UITableView cells strangely disappear

Question

will come to you from the Marko team

We find an incredible strange problem that displays our tables, which usually look like this:

Appears for example:

After viewing the error appears when you put the iPhone to sleep, then open the application again and go to the uiviewcontroller, which hosts the tableview. Somehow it makes the cellForRowAtIndexPath no longer called, although the delegate and data sources are still configured for themselves. Our sections and line numbers are still normal, and we can scroll down the table. But since cellForRowAtIndexPath does not receive the call, viewviews tables are hidden.

Here is our tableview setup (I pulled stuff from this huge file that has nothing to do with the table view:

//
//  SPHomeViewController.m
//  Spek

@interface SPHomeViewController () <UITableViewDataSource, UITableViewDelegate, MKMapViewDelegate, SPCreationViewDelegate, UIAlertViewDelegate, CLLocationManagerDelegate>
@property (nonatomic, strong) UITableView* tableView;
@property (nonatomic, strong) NSMutableArray* tableDatasource;
@property (nonatomic, strong) NSMutableArray* datasource;
@property (nonatomic, strong) NSMutableArray* friendsDatasource;
@property (nonatomic, strong) UISegmentedControl* userFilterSegment;
@property (nonatomic) BOOL isLoadingData;
@end

@implementation SPHomeViewController

@synthesize datasource = _datasource;
@synthesize friendsDatasource = _friendsDatasource;
@synthesize tableDatasource = _tableDatasource;



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

- (void)viewDidLoad {
    [super viewDidLoad];
    //[[SPLocationManager locationManager] startUpdatingLocationForSig];
    [self setNeedsStatusBarAppearanceUpdate];
    self.view.backgroundColor = [UIColor colorWithRed:230.0f/255.0f green:230.0f/255.0f blue:230.0f/255.0f alpha:1.0];
    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - kTopBarHeight)];
    self.tableView.separatorColor = [UIColor clearColor];
    self.tableView.backgroundColor = [UIColor clearColor];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    [self.view addSubview:self.tableView];


}

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

    if (self.creationView.center.y > self.view.frame.size.height) {
        self.creationView = nil;
    }
    NSLog(@"Mem warning");
}


//****************************************
//****************************************
#pragma mark - UITableViewDelegate/DataSource
//****************************************
//****************************************

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"INDEX PATH ROW: %d AND SECTION: %d", indexPath.row, indexPath.section);
    if (indexPath.section == 0) {
        UITableViewCell* cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"SPMapCellSpace"];
        cell.backgroundColor = [UIColor clearColor];
        cell.backgroundView = [[UIView alloc] init];
        cell.selectedBackgroundView = [[UIView alloc] init];
        return cell;
    } else if (indexPath.section == self.tableDatasource.count + 1) {
        UITableViewCell* cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"SPBottomCellSpace"];
        cell.backgroundColor = [UIColor clearColor];
        cell.backgroundView = [[UIView alloc] init];
        cell.selectedBackgroundView = [[UIView alloc] init];

        return cell;
    }
    SPMark* mark = self.tableDatasource[indexPath.section - 1];
    NSString* reuseId = [SPHomeViewController cellIdentifierFromData:mark];
    SPTableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:reuseId];
    if (cell == nil) {
        cell = [SPTableViewCell cellFromMark:mark reuseID:reuseId];
        [cell updateView:YES];
    }
    [cell addDataToCell:mark];
    if (indexPath.section >= self.tableDatasource.count - 2 && !self.isLoadingData && self.pageNumber != -1) {
        self.fetchNextPage = YES;  // When the scrollview stops it will load more data if available.
    }

    return cell;
}

- (unsigned int)getPageNumber {
    return (self.userFilterSegment.selectedSegmentIndex == 0) ? self.pageNumber : self.friendsPageNumber;
}

- (void)setCurrentPageNumber:(unsigned int)page {
    if (self.userFilterSegment.selectedSegmentIndex == 0) {
        self.pageNumber = page;
    } else {
        self.friendsPageNumber = page;
    }
}

- (void)incrementCurrentPageNumber {
    if (self.userFilterSegment.selectedSegmentIndex == 0) {
        self.pageNumber++;
    } else {
        self.friendsPageNumber++;
    }
}

// Every cell has a section header so this should be equal to the number of speks returned from the server
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    NSLog(@"section count is: %d",self.tableDatasource.count + 2 );
    return self.tableDatasource.count + 2;  // Add two because the mapview needs to go on the top and extra spacing at the bottom.
}

