如何让自定义UITableView自动滚动到选定的文本字段？

Question

我有一个UITableView,我从一个习惯控制UIViewController.当用户单击"添加"按钮时,我会在UITableView其中添加一行文本字段,并将其作为第一个响应者.问题是,当表的底部不在视图中(或被键盘隐藏)时,UITableView不会滚动以将文本字段带入视图.

UITableViewController自动执行此操作,但我的视图控制器不能是其子类UITableViewController.

Answer 1

我的摆弄这个固定contentInset的UITableView,当键盘出现或消失.

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

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

- (void)keyboardWasShown:(NSNotification *)aNotification {
    CGRect keyboardBounds;
    [[aNotification.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &keyboardBounds];
    keyboardHeight = keyboardBounds.size.height;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationBeginsFromCurrentState:YES];
    tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardBounds.size.height, 0);
    [UIView commitAnimations];
    [tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:[items count] inSection:0]
                     atScrollPosition:UITableViewScrollPositionMiddle
                             animated:YES];
}

- (void)keyboardWasHidden:(NSNotification *)aNotification {
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationBeginsFromCurrentState:YES];
    tableView.contentInset = UIEdgeInsetsZero;
    [UIView commitAnimations];
}

registerForKeyboardNotifications加载时调用UITableView,其他一切应该正常工作.