Question

我正在关注代码here

#pragma mark UITextFieldDelegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

    [textField resignFirstResponder];

    return YES;

}

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
    if ([sender isEqual:password])
    {
        //move the main view, so that the keyboard does not hide it.
        if  (self.view.frame.origin.y >= 0)
        {
            [self setViewMovedUp:YES];
        }
    }
}

//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5]; // if you want to slide up the view

    CGRect rect = self.view.frame;
    if (movedUp)
    {
        // 1. move the view's origin up so that the text field that will be hidden come above the keyboard 
        // 2. increase the size of the view so that the area behind the keyboard is covered up.
        rect.origin.y -= kOFFSET_FOR_KEYBOARD;
        rect.size.height += kOFFSET_FOR_KEYBOARD;
    }
    else
    {
        // revert back to the normal state.
        rect.origin.y += kOFFSET_FOR_KEYBOARD;
        rect.size.height -= kOFFSET_FOR_KEYBOARD;
    }
    self.view.frame = rect;

    [UIView commitAnimations];
}


- (void)keyboardWillShow:(NSNotification *)notif
{
    //keyboard will be shown now. depending for which textfield is active, move up or move down the view appropriately

    if ([password isFirstResponder] && self.view.frame.origin.y >= 0)
    {
        [self setViewMovedUp:YES];
    }
    else if (![password isFirstResponder] && self.view.frame.origin.y < 0)
    {
        [self setViewMovedUp:NO];
    }
}


- (void)viewWillAppear:(BOOL)animated
{
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardWillShowNotification object:self.view.window]; 
}

- (void)viewWillDisappear:(BOOL)animated
{
    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil]; 
}

当我点击密码UITextField时它实际上会移动视图，但是在我完成后它没有再次向下滚动。我在这里缺少什么？

Answer 1

您实现了keyboardWillShow。你还必须实现keyboardwillHide。

查看这篇文章：

Making a UITableView scroll when text field is selected

这对我很有用。

Answer 2

尝试

-(void)textFieldDidEndEditing:(UITextField *)sender
{
     // Your code to scroll down your view.
}

它已编写但尚未测试。

Answer 3

我不确定如何解决您的代码问题。但是，有一种简单的方法。您可能想尝试强烈推荐的“TPKeyboardAvoidingScrollView”：https://github.com/michaeltyson/TPKeyboardAvoiding

键盘存在问题时UITextField滚动

3 个答案: