UITableView reloadData is not working in iOS

Question

I'm creating the UITableView datasource array using this code:

-(void) viewWillAppear:(BOOL)animated
{
    // IBOutlet of tableview is 'editMsgTableView'
    editMsgTableView.dataSource=nil; 
    editMsgTableView.delegate=nil;

    menuMessageArray = [[NSMutableArray alloc] init];
    editMainMenuMsgArray = [[NSMutableArray alloc] init];
    menuMessageArray = [DBManager fetchmenu:0 noOfRows:32];

    for(int i=0; i< [menuMessageArray count]; i++)
    {
        NSMutableDictionary *menuMsgListDic = [[NSMutableDictionary alloc] init];
        menuMsgListDic = [menuMessageArray objectAtIndex:i];
        [editMainMenuMsgArray addObject:menuMsgListDic];  
    }

    editMsgTableView.dataSource=self;
    editMsgTableView.delegate=self;
    [editMsgTableView reloadData];
}

But it works for the first time. But whenever I do some tableView editing stuff or comes from another view controller,after that if viewWillAppearis called then reloadData is not working. I also tried:

dispatch_sync(dispatch_get_main_queue(), ^{
    [editMsgTableView reloadData];
});

but not working. Please help me out.

maybe your reload is called but noting is changed. Do the delegate methods of tableview get called? — Fawad Masud
– Fawad Masud, Commented Feb 4, 2015 at 6:18
First of all, do you really want to populate the contents of your table everytime your view will appear? Have you debugged if numberOfSectionsInTableView get called? — Lie-An
– Lie-An, Commented Feb 4, 2015 at 6:19
Why you are removing and setting datasource & delegate of editMsgTableView each time in viewWillAppear. Instead set delegate and datasource in viewDidLoad. Use dealloc method for releasing. — Mehul Patel
– Mehul Patel, Commented Feb 4, 2015 at 6:22

Olie · Accepted Answer · 2015-04-11 16:08:37Z

3

When editing begins call [tableView startUpading]; and when editing is done, call [tableView stopUpdating]; then [tableView reloadData];.

edited Apr 11, 2015 at 16:08

Olie

24.7k18 gold badges102 silver badges132 bronze badges

answered Feb 4, 2015 at 6:41

Muhammad Anum

13716 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

tod Over a year ago

this can easily go in comment

amar Over a year ago

@tod not enough repo :)

Saif · Accepted Answer · 2015-02-04 07:21:35Z

0

Try ,

dispatch_async(dispatch_get_main_queue(), ^{
    [editMsgTableView reloadData];
});

answered Feb 4, 2015 at 7:21

Saif

3,0182 gold badges28 silver badges39 bronze badges

Comments

Luis Mejías · Accepted Answer · 2015-02-04 16:24:37Z

are you giving to that viewController the tableViewDelegates correctly? :

@interface theNameOfTheViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> in the .h file?

i suggest not to do this:
editMsgTableView.dataSource=nil; editMsgTableView.delegate=nil; editMsgTableView.dataSource=self; editMsgTableView.delegate=self;

just this:

[self.editMsgTableView reloadData];

be sure that all the delegate methods are called when you use reloadData (put a breakpoint in every delegate method that should be used to reload the Data of the table when you make a change or the view Appears), remember that reloadData method, calls all delegate methods (if you´re giving to the view controller correctly the delegate as I said before) of the tableViewController. If nothing of this helps you, tell me.

Leon Adler · Accepted Answer · 2016-02-02 06:01:55Z

0

I am assuming that you are navigating the view from one view to another view, then you should call [tableView reloadData] on ViewDidLoad. This is because of the view life cycle - when you are coming back from one view and your tableView data source is updated, the view life cycle will be like this:

viewDidLoad
tableViewDelegateMethods
viewDidAppear

So when you update tableView's data source object and call reloadData during viewDidLoad will resolve the issue.

edited Feb 2, 2016 at 6:01

Leon Adler

3,3851 gold badge33 silver badges43 bronze badges

answered Feb 2, 2016 at 5:27

sabin mohan

112 bronze badges

Collectives™ on Stack Overflow

UITableView reloadData is not working in iOS

4 Answers 4

2 Comments

Comments

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

2 Comments

Comments

Comments

Comments

Related