// There is a section for every cell, so there is only one cell per section
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 1;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == 0) {
        return kMapHeight+2;
    } else if (indexPath.section == self.tableDatasource.count + 1) {
        return kExtraSpaceBelowHomeView;
    }
    SPMark* mark = self.tableDatasource[indexPath.section - 1];
    return [SPTableViewCell cellHeightForMark:mark];
}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == 0 || indexPath.section == self.tableDatasource.count + 1) {
        cell.backgroundColor = [UIColor clearColor];
    }
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == 0 || indexPath.section == self.tableDatasource.count + 1)
        return;
    SPMark* mark = self.datasource[indexPath.section - 1 ];
    SPMarkViewController* markVC = [SPMarkViewController withMark:mark];
    [markVC displayData];
    [self.navigationController pushViewController:markVC animated:YES];
}

-(void)reloadTableview {
    [self.tableView setDelegate:self];
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.tableView reloadData];
        [self.tableView setNeedsDisplay];
    });
}

- (void)showNoItems {
    if (self.tableDatasource.count == 0 && self.accuracyBad == NO) {
        self.opaqueIcon.hidden = NO;
        self.noItems.hidden = NO;
        self.beTheFirst.hidden = NO;
        self.downArrow.hidden = NO;
        self.noItemsBackround.hidden = NO;
        [self.view bringSubviewToFront:self.noItemsBackround];
        [self.view bringSubviewToFront:self.downArrow];
        [self.view bringSubviewToFront:self.beTheFirst];
        [self.view bringSubviewToFront:self.noItems];
        [self.view bringSubviewToFront:self.opaqueIcon];

    }
}

- (void)showTableView {
    if (self.tableDatasource.count != 0) {
        self.noItems.hidden = YES;
        self.beTheFirst.hidden = YES;
        self.downArrow.hidden = YES;
        self.noItemsBackround.hidden = YES;
        self.opaqueIcon.hidden = YES;

        [self.view sendSubviewToBack:self.noItemsBackround];
        [self.view sendSubviewToBack:self.downArrow];
        [self.view sendSubviewToBack:self.beTheFirst];
        [self.view sendSubviewToBack:self.noItems];
        [self.view sendSubviewToBack:self.opaqueIcon];
    }
}

//****************************************
//****************************************
#pragma mark - Setters/Getters
//****************************************
//****************************************

- (NSMutableArray*)datasource {
    if (!_datasource) {
        _datasource = [NSMutableArray array];
        if (!self.firstLoad) {
            [self loadDataForPagination:NO];
        }
    }
    return _datasource;
}

- (NSMutableArray*)friendsDatasource {
    if (!_friendsDatasource) {
        _friendsDatasource = [NSMutableArray array];
        if (!self.firstLoad) {
            [self loadDataForPagination:NO];
        }
    }
    return _friendsDatasource;
}

- (NSMutableArray*)tableDatasource {
    if (!_tableDatasource) {
        _tableDatasource = (self.userFilterSegment.selectedSegmentIndex == 0) ? self.datasource : self.friendsDatasource;
    }
    return _tableDatasource;
}

- (SPCreationView*)creationView {
    if (!_creationView) {
        UIView* window = [SPUtils getAppDelegate].window;
        CGSize viewSize = window.frame.size;
        CGRect startFrame = CGRectMake(0, viewSize.height, [SPUtils screenWidth], [SPUtils screenHeight]);
        _creationView = [SPCreationView creationView:startFrame delegate:self];
        [window insertSubview:_creationView belowSubview:self.creationButton];
        _creationView.frame = startFrame;
    }
    return _creationView;
}

- (void)setTableDatasource:(NSMutableArray *)tableDatasource {
    _tableDatasource = tableDatasource;
    [self preFetchImages];
    dispatch_async(dispatch_get_main_queue(), ^{
        if(_tableDatasource == nil || _tableDatasource.count == 0) {
            [self showNoItems];
        } else {
            [self showTableView];
        }
        [self reloadTableview];
    });
}

- (void)setDatasource:(NSMutableArray *)datasource {
    _datasource = datasource;
}

- (void)setFriendsDatasource:(NSMutableArray *)friendsDatasource {
    _friendsDatasource = friendsDatasource;
}


@end

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Answer 1

, . , .

Answer 2

, , SPTableViewCell , .

, . , [self.view recursiveDescription] . , , , , - . , .

, , , , , :

subview - tableview , . , , .