iOS TouchScreenKeyboard closes and open when tapping on another InputField

link textI've worked around this by tapping into XCode and changing Unity's original behavior regarding UI. Not sure if this would work on other situations, but it's good enough for me.

Here's what I did:

On Keyboard.mm

1) Search for "- (void)hide" (line 229 on my case) and edit such function to add a return so its ignored, like so:

 - (void)hide
 {
     // modified by nico
     return;
     
     [self hideUI];
     _done = YES;
 }

2) Right below such function, create another with a different name:

 - (void)IA_hide
 {
     [self hideUI];
     _done = YES;
 }

3) Search for function UnityKeyboard_Hide() and above create another function like so:

 extern "C" void IA_HideTouchScreenKeyboard()
 {
     // do not send hide if didnt create keyboard
     // TODO: probably assert?
     if(!_keyboard)
         return;
     
     [[KeyboardDelegate Instance] IA_hide];
 }

4) Replace "[self hide];" with "[self IA_hide];" on the following functions: textFieldShouldReturn, textInputDone and textInputCancel.

On UnityInterface.h

5) Search for "UnityKeyboard_Hide" (line 302 on my case) and add the following row below:

 void IA_HideTouchScreenKeyboard();

On your Unity C# script (can easily be ported to JS)

6) Declare the IA_HideTouchScreenKeyboard() function at the beginning of your class:

 [DllImport ("__Internal")]
 private static extern void IA_HideTouchScreenKeyboard();

7) Then, simply call IA_HideTouchScreenKeyboard() whenever you want to close the keyboard.

Keep in mind Keyboard will not close automatically now when you, for example, tap outside the InputField. But it will close if you tap the close button on the keyboard or hit the Done button. So, you may want to call IA_HideTouchScreenKeyboard() on your InputField End Edit event, and on any other situation where you may want to close the keyboard.

I'm sure there's a much more elegant way to do this rather than simply blocking the keyboard hiding entirely, but I don't have much time and it works on my case.

Hope this helps someone.