parse.com tableview不加載對象

Question

我想從parse.com加載我的表視圖中的數據，但表視圖加載但沒有數據。類名是@「Exibitor」，但沒有加載。

@interface DMKViewControllerExhibitors() 

@end 

@implementation DMKViewControllerExhibitors 



- (id)initWithCoder:(NSCoder *)aCoder { 
self = [super initWithCoder:aCoder]; 
if (self) { 
    // Customize the table 

    // The className to query on 
    self.parseClassName = @"Exibitor"; 

    // The key of the PFObject to display in the label of the default cell style 
    self.textKey = @"objectid"; 

    // Uncomment the following line to specify the key of a PFFile on the PFObject to display in the imageView of the default cell style 
    // self.imageKey = @"image"; 

    // Whether the built-in pull-to-refresh is enabled 
    self.pullToRefreshEnabled = YES; 

    // Whether the built-in pagination is enabled 
    self.paginationEnabled = YES; 

    // The number of objects to show per page 
    self.objectsPerPage = 25; 

} 
return self; 

} 

#pragma mark - View lifecycle 

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 

// Uncomment the following line to preserve selection between presentations. 
// self.clearsSelectionOnViewWillAppear = NO; 

// Uncomment the following line to display an Edit button in the navigation bar for this view controller. 
// self.navigationItem.rightBarButtonItem = self.editButtonItem; 
} 

- (void)viewDidUnload 
{ 
[super viewDidUnload]; 
// Release any retained subviews of the main view. 
// e.g. self.myOutlet = nil; 
} 

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

- (void)viewDidAppear:(BOOL)animated 
{ 
[super viewDidAppear:animated]; 
[super viewDidAppear:animated]; 
self.canDisplayBannerAds = YES; 

#pragma mark - Parse 

- (void)objectsDidLoad:(NSError *)error { 
[super objectsDidLoad:error]; 

// This method is called every time objects are loaded from Parse via the PFQuery 
} 

- (void)objectsWillLoad { 
[super objectsWillLoad]; 

// This method is called before a PFQuery is fired to get more objects 
} 


// Override to customize what kind of query to perform on the class. The default is to  query for 
// all objects ordered by createdAt descending. 
- (PFQuery *)queryForTable { 
PFQuery *query = [PFQuery queryWithClassName:self.parseClassName]; 

// 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:@"name"]; 


return query; 
} 



// Override to customize the look of a cell representing an object. The default is to display 
// a UITableViewCellStyleDefault style cell with the label being the first key in the object. 
- (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:@"text"]; 
cell.detailTextLabel.text = [NSString stringWithFormat:@"name: %@", [object objectForKey:@"name"]]; 

return cell; 
} 

我是新來解析，不能真正看到它爲什麼不加載。 我需要它按降序列出所有名稱。

我現在已經把這個ini和它拋出一個錯誤

*終止應用程序由於未捕獲的異常「NSInternalInconsistencyException」，理由是：「這個查詢有一個優秀的網絡連接。你必須等到它完成。「 *第一擲調用堆棧：

- (PFQuery *)queryForTable { 
PFQuery *query = [PFQuery queryWithClassName:@"Exibitor"]; 

[query whereKey:@"Trade" equalTo:@"True"]; 
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) { 
    if (!error) { 
     // The find succeeded. 
     NSLog(@"Successfully retrieved %lu scores.", (unsigned long)objects.count); 
     // Do something with the found objects 
     for (PFObject *object in objects) { 
      NSLog(@"%@", object.objectId); 
     } 
    } else { 
     // Log details of the failure 
     NSLog(@"Error: %@ %@", error, [error userInfo]); 
    } 
}]; return query; 
} 

Answer 1

也許你只是錯過了粘貼在此代碼到這個問題，但查詢需要執行。的地方，我們需要做到這一點...

PFQuery *query = [self queryForTable]; 
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) { 
    if (!error) { 
     // have your tableView reloadData (you need an outlet to do this) 
    } else { 
     // Log details of the failure 
     NSLog(@"%@", error); 
    } 
}]; 

Answer 2

這是我的編碼的作品，我不理解您的設置正是你的應用程序，但也許你可以從拿東西的副本我編碼並解決你的問題，祝你好運！

- (PFQuery *)queryForTable 
{ 
    PFQuery *query = [PFQuery queryWithClassName:self.parseClassName]; 

    query.cachePolicy = kPFCachePolicyCacheThenNetwork; 

    if (self.canSearch == 0) { 
     query = [PFQuery queryWithClassName:self.parseClassName]; 
    } else { 
     query = [PFQuery queryWithClassName:self.parseClassName]; 

     NSString *searchThis = [searchedBar.text lowercaseString]; 
     [query whereKey:@"Position" containsString:searchThis]; 
    } 

    [query orderByAscending:@"Position"]; 

    // If Pull To Refresh is enabled, query against the network by default. 
    if (self.pullToRefreshEnabled) { 
     query.cachePolicy = kPFCachePolicyNetworkOnly; 
    } 

    // 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; 
    } 
    return query; 
}