ios - 静态表视图 - 键盘隐藏的 UITextField

Question

也许这是一个反复出现的问题，但我被这个问题和一些 iOS 概念所困扰。我有一个带有静态表视图、三个部分和每个部分的一些行的ViewController 。在行内我有 UITextFields。我想要做的是阻止键盘隐藏我的底部屏幕 UI 文本字段。我刚刚尝试了管理键盘中的苹果解决方案，但是由于我没有将滚动视图背后的概念附加到静态表格视图中，因此我无法将这个想法实施到我的项目中。大家有没有推荐的地方学习呢？抱歉，如果无法解释我要做什么。我有点失落。

任何帮助将不胜感激。

非常感谢，马科斯。

Answer 1

我不得不做类似的事情，这是我的代码，希望它可以帮助你。

- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    CGRect aRect = self.bounds;
    aRect.size.height -= kbSize.height;
    CGRect activeRect = [activeTextField convertRect:activeTextField.frame toView:self];

    if (!CGRectContainsPoint(aRect, activeRect.origin) ) {
        CGPoint scrollPoint = CGPointMake(0.0, activeRect.origin.y-kbSize.height+10);
        [scrollView setContentOffset:scrollPoint animated:YES];
    }
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    self.activeTextField = textField;
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    self.activeTextField = nil;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return NO;
}

此外，请确保在加载视图时设置通知观察者，如下所示：

[[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(keyboardWasShown:)
                                                     name:UIKeyboardWillShowNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(keyboardWillBeHidden:)
                                                     name:UIKeyboardWillHideNotification object:nil];

只需将 activeTextField 定义为 UITextField 并确保您想要移动的所有内容都包含在您的 scrollView 中（在您的情况下，您可能可以将 viewController 更改为 scrollView）。另外，确保你的 scrollView 的 contentSize 至少是 self.bounds.size。

希望这可以帮助。

Answer 2

I just had to do this in my application - Stakenborg's answer got me 80% there, but there were a couple of additional refinements I added to work with TableViews specifically.

The main bits are that:

• TableViews already have insets, so we need to add or subtract from those.
• I also want to scroll so that the cell I'm editing is in a good place to be seen.

The second part requires a little bit of indirection - the text fields belong to my custom cells, so I need to respond to the BeginEditing message there by sending a message to the UITableViewController.

Here's how it all comes together. In the UITableViewController:

@property (nonatomic, strong) NSIndexPath *editCellIndexPath;
@property (nonatomic) bool keyboardShowing;

//....

- (void)setEditRow:(UITableViewCell *)cell
{
    self.editCellIndexPath = [self.tableView indexPathForCell:cell];
    if (self.keyboardShowing)
    {
        [self.tableView scrollToRowAtIndexPath:self.editCellIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:true];
    }
}

- (void)keyboardWillShow:(NSNotification *)sender
{
    CGSize kbSize = [[[sender userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    NSTimeInterval duration = [[[sender userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    UIEdgeInsets edgeInsets = [self.tableView contentInset];
    edgeInsets.bottom += kbSize.height;
    UIEdgeInsets scrollInsets = [self.tableView scrollIndicatorInsets];
    scrollInsets.bottom += kbSize.height;

    self.keyboardShowing = true;

    [UIView animateWithDuration:duration animations:^{
        [self.tableView setContentInset:edgeInsets];
        [self.tableView setScrollIndicatorInsets:scrollInsets];
    }];
}

- (void)keyboardWillHide:(NSNotification *)sender
{
    CGSize kbSize = [[[sender userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    NSTimeInterval duration = [[[sender userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    UIEdgeInsets edgeInsets = [self.tableView contentInset];
    edgeInsets.bottom -= kbSize.height;
    UIEdgeInsets scrollInsets = [self.tableView scrollIndicatorInsets];
    scrollInsets.bottom -= kbSize.height;

    self.keyboardShowing = false;

    [UIView animateWithDuration:duration animations:^{
        [self.tableView setContentInset:edgeInsets];
        [self.tableView setScrollIndicatorInsets:scrollInsets];
    }];
}

Then I have a weak property for the owningController in each of my custom UITableViewCells, and let the controller know when my cell is being text-edited. I use a TextView in one, and TextFields in another row, so I use these methods:

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    MyCustomTableController *itemControl = (MyCustomTableController *)self.owningController;
    [itemControl setEditRow:self];
}

and

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    MyCustomTableController *itemControl = (MyCustomTableController *)self.owningController;
    [itemControl setEditRow:self];
}

So far, this is working very well.