转换为新的视图控制器。

我的问题是我无法在新的视图控制器中查看图像，你可以告诉我该怎么办？我试图在各种论坛上理解和调查argormento，但在论坛上找不到答案，而且Parse已经很长时间了，因为我没有回答。

这是我正在处理的代码：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
    {        if ([segue.identifier isEqualToString:@"Visual"]){

           NSIndexPath *indexPath = [self.Tork indexPathForSelectedRow];
           PFObject *object = [self.objects objectAtIndex:indexPath.row];
           ViewController  *detailViewController = [segue destinationViewController];
           detailViewController.oggetto = object;  } }

TableView：

- (PFQuery *)queryForTable {
    PFQuery *query = [PFQuery queryWithClassName:@"_User"];
    [query whereKeyExists:@"username"];
    [query whereKeyExists:@"picture"];
    [query whereKeyExists:@"email"];

    // If no objects are loaded in memory, we look to the cache first to fill the table
    // and then subsequently do a query against the network.
    if ([self.objects count] == 0) {
        query.cachePolicy = kPFCachePolicyCacheThenNetwork; }

    [query orderByAscending:@"username"];        
    return query;    }




- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }

    // Configure the cell
    cell.textLabel.text = [object objectForKey:@"username"];
    cell.detailTextLabel.text =  [object objectForKey:@"email"]];
   cell.imageView.image = [UIImage imageNamed:@"none.png"];


    PFFile *file = [object objectForKey:@"picture"];
    [file getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
        cell.imageView.image =[UIImage imageWithData:data];

    }];

    return cell;
}

Answer 1

感谢您的回复:) ...问题似乎已经解决了..我改变了以下内容为此做准备，它现在正常运作！你怎么看？你觉得合适吗？直到现在还没有导致我的应用程序崩溃。

PfQueryTableViewController.m

    - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"Visual"]){

        NSIndexPath *indexPath = [self.tavola indexPathForSelectedRow];
        PFObject *object = [self.objects objectAtIndex:indexPath.row];
        PFFile *file = [self.objects objectAtIndex:indexPath.row ];

        ViewController  *detailViewController = [segue destinationViewController];
        detailViewController.oggetto = object;
        detailViewController.file = file;
    }
}

DetailViewcontroller.m

 - (void)viewDidLoad
{
    [super viewDidLoad];
    self.nome.text = [oggetto objectForKey:@"username"];
    self.email.text = [oggetto objectForKey:@"email"];

    PFFile *imageFile = [oggetto objectForKey:@"foto"];
    [imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
        self.image.image =[UIImage imageWithData:data];                       
    }];   
}

现在我遇到了这段代码的麻烦，我在显示器上添加了一个搜索栏。代码不返回任何错误，但在开始搜索时没有显示任何结果。这是代码，你有想法吗？

- (void)callbackLoadObjectsFromParse:(NSArray *)result error:(NSError *)error {
    if (!error) {
        NSLog(@"Successfully fetched %d entries", result.count);

         [self.searchResults addObjectsFromArray: result];

    } else {
        NSLog(@"Error: %@ %@", error, [error userInfo]);
    }

}

- (void)filterResults:(NSString *)searchTerm {

    [self.searchResults removeAllObjects];

    PFQuery *query = [PFQuery queryWithClassName: @"_User"];
    [query whereKeyExists:@"username"];  //this is based on whatever query you are trying to accomplish
    [query whereKeyExists:@"foto"]; //this is based on whatever query you are trying to accomplish
    [query whereKeyExists:@"email"];
    query.cachePolicy = kPFCachePolicyNetworkOnly;
    query.limit = 50;
    [query findObjectsInBackgroundWithTarget:self selector:@selector(callbackLoadObjectsFromParse:error:)];


}


- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:  (NSString *)searchString {
    [self filterResults:searchString];
    return YES;
}

日志告诉我这个，但我没有在设备上显示结果：（

AssertMacros：queueEntry，file：/ SourceCache / IOKitUser / IOKitUser-920.1.11 / hid.subproj / IOHIDEventQueue.c，line：512 09/13/2013 01：34：50.537 Unipot v.02 [412：60 b]成功获取9个条目

传递图像数据

1 个答案: