UITableView委托和dataSource方法没有被调用

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.

Answer 1

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.

Answer 2

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;
}

Answer 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.

Answer 4

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.

Answer 5

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

Answer 6

try this:

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

i had this stupid problem too

Answer 7

Try changing your UIView to 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.

Answer 8

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

1. 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.
2. 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

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