Question

我有一个具有此cellForRowAtIndexPath方法的应用：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    TableViewCell *cell = nil;

    //IF NO STORES FOUND
    if ([self.annotationsToSort count] == 0) {
        NSLog(@"No results");
        cell.nameLabel.text = @"No results";
    }

    // Check to see whether the normal table or search results table is being displayed    
    //IF ITS A SEARCH TABLE....>>>>>>>>>
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        static NSString *CellIdentifier = @"HolidayCell";
        if (cell == nil) {
            cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
        }
        cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];

        Location *location = [filteredResultsArray objectAtIndex:indexPath.row];
        cell.nameLabel.text = location.nombrePublico;

    } else {

    // IF ITS A REGULAR TABLE...>>>>>>>>>>
        static NSString *CellIdentifier = @"HolidayCell";
        if (cell == nil) {
            cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
            //cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
        }
        cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];


        //USING SORTED ARRAY INSTEAD OF CDfetched ARRAY
        MyLocation *myLocation = [self.annotationsToSort objectAtIndex:indexPath.row];

        cell.nameLabel.text = myLocation.name;
        cell.dateLabel.text =  myLocation.address;
        cell.distancia.text = distance;
        cell.phoneLabel.text = myLocation.telefono;
        cell.openLabel.text = myLocation.estado;
        cell.driveThruLabel.text = myLocation.driveThru;

    }
    return cell;
}

但即使数据中没有结果，它也会返回空单元格，而不会产生无结果文本。行方法是：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    // Return the number of rows in the section.
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [filteredResultsArray count];
    } else {
        //return [self.farSiman count]; WAS CRASHING
        return [self.annotationsToSort count];
    }

}

我已经尝试将NO STORES FOUND代码块放在NORMAL STATE TABLE中，如果/ else并且它没有用。

Answer 1

如果[self.annotationsToSort count]为零，则为numberOfRowsInSection方法返回零，因此根本不调用cellForRowAtIndexPath，并且为空显示表格视图。

如果要显示特殊单元格“无结果”，则必须进行修改 numberOfRowsInSection以便在这种情况下返回1。例如，（未经测试，只是为了给你一个想法）：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if ([self.annotationsToSort count] == 0) {
        return 1;
    } else if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [filteredResultsArray count];
    } else {
        return [self.annotationsToSort count];
    }
}

您的cellForRowAtIndexPath方法中也存在一些错误。例如，在[self.annotationsToSort count] == 0的情况下没有分配单元格。它应该看起来更像这样（再次未经测试）：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"HolidayCell";
    cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }

    //IF NO STORES FOUND
    if ([self.annotationsToSort count] == 0) {
        NSLog(@"No results");
        cell.nameLabel.text = @"No results";
    } else if (tableView == self.searchDisplayController.searchResultsTableView) {
        Location *location = [filteredResultsArray objectAtIndex:indexPath.row];
        cell.nameLabel.text = location.nombrePublico;
    } else {
        MyLocation *myLocation = [self.annotationsToSort objectAtIndex:indexPath.row];

        cell.nameLabel.text = myLocation.name;
        cell.dateLabel.text =  myLocation.address;
        cell.distancia.text = distance;
        cell.phoneLabel.text = myLocation.telefono;
        cell.openLabel.text = myLocation.estado;
        cell.driveThruLabel.text = myLocation.driveThru;
    }
    return cell;
}

Answer 2

在您正在寻找的情况下，永远不会调用{p> cellForRowAtIndexPath。如果[self.annotationsToSort count]为0，那么它将不会创建任何单元格（因此它永远不会调用cellForRowAtIndexPath）。

当它调用cellForRowAtIndexPath时会有注释，所以它显然不会显示你的无结果标签。您还要将单元格设置为nil，然后尝试设置标签。因此，即使调用了cellForRowAtIndexPath，也不会发生任何事情，因为你的细胞是零！（你实际上会因此而崩溃：[self.annotationsToSort objectAtIndex:indexPath.row]）。

如果没有1那么，tableView:numberOfRowsInSection中的annotationsToSort会返回if (![self.annotationsToSort count]) { return 1; }，这样做很好：

cellForRowAtIndexPath

然后在- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { TableViewCell *cell = nil; // Check to see whether the normal table or search results table is being displayed if (tableView == self.searchDisplayController.searchResultsTableView) { // your code // } else { static NSString *CellIdentifier = @"HolidayCell"; // you need to dequeue the cell first, then check if it is nil! cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; // other static cell configurations } if ([self.annotationsToSort count] == 0) { NSLog(@"No results"); cell.nameLabel.text = @"No results"; } else { // this line will crash your code if annotationsToSort is empty MyLocation *myLocation = [self.annotationsToSort objectAtIndex:indexPath.row]; // configure cell with your code // } } return cell; }：

{{1}}

Answer 3

我希望它可以帮到你。尝试添加返回1;按照代码

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    // Return the number of rows in the section.


   if ([self.annotationsToSort count] == 0) 
    {
        return 1; 
    }
   else 
   { 
        return [self.annotationsToSort count];
   } 

}



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

 //IF NO STORES FOUND
    if ([self.annotationsToSort count] == 0) {
        NSLog(@"No results");
        cell.nameLabel.text = @"No results";
    }

    // Check to see whether the normal table or search results table is being displayed    
    //IF ITS A SEARCH TABLE....>>>>>>>>>
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        static NSString *CellIdentifier = @"HolidayCell";
        if (cell == nil) {
            cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
        }
        cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];

        Location *location = [filteredResultsArray objectAtIndex:indexPath.row];
        cell.nameLabel.text = location.nombrePublico;

    } else {

    // IF ITS A REGULAR TABLE...>>>>>>>>>>
        static NSString *CellIdentifier = @"HolidayCell";
        if (cell == nil) {
            cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
            //cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
        }
        cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];


        //USING SORTED ARRAY INSTEAD OF CDfetched ARRAY
        MyLocation *myLocation = [self.annotationsToSort objectAtIndex:indexPath.row];

        cell.nameLabel.text = myLocation.name;
        cell.dateLabel.text =  myLocation.address;
        cell.distancia.text = distance;
        cell.phoneLabel.text = myLocation.telefono;
        cell.openLabel.text = myLocation.estado;
        cell.driveThruLabel.text = myLocation.driveThru;

    }
    return cell;

}

为什么我的NO RESULTS单元格没有显示在我的表视图控制器中？

3 个答案: