IQKeyboardManager: IQKeyboardManager enable = YES but not working

in LoginViewController.m

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self keyboardManagerEnabled];
}

- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    NSLog("enable:%i", [IQKeyboardManager sharedManager].enable);// print enable:1
    [self keyboardManagerEnabled];
}

- (void) viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [self keyboardManagerDisabled];
}

in UIViewController+Util.m

- (void)keyboardManagerEnabled{
    IQKeyboardManager *manager = [IQKeyboardManager sharedManager];
    if (!manager.enable) {
        manager.enable = YES;
        manager.enableAutoToolbar = YES;
        manager.shouldShowTextFieldPlaceholder = NO;
    }
}

- (void)keyboardManagerDisabled{
    IQKeyboardManager *manager = [IQKeyboardManager sharedManager];
    if (manager.enable) {
        manager.enable = NO;
        manager.enableAutoToolbar = NO;
    }
}

Now I do not know what happened, it does not work.Is my Xcode6 configuration problem?