Assertionsfehler in UITableViewController

Nehme ich die iTunes U Stanford iOS Klasse und arbeite an einem der Zuweisungen zu bauen, ein kleines Flickr-app. Ich erhalte eine Fehlermeldung, dass ich nicht scheinen, um in der Lage sein, zu Debuggen, was kommt als

* Assertionsfehler in -[UITableView _configureCellForDisplay:forIndexPath:], /SourceCache/UIKit_Sim/UIKit-2280.1/UITableView.m:5336 2012-08-03
10:59:24.596 Zuordnung 4[4611:c07] (null) libc++abi.dylib: kündigen
genannt, eine Ausnahme zu werfen

Mein code für die tableviewcontroller in Frage:

#import "PlacesPhotosTableViewController.h"

@interface PlacesPhotosTableViewController ()
@property (nonatomic) NSDictionary *placeToDisplay;
@property (nonatomic) NSArray *photosInPlace;
@end

@implementation PlacesPhotosTableViewController
@synthesize placeToDisplay = _placeToDisplay;
@synthesize photosInPlace = _photosInPlace;

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        //Custom initialization
    }
    return self;
}

- (id)init
{
    self = [super init];

    return self;
}

- (id)initWithPlace:(NSDictionary *)place
{
    self = [self init];
    if (self)
    {
        self.placeToDisplay = place;
    }

    return self;
}

- (NSArray *)photosInPlace
{
    if (_photosInPlace == nil)
    {
        _photosInPlace = [FlickrFetcher photosInPlace:self.placeToDisplay maxResults:50];
    }

    return _photosInPlace;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog([self.placeToDisplay valueForKeyPath:@"description._content"]);

    //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)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    //Dispose of any resources that can be recreated.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
    //Return the number of rows in the section.
    return [self.photosInPlace count];
}

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

    NSString *string = [[self.photosInPlace objectAtIndex:indexPath.row] valueForKeyPath:@"description._content"];

    cell.textLabel.text = string;

    return cell;
}

InformationsquelleAutor der Frage gsapienza | 2012-08-03

CellIdentifier Ich Wette Ihr cellForRowAtIndexPath zurück nil.

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

    /** NOTE: This method can return nil so you need to account for that in code */
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    //NOTE: Add some code like this to create a new cell if there are none to reuse
    if(cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

    }

    NSString *string = [[self.photosInPlace objectAtIndex:indexPath.row]     valueForKeyPath:@"description._content"];

    cell.textLabel.text = string;

    return cell;
}

Das ist wahrscheinlich der Grund, warum [UITableView _configureCellForDisplay:forIndexPath:] versagt... weil cellForRowAtIndexPath ist wieder ein null-Wert, und dann configureCellForDisplay erwartet ein UITableViewCell.

InformationsquelleAutor der Antwort jerrylroberts

2

Diese Zeile hier
```
static NSString *CellIdentifier = @"Photos";
```
Macht dieses match für die cell-id in das storyboard? Ich habe diese nicht übereinstimmende war die Ursache für das problem für mich!

InformationsquelleAutor der Antwort Matt Rees

Ich Stand vor dem gleichen problem und lösen es, weil ich vergaß hinzuzufügen,

return cell;

nun gelöst sein.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    if(tableView==notiTblView){

        NSLog(@"TABLE NEW");

        static NSString *cellIdentifier = @"MenuCell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        UIImageView *imageview;
        UILabel *label;
        UILabel *lblDetail;

        if(cell == nil)
        {

            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault   reuseIdentifier:cellIdentifier];
            imageview=[[UIImageView alloc]initWithFrame:CGRectMake(8, 3,30, 37)];
            label=[[UILabel alloc]initWithFrame:CGRectMake(70, 10, 100, 20)];
            lblDetail=[[UILabel alloc]initWithFrame:CGRectMake(70, 35, 100, 30)];
            lblDetail.numberOfLines=3;

            imageview.tag=100;
            label.tag=101;
            lblDetail.tag=102;

            label.textColor=[UIColor blackColor];
            label.font=[UIFont systemFontOfSize:15];
            label.backgroundColor=[UIColor clearColor];

            lblDetail.textColor=[UIColor grayColor];
            lblDetail.font=[UIFont systemFontOfSize:13];
            lblDetail.backgroundColor=[UIColor clearColor];


            [cell.contentView addSubview:imageview];
            [cell.contentView addSubview:label];
            [cell.contentView addSubview:lblDetail];

        }

        cell.selectionStyle=UITableViewCellSelectionStyleNone;
        UIImageView *img=(UIImageView *)[cell.contentView viewWithTag:100];
        UILabel *lbl=(UILabel *)[cell.contentView viewWithTag:101];

        NSString * stirngId = [NSString stringWithFormat:@"%@",[[notificationARRAY objectAtIndex:indexPath.row]objectForKey:@"photoID"]];

        if ([dicImages_msg valueForKey:[[notificationARRAY objectAtIndex:indexPath.row] valueForKey:@"productName"]]) {

            img.image=[dicImages_msg valueForKey:[[notificationARRAY objectAtIndex:indexPath.row] valueForKey:@"productName"]];

