如何检测iPad用户点击键盘隐藏按钮？

Question

In my app I have some complex logic surrounding the hiding and showing of the keyboard. I am interested in detecting when the user (who has an iPad) specifically taps on the iPad keyboard hide button:

I am not interested in detecting when the keyboard is supposed to hide, only when the user actually physically taps on this button. Any suggestions?

Thank you!

Answer 1

I was looking for an exact same solution, and I did found it in the documentation after all. You get a whole package of keyboard notifications:

- UIKeyboardWillShowNotification
- UIKeyboardDidShowNotification
- UIKeyboardWillHideNotification
- UIKeyboardDidHideNotification
- UIKeyboardWillChangeFrameNotification
- UIKeyboardDidChangeFrameNotification

I was interested in "UIKeyboardWillHideNotification". So just implemented:

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

Et voilà! Hope this helps, even it's an year late answer.

Answer 2

I don't think Apple allows that, I'm afraid.

But maybe you could create an invisible view ( view.opaque = FALSE; view.alpha = 0; ) that's placed just above the aforementioned button which receives touches as the first responder (so that you get the event) and then forwards it to the next (the keyboard). However, I don't know if it's possible to place a view above the keyboard, even "illegally".