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Detect if there's an external keyboard attached (iOS)
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// direct check for external keyboard | |
+ (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; | |
} | |
// 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… | |
} |
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