键盘出现或关闭时如何移动包含在 UIViewController 中的 UIView？

Question

我遇到的一个问题是，我想在键盘显示时将 UIView(footerview) 向上移动，并在键盘关闭时将其向下移动。

• 我的 UIView (FooterView) 包含在 Main.Storyboard 的 UIViewController 中，由 Xcode 自动生成。
• 我也有一个 TextField。

视图层次结构如下所示：

查看：

-->文本域

--> UIView(FooterView)

编辑：

在我发布这个问题后，我自己找到了答案

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
return YES;
}


- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];

[self.view endEditing:YES];
return YES;
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
}
- (void)keyboardDidShow:(NSNotification *)notification
{
// Assign new frame to view
[self.footerView setFrame:CGRectMake(0,250,320,65)];
}

-(void)keyboardDidHide:(NSNotification *)notification
{
// set it back to the original place
[self.footerView setFrame:CGRectMake(0,503,320,65)];
}

Answer 1

如果您使用自动布局，您可以为您的 UIView NSLayoutAttributeBottom 约束创建一个 IBOutlet，并在需要时更改它。如果没有，您必须移动您的视图框架。

例如：

- (void)keyboardWillShow:(NSNotification *)notification {
    // Get the size of the keyboard.
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    self.bottomConstraintKeyboard = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.writeView attribute:NSLayoutAttributeBottom multiplier:1 constant:keyboardSize.height];
     [self.view removeConstraint:self.bottomConstraintZero];
    [self.view addConstraint:self.bottomConstraintKeyboard];
    [UIView animateWithDuration:.5 animations:^{
        [self.view layoutIfNeeded];
    }];    
}

- (void)keyboardWillHide:(NSNotification *)notification {
    if (self.bottomConstraintKeyboard){
        [self.view removeConstraint:self.bottomConstraintKeyboard];
        self.bottomConstraintKeyboard = nil;
    }
    [self.view addConstraint:self.bottomConstraintZero];
    [UIView animateWithDuration:.5 animations:^{
        [self.view layoutIfNeeded];
    }];
}