display soft keyboard (iPad) when is connected a bluetooth input device

问题

I'm really bangin' my head because I can't find the way to show the soft keyboard when there's a bluetooth input device connected to the iPad. I made some search on the web and this is the result:

a question on stackoverflow with a very short answer How can I detect if an external keyboard is present on an iPad?
an application developed by erica sadun for the cydia env http://www.tuaw.com/2010/06/02/hacksugar-bringing-back-the-on-screen-keyboard/

Erica said that the trick is to answer to the system that "There's no hardware keyboard attached". I tried to write a category for UIKeyboardImpl and I overrided:

- (BOOL)isInHardwareKeyboardMode {
    DEBUG(@"is called");
    return NO;
}

But until now I haven't obtained anything. The overrided method is called but there's no soft keyboard. Erica also said the application works by dynamic linking but I don't know how can I accomplish it. I don't need to be in the AppStore because this is a private application so I don't bother about rejection.

Thanks in advance

回答1:

Ok. Finally got it. Many thanks to David, Matthias and Enrico. Here are the steps:

import the private framework GraphicsServices
call GSEventSetHardwareKeyboardAttached(NO) inside the viewDidLoad

add a button that toggles the keyboard by calling

static void toggleKeyboard(UIKeyboardImpl * keyImpl){
if (UIKeyboardAutomaticIsOnScreen()) {
    UIKeyboardOrderOutAutomatic();
} else {
    UIKeyboardOrderInAutomatic();
}

I've found this function on http://code.google.com/p/btstack/wiki/iPhoneKeyboardHiding Now I can take input from the soft keyboard and from the bluetooth device at the same time.

回答2:

To get around it using the apple keyboard you hit the eject key. Perhaps you can implement an action that sends the eject keycode? I think iSSH has a feature where you can tap the onscreen keyboard icon to bring it up even when a bluetooth keyboard is connected.

来源：https://stackoverflow.com/questions/4150724/display-soft-keyboard-ipad-when-is-connected-a-bluetooth-input-device

标签

iphone

objective-c

cocoa-touch

ipad

uikeyboard