ios - 将 UITableView 滚动到顶部无法正确滚动

Question

我的 UIViewController 拆分为 2:

1. 界面 View
2. UITableView

为了隐藏表格的其余部分，我在表格中添加了一个页脚 View 。由于我不能使用静态单元格，也不能隐藏表格的所有底部 View ，所以我做得有点棘手。

但是当我正确点击我的文本字段时，表格 View 没有滚动到顶部。

键盘隐藏了 UITextField 并且没有滚动到正确的位置。

我该如何解决？

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return 6;
}

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

    if (indexPath.row == 0) identifier = @"cell_name";
    else if (indexPath.row == 1) identifier = @"cell_password";
    else if (indexPath.row == 2) identifier = @"cell_password_verify";
    else if (indexPath.row == 3) identifier = @"cell_email";
    else if (indexPath.row == 4) identifier = @"cell_cellphone";
    else if (indexPath.row == 5) identifier = @"cell_social";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];
    if (cell == nil) cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];

    return cell;
}

- (void)configureUI
{
    UIView *tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth([UIScreen mainScreen].bounds), 1)];
    tableFooterView.backgroundColor = [UIColor whiteColor];
    self.tableView.tableFooterView = tableFooterView;
    tableFooterView.backgroundColor = [UIColor whiteColor];
    self.tableView.tableFooterView = tableFooterView;

    self.edgesForExtendedLayout = UIRectEdgeNone;
    self.extendedLayoutIncludesOpaqueBars = NO;
    self.automaticallyAdjustsScrollViewInsets = NO;
}

更新:

问题是， ScrollView 无法滚动，因为 tableFooterView 太短了，然后我修改了我的代码。基本上，@Roger Nolan 是的，我还添加了以下代码，现在它可以完美运行:

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    UITableViewCell *cell = (UITableViewCell *)textField.superview.superview.superview;
    [self.tableView scrollToRowAtIndexPath:[self.tableView indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

- (void)registerObservers
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardDidShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardDidHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];
}

- (void)keyboardDidShow:(NSNotification *)notification
{
    CGFloat keyboardHeight = [CoreGraphicsHandler keyboardFramFromNotification:notification].size.height;

     UIView *tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth([UIScreen mainScreen].bounds), keyboardHeight)];
     tableFooterView.backgroundColor = [UIColor whiteColor];
     self.tableView.tableFooterView = tableFooterView;
}

- (void)keyboardDidHide:(NSNotification *)notification
{

    UIView *tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth([UIScreen mainScreen].bounds), 1)];
    tableFooterView.backgroundColor = [UIColor whiteColor];
    self.tableView.tableFooterView = tableFooterView;
}

Answer 1

您需要让 Controller 成为您的文本字段的委托(delegate)，然后发送 tableview scrollToRowAtIndexPath:atScrollPosition: animated:

请看这个完全相同的骗局:Making a UITableView scroll when text field is selected