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myell0w/externalKeyboard.m

Last active September 17, 2025 04:02
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Revisions

  1. myell0w revised this gist Jan 29, 2015. 1 changed file with 16 additions and 1 deletion.
    17 changes: 16 additions & 1 deletion externalKeyboard.m
    View file
    Original file line number Diff line number Diff line change
    @@ -1,4 +1,5 @@
    - (BOOL)_isExternalKeyboardAttached
    // direct check for external keyboard
    + (BOOL)_isExternalKeyboardAttached
    {
    BOOL externalKeyboardAttached = NO;

    @@ -31,4 +32,18 @@ - (BOOL)_isExternalKeyboardAttached
    }

    return externalKeyboardAttached;
    }

    // observe change of external keyboard
    + (void)_registerForExternalKeyboardChangeNotification
    {
    CFNotificationCenterRef notificationCenter = CFNotificationCenterGetDarwinNotifyCenter();
    if (notificationCenter != NULL) {
    CFNotificationCenterAddObserver(notificationCenter, NULL, MNExternalKeyboardStatusDidChange, CFSTR("GSEventHardwareKeyboardAttached"), NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
    }
    }

    static void MNExternalKeyboardStatusDidChange(CFNotificationCenterRef notificationCenter, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
    {
    // external keyboard state changed…
    }
  2. myell0w created this gist Jan 29, 2015.
    34 changes: 34 additions & 0 deletions externalKeyboard.m
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,34 @@
    - (BOOL)_isExternalKeyboardAttached
    {
    BOOL externalKeyboardAttached = NO;

    @try {
    NSString *keyboardClassName = [@[@"UI", @"Key", @"boa", @"rd", @"Im", @"pl"] componentsJoinedByString:@""];
    Class c = NSClassFromString(keyboardClassName);
    SEL sharedInstanceSEL = NSSelectorFromString(@"sharedInstance");
    if (c == Nil || ![c respondsToSelector:sharedInstanceSEL]) {
    return NO;
    }

    #pragma clang diagnostic push
    #pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    id sharedKeyboardInstance = [c performSelector:sharedInstanceSEL];
    #pragma clang diagnostic pop

    if (![sharedKeyboardInstance isKindOfClass:NSClassFromString(keyboardClassName)]) {
    return NO;
    }

    NSString *externalKeyboardSelectorName = [@[@"is", @"InH", @"ardw", @"areK", @"eyb", @"oard", @"Mode"] componentsJoinedByString:@""];
    SEL externalKeyboardSEL = NSSelectorFromString(externalKeyboardSelectorName);
    if (![sharedKeyboardInstance respondsToSelector:externalKeyboardSEL]) {
    return NO;
    }

    externalKeyboardAttached = ((BOOL ( *)(id, SEL))objc_msgSend)(sharedKeyboardInstance, externalKeyboardSEL);
    } @catch(__unused NSException *ex) {
    externalKeyboardAttached = NO;
    }

    return externalKeyboardAttached;
    }