的cellForRowAtIndexPath

Question

我正在尝试创建应用内设置表格视图，该视图需要具有不同内容的不同部分。我首先尝试了外面的所有代码（！cell），但这导致了滚动内容的重复，然后我发现了线程，它说我需要放入内部（！cell），但现在它没有显示任何内容。我做错了什么？

的cellForRowAtIndexPath

- (UITableViewCell *)tableView:(UITableView *)tableView
     cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MyIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];

if (!cell)
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                   reuseIdentifier:MyIdentifier];
    cell.backgroundColor = [UIColor colorWithRed:0.953 green:0.953 blue:0.965 alpha:1] ;
    self.emailTextField.delegate = self;


    self.cellName = [[UILabel alloc] initWithFrame:CGRectMake(20, 12, 42, 20)];
    self.cellName.textColor = [UIColor colorWithRed:0.137 green:0.145 blue:0.157 alpha:1];
    self.cellName.font = [UIFont fontWithName:@"HelveticaNeue" size:14];
    [cell.contentView addSubview:self.cellName];

    if (indexPath.section == 1) {
        cell.selectionStyle = UITableViewCellSelectionStyleNone;


        self.cellName.text = [notArray objectAtIndex:indexPath.row];

        if (indexPath.row == 0) {
            self.acceptanceSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.acceptanceSwitch];
        } else if (indexPath.row == 1) {
            self.messageSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.messageSwitch];
        } else if (indexPath.row == 2) {
            self.likeSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.likeSwitch];
        }
    } else if (indexPath.section == 0) {
        cell.selectionStyle = UITableViewCellSelectionStyleNone;

        self.cellName.text = [accountArray objectAtIndex:indexPath.row];


        if (indexPath.row == 0) {
            self.nameTextField = [[UITextField alloc] initWithFrame:CGRectMake(110, 7, 190, 30)];
            self.nameTextField.enabled = NO;
            [cell.contentView addSubview:self.nameTextField];
        } else if (indexPath.row == 1) {
            self.emailTextField = [[UITextField alloc] initWithFrame:CGRectMake(110, 7, 190, 30)];
            [cell.contentView addSubview:self.emailTextField];
            [self.emailTextField setReturnKeyType:UIReturnKeyDone];
            [self.emailTextField setKeyboardType:UIKeyboardTypeEmailAddress];
        } else if (indexPath.row == 2) {
            self.genderSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.genderSwitch];
        }



    }


}



if (indexPath.section == 0) {
    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    self.cellName.text = [accountArray objectAtIndex:indexPath.row];



} else if (indexPath.section == 1) {
    cell.selectionStyle = UITableViewCellSelectionStyleNone;


    self.cellName.text = [notArray objectAtIndex:indexPath.row];






} else if (indexPath.section == 2) {


    self.cellName.text = [policyArray objectAtIndex:indexPath.row];

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

} else if (indexPath.section == 3) {


    self.cellName.text = [buttonsArray objectAtIndex:indexPath.row];
    self.cellName.textAlignment = NSTextAlignmentCenter;

}



return cell;
}

Answer 1

请尝试以下方法：

使用公共属性（label，textfield）创建UITableViewCell的子类。如果您对不同部分的单元格有不同的要求，那么您可能应该有不同的单元格子类。
使用视图中的tableview注册这些单元类并加载。例如

[self.tableView registerClass：[MySectionOneTableViewCell class] forCellReuseIdentifier：MySectionOneIdentifier]; [self.tableView registerClass：[MySectionTwoTableViewCell class] forCellReuseIdentifier：MySectionTwoIdentifier];
在下面的方法中，只需在检查部分后将单元格出列并设置属性。
- （UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath ）indexPath { UITableViewCell 单元格; if（indexPath.section == 0）{ cell =（MySectionOneTableViewCell *）[tableView dequeueReusableCellWithIdentifier：MySectionOneIdentifier forIndexPath：indexPath; cell.textLabel = @＆＃34; foo＆＃34 ;;
  } 返回细胞; }
实现方法，准备在自定义uitableviewcell类中重用，初始化所有标签和文本字段。该方法准备单元的视图以供重用。 e.g。
- （void）prepareForReuse { self.textLabel.text = @＆＃34;＆＃34 ;; }

Answer 2

正如@rmaddy所提到的，你不应该在你的（！细胞）中提到细胞的产生。＆＃34;代码插图＆＃34;如下：

- (void)viewDidLoad {
    // This part wasn't included in any specific if/else condition dealing with cell properties (like section or row), not either being modified during the cell generation
    self.emailTextField.delegate = self;
    self.cellName = [[UILabel alloc] initWithFrame:CGRectMake(20, 12, 42, 20)];
    self.cellName.textColor = [UIColor colorWithRed:0.137 green:0.145 blue:0.157 alpha:1];
    self.cellName.font = [UIFont fontWithName:@"HelveticaNeue" size:14];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *MyIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];

    // This part ensure you will initiate each cell with the correct identifier
    if (!cell)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
        cell.backgroundColor = [UIColor colorWithRed:0.953 green:0.953 blue:0.965 alpha:1] ;
    }

    [cell.contentView addSubview:self.cellName];

    // You should check your code and commute the common condition together
    if (indexPath.section == 0) {
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        self.cellName.text = [accountArray objectAtIndex:indexPath.row];

        // Be aware that your first section will contain only 3 rows
        if (indexPath.row == 0) {
            self.nameTextField = [[UITextField alloc] initWithFrame:CGRectMake(110, 7, 190, 30)];
            self.nameTextField.enabled = NO;
            [cell.contentView addSubview:self.nameTextField];
        } else if (indexPath.row == 1) {
            self.emailTextField = [[UITextField alloc] initWithFrame:CGRectMake(110, 7, 190, 30)];
            [cell.contentView addSubview:self.emailTextField];
            [self.emailTextField setReturnKeyType:UIReturnKeyDone];
            [self.emailTextField setKeyboardType:UIKeyboardTypeEmailAddress];
        } else if (indexPath.row == 2) {
            self.genderSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.genderSwitch];
        }
    } else if (indexPath.section == 1) {
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        self.cellName.text = [notArray objectAtIndex:indexPath.row];

        // Be aware that your second section will contain only 3 rows
        if (indexPath.row == 0) {
            self.acceptanceSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.acceptanceSwitch];
        } else if (indexPath.row == 1) {
            self.messageSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.messageSwitch];
        } else if (indexPath.row == 2) {
            self.likeSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(251, 6, 31, 51)];
            [cell.contentView addSubview:self.likeSwitch];
        }
    } else if (indexPath.section == 2) {
        // Here you are not adding any specific content to your section 2
        self.cellName.text = [policyArray objectAtIndex:indexPath.row];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    } else if (indexPath.section == 3) {
        // The same, your fourth section won't content any specific content
        // You should add something like [cell addSubview:MyCustomView]
        self.cellName.text = [buttonsArray objectAtIndex:indexPath.row];
        self.cellName.textAlignment = NSTextAlignmentCenter;

    }

    return cell;
}

正如我在评论中提到的，如果您的本地属性（cellName，nameTextField，genderSwitch等）得到很好的实施，那么您只需要6行你的桌子（第一部分为3，第二部分为3。你的第三和第四部分是空的，因为你没有提及其中的任何子视图。

最后，既然你的代码对我来说有很多困惑，我可能会在我的重写中犯了一些错误，所以在这种情况下请随时纠正我。

跳跃它将有助于你的工作。

Tableview没有显示任何数组

的cellForRowAtIndexPath

2 个答案: