UITableView無法正常工作

Question

我試圖在UIViewController中創建一個註釋UITableView，但我遇到了問題。如果我直接設置文本，它顯示了（cell.username.text），但如果我試圖用PFQuery（parse.com）沒有填滿它顯示了

//DetailViewController.h  
    #import <UIKit/UIKit.h> 
    #import <Parse/Parse.h> 

    @interface DetailViewController : UIViewController{ 

    } 

    @property (strong, nonatomic) PFObject *place; 
    @property (strong, nonatomic) IBOutlet PFImageView *userPhoto; 
    @property (strong, nonatomic) IBOutlet UILabel *username; 
    @property (strong, nonatomic) IBOutlet UILabel *message; 
    @property (strong, nonatomic) IBOutlet UILabel *distance; 
    @property (strong, nonatomic) IBOutlet UILabel *checkCount; 
    @property (strong, nonatomic) IBOutlet PFImageView *photo; 
    @property (strong, nonatomic) IBOutlet UIScrollView *scroller; 
    @property (strong, nonatomic) IBOutlet UITableView *commentsTableView; 

    - (IBAction)checkMarkButton:(UIButton *)sender; 


    @end 

//DetailViewController.m 
#import "DetailViewController.h" 
#import "CommentsViewController.h" 

@interface DetailViewController(){ 

    CommentsViewController *test; 
} 

@end 

@implementation DetailViewController 

@synthesize place; 
@synthesize userPhoto, message, username, checkCount, photo, scroller, commentsTableView; 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 

    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 

    test = [[CommentsViewController alloc] init]; 
    self.commentsTableView.delegate = test; 
    self.commentsTableView.dataSource = test; 

    [test commentsQuery:place]; 
} 

//CommentsViewController.h 
#import <Parse/Parse.h> 

@interface CommentsViewController : UITableViewController{ 

} 

@property (strong, nonatomic) PFObject *place; 

- (void)commentsQuery:(PFObject *)object; 

@end 

//CommentsViewController.m 
#import "CommentsViewController.h" 
#import "DetailViewController.h" 
#import "CommentsCell.h" 

@interface CommentsViewController(){ 
    NSArray *commentsArray; 
} 



@end 

@implementation CommentsViewController 

@synthesize place; 



- (void)commentsQuery:(PFObject *)object { 

    place = object; 

    PFQuery *query1 = [PFQuery queryWithClassName:@"activity"]; 
    [query1 whereKey:@"type" equalTo:@"comment"]; 
    [query1 whereKey:@"place" equalTo:place]; 
    [query1 orderByDescending:@"createdAt"]; 
    [query1 findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) { 
     if (!error){ 
      commentsArray = [[NSArray alloc]initWithArray:objects]; 
      NSLog(@"%lu", (unsigned long)[commentsArray count]); 
     } 
    }]; 

} 






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


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath; 
{ 
    static NSString *CellIdentifier = @"Cell"; 
    CommentsCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; 
    if (cell == nil) { 
     cell = [[CommentsCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; 
    } 

    PFObject *tempObj = [commentsArray objectAtIndex:indexPath.row]; 

    cell.username.text = @"username"; 
    cell.comment.text = [tempObj objectForKey:@"content"]; 
    cell.userThumbnail.file = [tempObj objectForKey:@"userThumbnail"]; 
    [cell.userThumbnail loadInBackground]; 



    return cell; 
} 
@end 

Answer 1

我的問題是調用reloadData。我跟着這裏的答案，它的工作原理UITableView delegate and datasource in a separate class after parsing