ios - 当设备方向改变时，自定义键盘高度不会改变

Question

每当我旋转设备时，我的自定义键盘高度始终保持不变。我尝试删除 Constraints 并再次添加它，但没有成功。我已经在 Stack Overflow 和 iOS 开发论坛上查看了很多相关问题，但我仍然没有解决方案..

我读了一些使用过的应用程序 -(void)viewDidAppear:(BOOL)animated 但是一旦我使用这段代码设置了大小:

-(void)viewDidAppear:(BOOL)animated {

     [super viewDidAppear:animated];
    [self updateCustomHeight]; 
}


-(void)updateCustomHeight
{

    [self updateViewConstraints];
    CGFloat _expandedHeight = 250;

    NSLayoutConstraint *_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant:_expandedHeight];

    [self.view removeConstraint: _heightConstraint];
     [self.view layoutIfNeeded];

    if(isPortrait)
    {



        CGFloat _expandedHeight = 230;

        NSLayoutConstraint *_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: _expandedHeight];

        [self.view addConstraint: _heightConstraint];

    }
    else
    {

        CGFloat _expandedHeight = 200;

        NSLayoutConstraint *_heightConstraint = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: _expandedHeight];

        [self.view addConstraint: _heightConstraint];
    }

}

但是当我加载自定义键盘时，设置第一次设置框架显示为横向和纵向。

纵向:

风景:

我在我的方向更改委托(delegate)时调用该更改大小方法:

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    if([UIScreen mainScreen].bounds.size.width < [UIScreen mainScreen].bounds.size.height){
        //Keyboard is in Portrait
        isPortrait=YES;

        [self LoadKeyboardview];
         [self updateCustomHeight];

    }
    else{

        isPortrait=NO;

        [self LoadKeyboardview];
         [self updateCustomHeight];

        //Keyboard is in Landscape
    }


}

注意:

对于键盘布局，我正在使用 XIB 并将 nib 加载为标准设备方向，所有这些都工作正常，但在设备方向中更新大小将无法正常工作。请帮我解决这个问题

Answer 1

当您添加高度约束时，您需要将其保存在一个属性中，以便您随后可以将其删除。

@property (strong,nonatomic) NSLayoutConstraint *heightConstraint;

-(void)updateCustomHeight
{

    [self updateViewConstraints];
    CGFloat expandedHeight = 250;

    if (self.heightConstraint != nil) {
        [self.view removeConstraint:self.heightConstraint];
        [self.view layoutIfNeeded];

    if(isPortrait)
    {
       expandedHeight = 230;
    }
    else
    {

       expandedHeight = 200;
    }

    self.heightConstraint = [NSLayoutConstraint constraintWithItem:self.view      attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:0.0 constant: expandedHeight];
    [self.view addConstraint:self.heightConstraint];
    [self.view layoutIfNeeded];
}