使用IOS 8编辑时，键盘会间歇性地消失 [英] Keyboard intermittently disappears when editing using IOS 8

问题描述

我有几个案例，测试人员报告说，只要他们开始在我的应用程序的某些字段中输入键盘，键盘就会消失。我使用模拟器跟踪流程，并在手机上进行调试时，问题没有发生。然而，当我在一个不受限制的手机上尝试它时，它发生得相当一致。

I had several cases where testers reported that the keyboard would disappear whenever they started typing in some fields in my app. I traced the flow using the simulator and while debugging on a phone and the problem didn't occur, ever. However, when I tried it on an untethered phone it happened fairly consistently.

这是一些相关的代码。所有这些都是在用户点击文本字段外时隐藏键盘。我的UIViews是我的Touchview类的子类，它接收所有触摸：

Here's some pertinent code. All of this is to hide the keyboard when a user taps outside a textfield. My UIViews are subclasses of my Touchview class, which receives all touches:

TouchView.h：

TouchView.h:

@protocol TouchViewDelegate <NSObject>

-(UIView *) handleTouches:(NSSet *)touches withEvent:(UIEvent *)event inView:(UIView *) view;

@end

@interface TouchView : UIScrollView

@property (nonatomic, strong) id <TouchViewDelegate> touchDelegate;

@end

TouchView.m：

TouchView.m:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView * touchedView = [super hitTest:point withEvent:event];
    NSSet* touches = [event allTouches];
    [self.touchDelegate handleTouches:touches withEvent:event inView:touchedView];
    return touchedView;

}

我配置了主视图作为Touchview并将其包含在viewDidLoad中：

I configured the main view as a Touchview and included this in the viewDidLoad:

- (void)viewDidLoad
{
[super viewDidLoad];

HMWTouchView * touchView = (HMWTouchView*) self.view;

touchView.touchDelegate = self;
...
}

这是委托方法的实现：

-(UIView *) handleTouches:(NSSet *)touches withEvent:(UIEvent *)event inView:(UIView *) hitView {

if (![hitView isKindOfClass:[UIButton class]]) {
    [[UIResponder firstResponder] resignFirstResponder];
}
return self.view;
}

这看起来至少是IOS 8如何响应点击率的变化。

This looks like it is at least a change in how IOS 8 responds to hits.

推荐答案

我发现了同样的问题 - 当用户试图键入键盘时键盘被解除。

I observed the same problem - the keyboard gets dismissed when the user tries to type on it.

我的解决方案是一种解决方法。为了解决这个问题，我在键盘下面创建了一个虚拟的空UIView。此虚拟视图吸收并消耗敲击事件，键盘不会被解除。我在UIKeyboardDidShowNotification上创建视图，并在UIKeyboardWillHideNotification上将其删除。这解决了问题，并且适用于屏幕方向更改。

My solution is a workaround. To solve the problem I create a dummy empty UIView underneath the keyboard. This dummy view absorbs and consumes tap events and the keyboard is not dismissed. I create the view on the "UIKeyboardDidShowNotification" and remove it on "UIKeyboardWillHideNotification". This gets rid of the problem and works well with screen orientation changes.

以下是我的视图控制器中的代码，其中包含显示键盘的文本字段：

Here is the code in my view controller that contains the text fields that show up the keyboard:

/** Dummy view placed underneath the keyboard to prevent its dismissal. */
@property(nonatomic, strong) UIView *dummyView;

在 viewDidLoad 方法中，我们注册了键盘显示/隐藏通知：

In the viewDidLoad method we register for keyboard show/hide notifications:

// keyboard notifications - we need this to prevent keyboard dismissal
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWasShown:)
                                             name:UIKeyboardDidShowNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillBeHidden:)
                                             name:UIKeyboardWillHideNotification object:nil];

然后，在收到'键盘显示'通知后，我们在键盘下方创建虚拟视图：

Then, after receiving the 'keyboard shown' notification we create the dummy view underneath the keyboard:

- (void)keyboardWasShown:(NSNotification*)notification {
    // we need this to prevent keyboard dismissal    
    NSDictionary* info = [notification userInfo];
    CGRect keyboardFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    keyboardFrame = [self.view convertRect:keyboardFrame fromView:nil];
    self.dummyView = [[UIView alloc] initWithFrame:keyboardFrame];
    [self.view addSubview:self.dummyView];
}

...并在隐藏键盘时删除它：

... and remove it when the keyboard is hidden:

- (void)keyboardWillBeHidden:(NSNotification*)notification {
    [self.dummyView removeFromSuperview];
    self.dummyView = nil;
}

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