当键盘出现或解除时,如何移动UIViewController中包含的UIView?

时间:2015-04-20 09:30:16

标签: ios uiview uikeyboard

我遇到的一个问题是,我想在键盘显示时向上移动我的UIView(footerview)并在键盘被解除时将其向下移动。

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

查看层次结构将如下所示:

查看:

- > TextField的

- >的UIView(FooterView)

修改

发布此问题后,我找到了自己的回答

-(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)];
}

1 个答案:

答案 0 :(得分:0)

如果您使用的是Autolayout,您可以为UIView NSLayoutAttributeBottom约束创建一个IBOutlet,并在需要时进行更改。如果没有,则必须移动视图框架。

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];
    }];
}