        }
        else
        {
            if (!isDragging_msg && !isDecliring_msg)
            {
                [dicImages_msg setObject:[UIImage imageNamed:@"timthumb.jpg"] forKey:[[notificationARRAY objectAtIndex:indexPath.row] valueForKey:@"productName"]];
                [self performSelectorInBackground:@selector(download_Noti_image:) withObject:indexPath];
            }
            else
            {
                img.image=[UIImage imageNamed:@"timthumb.jpg"];
            }
        }

        lbl.text=[[notificationARRAY objectAtIndex:indexPath.row] objectForKey:@"memberName"];
        lbl.text=[[notificationARRAY objectAtIndex:indexPath.row] objectForKey:@"memberName"];

        return cell;

       /* static NSString *MyIdentifier = @"MyIdentifier";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier] ;
            cell.selectionStyle=UITableViewCellSelectionStyleNone;
            }
        cell.textLabel.text=[[notificationARRAY objectAtIndex:indexPath.row] objectForKey:@"memberName"];
        return cell;*/

   }else{
       static NSString *cellIdentifier = @"MenuCell";
       TblCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
       if (cell==nil) {
           cell = [[TblCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
            }

       NSLog(@"arr..in table..%@",PostedItem);
       cell.selectionStyle=UITableViewCellSelectionStyleNone;

       if([[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"productType"] isEqualToString :@"Video"]){
           cell.postedimage.image=[UIImage imageNamed:@"play_icon.png"];
       }else{

           if ([dicImages_msg valueForKey:[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"productName"]]) {

               cell.postedimage.image=[dicImages_msg valueForKey:[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"productName"]];

           }else
            {
                if (!isDragging_msg && !isDecliring_msg)
                    {
                        [dicImages_msg setObject:[UIImage imageNamed:@"timthumb.jpg"] forKey:[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"productName"]];
                        [self performSelectorInBackground:@selector(downloadImage_3:) withObject:indexPath];
                    } else
                        {
                            cell.postedimage.image=[UIImage imageNamed:@"timthumb.jpg"];
                        }
            }

       }
//*******************User image
    if ([dic_usrImg valueForKey:[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"thumbUrl"]]) {

        cell.profileImage.image=[dic_usrImg valueForKey:[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"thumbUrl"]];

    }
    else
    {
        if (!isDragging_msg && !isDecliring_msg)
        {
            [dic_usrImg setObject:[UIImage imageNamed:@"timthumb.jpg"] forKey:[[PostedItem objectAtIndex:indexPath.row] valueForKey:@"thumbUrl"]];
            [self performSelectorInBackground:@selector(downloadImage_IMAGE4:) withObject:indexPath];
        }
        else
        {
            cell.profileImage.image=[UIImage imageNamed:@"timthumb.jpg"];
        }
    }
//********************************
    [cell.btnImage setTag:100000+indexPath.row];
    [cell.btnImage  addTarget:self action:@selector(Shopw_feedImg:) forControlEvents:UIControlEventTouchUpInside];
//***************
    cell.postedimage.tag=indexPath.row;
    [cell.postedimage setUserInteractionEnabled:YES];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onImageClick:)];
    [tap setNumberOfTouchesRequired:1];
    [tap setNumberOfTapsRequired:1];
    [tap setDelegate:self];
    [cell.postedimage addGestureRecognizer:tap];
    cell.membername.text=[[PostedItem objectAtIndex:indexPath.row] objectForKey:@"userName"];
    [cell.membername sizeToFit];
    //[[PostedItem objectAtIndex:indexPath.row] objectForKey:@"memberID"];  
    cell.productName.text= [[PostedItem objectAtIndex:indexPath.row]objectForKey:@"photoTitle"];
    //@"hello this is a test doviumbmvbhdf asx";
   //with new sffhy dgftn tun dgh ";
  // NSLog(@"Str Length...%d",[cell.productName.text length]);
    if ([cell.productName.text length]>38) {

        NSLog(@"greater then...%@",cell.productName.text);
         cell.productName.numberOfLines=2;
        CGRect frame=cell.postedimage.frame;
        frame.origin.y=130;
        cell.postedimage.frame=frame;
        CGRect Prdctframe=cell.productName.frame;
        frame.size.height=40.0f;
        cell.productName.frame=Prdctframe;
        //cell.postedimage.frame.origin.y=115.0f;
    }//[[PostedItem objectAtIndex:indexPath.row]objectForKey:@"photoTitle"];
      //@"szfgfgbjmghufho stdogb ryt;o esftesi rdetg ry ry ry ";//
    else
    {
        cell.productName.numberOfLines=1;
        CGRect frame=cell.postedimage.frame;
        frame.origin.y=110;
        cell.postedimage.frame=frame;
        CGRect Prdctframe=cell.productName.frame;
        Prdctframe.size.height=20.0f;
        cell.productName.frame=Prdctframe;
          NSLog(@"less then...");
    }

    //[cell.productName sizeToFit];
 //  cell.profileImage.image=[UIImage imageNamed:@"timthumb.jpg"];
    return cell;
   }

}

InformationsquelleAutor der Antwort mahendra

0

Sind Sie nicht die Schaffung Zelle in der Methode
```
tableView:cellForRowAtIndexPath:
```
Nur die Wiederverwendung der Zelle von dieser Methode gibt nil zunächst.

Müssen Sie Zelle erstellen, indem Sie das unten gegebene code in der Methode.
```
if(cell==nil){

    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault 
reuseIdentifier:CellIdentifier] autorelease];

}
```
InformationsquelleAutor der Antwort Baalu

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