UITableView delegate and dataSource methods not getting called

Question

I have a UIView which contains a UITableView. The tableview's delegate is set to my UIView, but it never calls the delegate methods:

-(id)init {
    self = [super init];
    if (self) {
        self.tableView = [[UITableView alloc] initWithFrame:self.bounds];
        self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        self.tableView.dataSource = self;
        self.tableView.delegate = self;
        self.tableView.scrollEnabled = NO;
        self.tableView.layer.cornerRadius = PanelCornerRadius;
        [self addSubview:self.tableView];
    }
    return self;
}

#pragma mark - UITableViewDelegate methods

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    NSLog(@"height for row");
    int height = [self heightForRowAtIndexPath:indexPath];

    return height;
}

#pragma mark - UITableViewDataSource methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    NSLog(@"number of rows");
    if (self.manager.fetchOperation.dataFetchProblem) {
        return 1;
    }

    int numberOfRows = [self.delegate numberOfSectionsInPanel:self];

    return numberOfRows;
}

I've explored every option I can think of, but can't seem to find the root of the problem.

EDIT: Included the numberOfRowsInSection. It could potentially return 0, only it never gets that chance because the "number of rows" NSLog never gets called.

Also, if this is in a UIView like you said, you should put the code that's in `init` to `awakeFromNib` — Lance, Sep 23 '13 at 22:39
@Lance I have an NSLog in there too - it doesn't get called. I edited into my post above. — Andrew, Sep 23 '13 at 22:40
I subclassed the UITableView and put in a setReloadData:. It doesn't get called. — Andrew, Sep 23 '13 at 22:44
@Lance just tried that. Nothing. I even tried checking for the delegate at that point. Delegate is still set to my view. — Andrew, Sep 23 '13 at 22:47
You should also implement `- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView` and return at least 1. — gWiz, Sep 23 '13 at 23:16
Would it be possible that you didn't add the UIView into another visible view? The tableview will only be drawn when it is visible. Otherwise I can't see anything wrong from your code. I do the same thing before, and it works as charm. — Vincent, Sep 24 '13 at 00:58
Are you adding this view that holds tableView from code of within Interface Builder? — Rok Jarc, Sep 24 '13 at 07:09

score 22 · Answer 1 · edited Jan 29 '14 at 10:00

Can you please write the code that you have written on your cellForRowAtIndexPath: method? Because i can't find anything wrong with your code.

Are you calling your UIView from some other ViewController? If yes, how?

I have done something like this once. I declared a method in the UIView like this :

- (void)setUpTableView{
    self.tableview.delegate=self;
    self.tableview.dataSource=self;
}

And then i called the setUpTableView from the view controller i added this view to, like this :

[self.yourView setUpTableView];

This might help. Thanks.

I had the same problem, using my own view controller. Forgot the dataSource=self. — Bill Cheswick, Sep 12 '16 at 13:43

score 16 · Answer 2 · edited Aug 18 '14 at 19:34

16

I had a similar problem, my solution was because I did not set the number of sections to 1.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

edited Aug 18 '14 at 19:34

vikingosegundo

52,040
14
137
178

answered Aug 18 '14 at 18:44

Darkin

221
2
4

score 3 · Answer 3 · answered Sep 23 '13 at 22:52

3

You should declare your view like this @interface MyView : UIView <UITableViewDelegate, UITableViewDataSource>

BTW: I would have a ViewController that "controls" your view and your tableview, and have the ViewController be the delegate and datasource of the table view.

answered Sep 23 '13 at 22:52

gWiz

1,274
9
12

1

I don't think the *.h declaration is the issue. However, I totally agree with having a view controller that controls the view and the table view. That's what they're there for. +1 – LuisCien Sep 23 '13 at 22:54
Ah yea, this makes sense. I'm sure the tableview calls `conformsToProtocol:` on the delegate/dataSource – Lance Sep 23 '13 at 23:00
@LuisCien You are right. the .h isn't the issue. I just checked that in one of my projects. I removed these protocols and the methods do get called. – gWiz Sep 23 '13 at 23:01

score 3 · Answer 4 · answered Sep 23 '13 at 23:43

You do not need to use a UIViewController, that's just a smokescreen. You also do not need to add to the .h, although you should do that anyway because Xcode will complain otherwise, and you won't get method name auto complete.

I just wrote a test project that embeds a table view in a normal UIView and it works fine. Just make sure your initialization code is being called. I bet you need to move it to awakeFromNib.

score 1 · Answer 5 · answered Mar 13 '15 at 00:24

I ran into the same issue once, what silly mistake I did was inside initWithCoder I called [super init]. TableView was in xib

-(id) initWithCoder:(NSCoder *)aDecoder
{
    self = [super init]
}

Instead of

-(id) initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
}

Just check if that's not the case

score 1 · Answer 6 · answered Sep 08 '17 at 21:47

1

try this:

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

i had this stupid problem too

answered Sep 08 '17 at 21:47

ironRoei

2,049
24
45

score 0 · Answer 7 · answered Sep 23 '13 at 23:22

Try changing your UIViewto UIViewController and in viewDidLoad, call

[[UITableView alloc] initWithFrame:style:] to create your Table View.

Set self as the delegate and data source like you did above, and then add this UITableView as Subview in this Controller.

score 0 · Answer 8 · answered Sep 10 '19 at 14:56

I accidentally set my tableView's allowsSelection property to false.

Storyboard solution

Select your table view and set the following...

Swift solution

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.allowsSelection = true
}

Notes

At first, I thought this was a UITableViewDelegate issue (as other answers suggested). It wasn't. I linked it to my view controller in my storyboard.
Next, I thought it was a UITableViewDataSource issue, in that I didn't implement the protocol's numberOfSections(in tableView:) method (as other answers suggested). It wasn't. According UIKit's documentation,

// Default is 1 if not implemented

Finally, I checked the settings on my table view :]

UITableView delegate and dataSource methods not getting called

8 Answers8

Linked