UITableViewController will not call cellForRowAtIndexPath, but numberOfSectionsInTableView and numberOfRowsInSection are really set correctly

Question

#import "AssignmentsViewController.h"
#import "Assignment.h"

@interface AssignmentsViewController ()

@property NSMutableArray *assignments;
@property (weak, nonatomic) IBOutlet UITableView *tableView;

@end

@implementation AssignmentsViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    NSLog(@"viewDidLoad");
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.assignments = [[MySingleton sharedMySingleton] assignments];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
}

- (void)viewWillAppear:(BOOL)animated {
    NSLog(@"viewWillAppear");
    [self.tableView reloadData];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    NSLog(@"numberOfSectionsInTableView");
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSLog(@"numberOfRowsInSection");
    return [self.assignments count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"cellForRowAtIndexPath");
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"AssignmentCell"];
    if(cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"AssignmentCell"];
    }
    cell.textLabel.text = [[self.assignments objectAtIndex:indexPath.row] title];
    return cell;
}

@end

Console output when loading the AssignmentsViewController and at least one homework is in the destination array:

2013-11-06 18:55:09.396 Homework Planner[4756:70b] viewDidLoad
2013-11-06 18:55:09.403 Homework Planner[4756:70b] numberOfSectionsInTableView
2013-11-06 18:55:09.405 Homework Planner[4756:70b] numberOfRowsInSection
2013-11-06 18:55:09.408 Homework Planner[4756:70b] viewWillAppear
2013-11-06 18:55:09.409 Homework Planner[4756:70b] numberOfSectionsInTableView
2013-11-06 18:55:09.409 Homework Planner[4756:70b] numberOfRowsInSection

, . - cellForRowAtIndexPath , , homework. , , , , "", , . , , UITableView, cellForRowAtIndexPath. , , .

Answer 1

, [self.assignments count] 0 (, self.assignments nil.

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSLog(@"[self.assignments count] = %d", [self.assignments count]);
}

, , - , , 0 ( , , , ).

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
  CGFloat height = 0;
  // Some calculation to determine height of row/cell.

  return height;
}

Answer 2

: " ".

TableView DataSource ( ), TableView , , suprisingly, tableView: cellForRowAtIndexPath: , numberOfSections numberOfRows

Answer 3

cellForRowAtIndexPath , ( ), UITableView.

, , , ( ). , UITableView .

, reloadData .

:

OfferTableViewController * offerList = [[OfferTableViewController alloc] init];

// add the view in the parent view to make sure that the dimension are calculated
[fullSiteView.offersView addSubview: offerList.view]; 
offerList.delegate = self;
// Set the data
offerList.offers = product.offers;
// Force reload to render
[offerList.tableView reloadData];

, heightForRowAtIndexPath, , - > 0

, numberOfRowsInSection numberOfSectionsInTableView , , cellForRowAtIndexPath

Answer 4

, 0 ...

I’ve been stuck for ages watching logs numberOfRowsInSection: called and heightForRowAtIndexPath: called and returned a solid value, but cellForRowAtIndexPath: never called!

Try displaying the frame of the View table or setting the background color on it to see if it actually displays on the screen.