在UIWebView中调整iOS键盘高度的对比度

Question

我有一个简单的浏览器视图控制器用作故事板的一部分。 它开始看起来很棒。 我的UIToolBar通过垂直空间约束为0锚定到UIView的底部。

当你在打开键盘的网页上点击某些内容时。 UIToolBar是隐藏的。 所以我为键盘可见性更改添加了一个监听器，并根据键盘的高度调整了约束。 这似乎运作良好。

但是，如果用户然后按下键盘上的最小化按钮，则键盘不会完全消失。 允许在输入字段之间进行选项卡的顶部箭头键（我不知道该怎么称呼它）将保持可见。 所以我不能将我的约束设置回0，我必须根据可见键盘的高度再次设置它（我认为这将包括顶部栏）。

但是当我的UIKeyboardDidHideNotification触发时，键盘高度仍然相同，所以我最终会这样。

我移动约束的逻辑基于以这种方式获取键盘高度：

   // get height of visible keyboard
    NSDictionary* keyboardInfo = [aNotification userInfo];
    NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
    CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

    _toolbarBottomVerticalSpaceConstraint.constant = -1 * keyboardFrameBeginRect.size.height;

UIKeyboardFrameBeginUserInfoKey不是在键盘被隐藏的情况下使用的基础值吗？

此视图控制器的整个源实际上非常简单，所以我将包括所有这些，以防有人稍后要求它。

    #import "LEPopupBrowserViewController.h"

    @interface LEPopupBrowserViewController ()
    @property (weak, nonatomic) IBOutlet UIWebView *webView;
    @property (weak, nonatomic) IBOutlet NSLayoutConstraint *toolbarBottomVerticalSpaceConstraint;

    @end

    @implementation LEPopupBrowserViewController

    - (void)viewDidLoad {
        [super viewDidLoad];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];

        if (_url != nil) {
            NSMutableURLRequest * request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:_url]];
            [_webView loadRequest:request];
        }
    }

- (void) viewDidUnload {
    [[NSNotificationCenter defaultCenter]  removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter]  removeObserver:self name:UIKeyboardDidHideNotification object:nil];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

    // Called when the UIKeyboardDidShowNotification is sent.
    - (void)keyboardWillShow:(NSNotification*)aNotification
    {
        // get height of visible keyboard
        NSDictionary* keyboardInfo = [aNotification userInfo];
        NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
        CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

        _toolbarBottomVerticalSpaceConstraint.constant = -1 * keyboardFrameBeginRect.size.height;
    }

    // Called when the UIKeyboardWillHideNotification is sent
    - (void)keyboardDidHide:(NSNotification*)aNotification
    {
        // get height of visible keyboard
        NSDictionary* keyboardInfo = [aNotification userInfo];
        NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
        CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

        _toolbarBottomVerticalSpaceConstraint.constant = -1 * keyboardFrameBeginRect.size.height;
    }


    /*
    #pragma mark - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
        // Get the new view controller using [segue destinationViewController].
        // Pass the selected object to the new view controller.
    }
    */

    - (IBAction)doneButtonPressed:(id)sender {
        // close keyboard if present
        [self.view endEditing:YES];

        // dismiss ourselves
        [self dismissViewControllerAnimated:YES completion:nil];
    }

    @end

更新

我通过一些额外的研究发现这个额外的视图叫做accessoryView 。 我看到很多人试图删除它，但没有找到任何你可以轻松找到它的高度。 关于将它删除给我的麻烦部分似乎Apple可能拒绝您的应用程序。