-tableView:cellForRowAtIndexPath: is not getting c

问题:

I've UITableView in UIViewController and I've connected through outlet and delegete and datasource are assigned to self.numberOfSectionsInTableView and numberOfRowsInSection are getting called i tried by using NSLogbut cellForRowAtIndexPath is not getting call my code looks like

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

    NSLog(@" cellForRowAtIndexPath ");

    static NSString *CellIdentifier = @"CurrencyCell";

    CurrencyCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[CurrencyCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] ;
    }
    new *Obj = [appdelegate.array objectAtIndex:indexPath.row];


    cell.CurNameLabel.text = Obj.C_Name;
    cell.textLabel.text = @"sdfnhsdfndsio;";
    NSLog(@"C_Name %@", Obj.C_Name);

    return cell;
}

can any one tel wer i'm making mistake Thanks in advance

回答1:

It seems the numberOfSectionsInTableView and numberOfRowsInSection returned are 0.If this is the case then cellForRowAtIndexPath will not get called..

From the comment above..it seems that "YourAppDelegate" variable is null or yourArray is null.Try keeping the break point on these delegates ,to check the values returned by them

回答2:

try this add delegate and datasource in .h file like below..

@interface AddProjectViewController : UIViewController<
UITableViewDataSource,UITableViewDelegate>
.....
@end

after in viewDidLoad: put this code..

    - (void)viewDidLoad
   {
        yourTableView.delegate= self;
        yourTableView.dataSource=self;
   }

and at last try this in numberOfRowsInSection method to return some int value more than 0

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [yourArray count];//or any int value
}

回答3:

It seems the numberOfSectionsInTableView and numberOfRowsInSection returned are 0 or may be another reason for this

Carefully check below Points

1 if you are creating TableView from XIB the should set the datasource and delegate to the Files' Owner in.

if You are creating it programatically then you should set the delegate and dataSource as below and don't forget to adopt the dataSourec and delegate for UItableView in .h

   YourViewController : UIViewController<UITableViewdelegate, UITableViewDatasource>

Put The Below line of Code just After the Line where you are creating the UITableView

        tableViewObj.delegate= self;
        tableViewObj.dataSource=self

2 Carefully check does your datasource(whatever the name of Array) have data because whenever you create the number of rows you pass the array `count as given Below

  - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
     {  
      int  numberOfRows= [datasource count];
      return numberOfRows;
      //  here check does the `numberOfRows` have nonzero value or just 0
      if it retunes 0 then cellForAtIndexPath would not call .
   }

I hope it'll helpful to You

回答4:

If you enabled multithreading concept in your app, even if you call reloadData method on tableview cellForRowAtIndexPath won't be called sometimes. So call realod method like this:

[self performSelectorOnMainThread:@selector(reloadTable) withObject:self waitUntilDone:NO];

It may work.

- (void)reloadTable
{
    [self.tableView reloadData];
}

If you are not in multithreading environment, then you need to make sure tableviews delegate and datasource are not null.

回答5:

Check the number values in your array in "numberOfRowsInSection" method. print your array before returning value.

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"%@",returnedArray);
    return [returnedArray count];//
}

Also you can try sending some static number of rows in your method to check.

It looks like your array is getting null in that method.

Hope it resolves your issue.