当键盘不隐藏文本字段时移动视图

Question

在我的应用程序中，当我单击文本字段时，键盘会将其隐藏。请帮帮我——当我点击文本字段时，如何向上移动我的视图。我在textFieldDidBeginEditing:使用这个代码

self.tableView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 0, 216, 0);
self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 216, 0);

但它不起作用。

Answer 1

您不应该相信textFieldDidBeginEditing: 会针对键盘进行调整，因为即使用户使用不会显示屏幕键盘的物理键盘键入，也会调用此方法。

改为收听UIKeyboardWillShowNotification，它仅在实际显示键盘时触发。您需要执行三个步骤：

1. 从通知userInfo 字典中确定键盘的实际大小。大小会因横向/纵向以及不同的设备而有所不同。
2. 使用确定的大小更新contentInset。您可以制作动画，通知甚至会告诉您键盘动画的持续时间。
3. 将文本字段滚动到视图中，很容易忘记这一点！

您可以从here找到更多信息和示例代码

Answer 2

您可以执行以下操作，但首先确保您已将 UITextField 委托设置为您自己并且

#define kOFFSET_FOR_KEYBOARD 350;

在顶部。这是您希望视图移动的距离

//method to move the view up/down whenever the keyboard is shown/dismissed

-(void)setViewMovedUp:(BOOL)movedUp
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3]; // if you want to slide up the view
    [UIView setAnimationBeginsFromCurrentState:YES];

    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.

        if (rect.origin.y == 0 ) {
            rect.origin.y -= kOFFSET_FOR_KEYBOARD;
            //rect.size.height += kOFFSET_FOR_KEYBOARD;
        }

    }
    else
    {
        if (stayup == NO) {
            rect.origin.y += kOFFSET_FOR_KEYBOARD;
            //rect.size.height -= kOFFSET_FOR_KEYBOARD;
        }
    }
    self.view.frame = rect; 
    [UIView commitAnimations];
}


- (void)keyboardWillHide:(NSNotification *)notif {
    [self setViewMovedUp:NO];
}


- (void)keyboardWillShow:(NSNotification *)notif{
    [self setViewMovedUp:YES];
}


- (void)textFieldDidBeginEditing:(UITextField *)textField {
    stayup = YES;
    [self setViewMovedUp:YES];
}


- (void)textFieldDidEndEditing:(UITextField *)textField {
    stayup = NO;
    [self setViewMovedUp:NO];
}

- (void)viewWillAppear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardWillShowNotification object:self.view.window];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) 
                                                 name:UIKeyboardWillHideNotification object:self.view.window];
}

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