如何找出UITextField导致UIKeyboardWillShowNotification的原因？ [英] How to find out what UITextField caused a UIKeyboardWillShowNotification?

问题描述

我正在尝试在我的应用程序中使用自定义键盘，但在尝试将其限制为一个特定的UITextField时遇到问题。

I am trying to use a customized keyboard in my application, but I am hitting problems when trying to restrict it to one particular UITextField.

我的代码基于此Xcode项目（最初在此博客）。该代码将自定义UIButton（表示小数点）添加到UIKeyboardTypeNumberPad键盘视图中。它通过订阅UIKeyboardWillShowNotification并在出现时修改键盘来实现。

I based my code on this Xcode project (originally found on this blog). That code adds a custom UIButton (representing a 'decimal point') into the UIKeyboardTypeNumberPad keyboard view. It does it by subscribing to UIKeyboardWillShowNotification and modifying the keyboard when it appears.

Xcode项目工作得很好，但是当我添加一个额外的UITextField时，自定义键被放入该文本字段的键盘，即使我为该文本字段选择了完全不同的键盘类型。

That Xcode project works great, but when I add an extra UITextField, the custom key gets put into the keyboard for that text field too, even though I have selected a completely different keyboard type for that text field.

我试图注册只看到来自一个的UIKeyboardWillShowNotification通知特别是UITextField，但似乎不起作用：

I attempted to register to only see UIKeyboardWillShowNotification notifications from the one particular UITextField, but that doesn't seem to work:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:exampleViewController.textField];

我还试图检查传递给keyboardWillShow的NSNotification里面的对象，但不幸的是它指的是键盘，而不是导致键盘出现的UI控件。

I also tried to inspect the object inside the NSNotification passed to keyboardWillShow, but unfortunately it refers to the keyboard, not the UI control that caused the keyboard to appear.

2009-10-21 19:50:22.205 Example[6302:207] NSConcreteNotification 0x321ebd0 {name = UIKeyboardWillShowNotification; userInfo = {
UIKeyboardAnimationCurveUserInfoKey = 0;
UIKeyboardAnimationDurationUserInfoKey = 0.300000011920929;
UIKeyboardBoundsUserInfoKey = NSRect: {{0, 0}, {320, 216}};
UIKeyboardCenterBeginUserInfoKey = NSPoint: {160, 588};
UIKeyboardCenterEndUserInfoKey = NSPoint: {160, 372};

}}

我是否误解了addObserver接口？当然必须有一种方法来订阅来自特定UI控件的通知吗？

Am I misunderstanding the addObserver interface? Surely there must be a way to subscribe to notifications from a particular UI control?

有没有人有关于如何实现此目的的任何其他建议？

Has anybody got any other suggestions on how to achieve this?

推荐答案

无法获得上述任何功能。不得不手动完成：

Couldn't get any of the above to work. Had to do it manually:

if ([companyName isFirstResponder]) {
    // ...............
}
else if ([notes isFirstResponder]) {
    //.............
    }
}

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