来自Marko队的来到你面前
我们是一个令人难以置信的奇怪问题,我们的表格查看单元格,通常如下所示：
出现如下：
经过审核,当您将iPhone置于睡眠状态时,该错误似乎发生,然后重新打开应用程序并转到放置了tableview的uiviewcontroller.不知何故,这使得不再调用cellForRowAtIndexPath,即使委托和数据源仍设置为self.我们的部分和行号仍然正常,我们可以在tableview上向下滚动.但由于未调用cellForRowAtIndexPath,因此隐藏了tableviewcells.
这是我们的tableview设置(我从这个与tableview无关的巨大文件中取出了东西：
//
// 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
最后,如果您认为它与我们的委托有关,我们不会触及那里的视图控制器,所以我不知道这可能是一个什么问题.可能是内存问题还是后台线程问题？
最佳答案 这是很多代码,问题可能出在你的自定义SPTableViewCell类中,甚至不是你提供的.
为了加快速度,重现问题时请进入调试器并转储视图层次结构.您可以通过在视图控制器上调用[self.view recursiveDescription]来完成此操作.这将导致整个子视图层次结构被打印到控制台,这将让您看到应该 – 但不是 – 显示的单元格正在发生什么.如果没有给你带来任何快乐,请将输出发布在这里.
But, what is even weirder is that the tableview is still there and it is not a subview problem because you can still scroll:
它可能仍然是一个子视图问题 – tableview从单独的调用中获取单元格的高度,因此它独立于单元格本身.尝试打印层次结构以查看正在发生的情况.
