Is UIKeyboard Loaded

KeyboardLoadedViewController.m

@property BOOL isKeyboardLoaded;

- (void)viewDidLoad {
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillChange:)
                                                 name:UIKeyboardWillChangeFrameNotification
                                               object:nil];
}

- (void)keyboardWillChange:(NSNotification *)notification {
    //https://stackoverflow.com/questions/22549911/why-is-uikeyboardwillshownotification-called-every-time-another-textfield-is-sel
    //키보드 이벤트 발생할때 키보드 프레임변화가 있는지 or 키보드가 떠있는지 확인
    CGRect beginFrame = [[notification.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    CGRect endFrame = [[notification.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    
    if(CGRectEqualToRect(beginFrame, endFrame) == YES) {
        logD(@"keyboardFrame isn't changing");
        _isKeyboardLoaded = NO;
        return;
    }
    _isKeyboardLoaded = YES;
}