iOS 5 Storyboard Custom Cell Crash: UITableView dataSource must return a cell

问题

This is either an XCode bug, or me missing a crucial rule here.

Update: - What's the chance of this being a weird bug in XCode/Storyboard?

Situation:

iOS 5, Storyboard
This is the storyboard setup: http://i.imgur.com/T5WyD.png
Another screenshot of the full setup: http://i.imgur.com/1tVuz.png
TableViewController with Custom Cell, cell has reusable identifier "NewCell"
in "cellForRowAtIndexPath" I basically have:

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"NewCell"]; return cell;
This throws an exception:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'

Things I have already tried:

I setup a new project from scratch, TabBarController, with a TableViewController and a Custom Cell, all wired up in Storyboard, set a reusable cell identifier. Used the same code as above, worked perfectly. I don't know why it didn't work with the storyboard above...

I have a feeling it has something to do with the tree I built there, which is a TabBarController, loading a NavigationController, loading a TableViewController, providing a few items, one is clicked, which loads another TableViewController, which is unable to work with the custom cell, somehow.

Important: - The issue is that the Storyboard should make sure that: UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"NewCell"]; will never return NIL (unlike without the Storyboard/iOS4). But, mine is nil. And I can't, for the hell of it, figure out what's happening.

回答1:

Heyo, I just had this problem today and figured out a few possible causes. To link a UITableView as a subview of a ViewController in Story board check that you have done these steps.

In your "ViewController.h", add <UITableViewDataSource> to your list of protocols

@interface ViewController : UIViewController <UITableViewDataSource>

you might want to add <UITableViewDelegate> as well but I didn't.

In your "ViewController.m" set up your Table view data source functions

#pragma mark - Table view data source

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [yourCells count];
}

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

    NewCell *cell = (NewCell *)[tableView 
                                           dequeueReusableCellWithIdentifier:@"NewCell"];
    if (cell == nil) {
        NSLog(@"Cell is NIL");
        cell = [[CustomCell alloc] 
                initWithStyle:UITableViewCellStyleDefault 
                reuseIdentifier:CellIdentifier];
    }

    return cell;


}

In Storyboard, connect the UITableView's "Data Source" and "Delegate" references to the ViewController.
In Storyboard, give the Prototype Cell the Identifier "NewCell"

If these are done, I believe it should work.

Hope this helps =)

回答2:

I always use custom cells in the storyboard like this:

static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
return cell;

Make sure the number of rows/sections is at least one. And another thing to check is that you set the UITableViewController to your custom class name in the storyboard.

回答3:

Did you double check the cell prototype identifier is "NewCell"?
Your setup as Tabbar->navigationcontroller->tableview is perfectly fine. I am using this layout all the time.
verify also there's no useless runtime attributes anywhere in this
viewcontroller/tableview/cell.
your prototype looks a bit weird there - you added a UIButton to the cell as subview? why?

回答4:

To solve this problem add the following just above your dequeueReusableCellWithIdentifier statement:

static NSString *CellIdentifier = @"NewCell";

making sure the identifier matches the prototype cell in Storyboard

回答5:

It maybe late to answer this but i bet this will fix all your problems

来源：https://stackoverflow.com/questions/25211632/uitableview-with-parse-error-help-nsinternalinconsistencyexception

标签

iphone

ios5

cell

storyboard