如何在鍵盤出現或關閉時移動包含在UIViewController中的UIView？

Question

我得到一個問題是，我想在鍵盤顯示時向上移動我的UIView（footerview），並在鍵盤被解散時將其移下。

• 我的UIView（FooterView）包含在由Xcode自動生成的Main.Storyboard中的UIViewController中。
• 我也有一個TextField。

視圖層次的樣子：

查看：

- >文本字段

- >的UIView（FooterView）

編輯：

後我發佈這個問題，我發現我自己的回答

-(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Autolayout，您可以創建一個IBOutlet到您的UIView NSLayoutAttributeBottom約束，並在需要時進行更改。如果沒有，你必須移動你的視圖框架。

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]; 
    }]; 
}