tabbar重影问题

1.未清除原来子控件

-(void)viewWillLayoutSubviews{

    [super viewWillLayoutSubviews];

    for (UIView *child in self.tabBar.subviews) {

        if ([child isKindOfClass:NSClassFromString(@"UITabBarButton")]) {

            [child removeFromSuperview];

        }

    }

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    // 移除之前的4个UITabBarButton

    for (UIView *child in self.tabBar.subviews) {

        if ([child isKindOfClass:[UIControl class]]) { //UITabBarButton

            [child removeFromSuperview];

        }

    }

}

-(void)DeletemoreMore{

    for (UIView *child in self.tabBar.subviews) {

        if ([child isKindOfClass:[UIControl class]]) { //UITabBarButton

            [child removeFromSuperview];

        }

    }

}

2.rootViewController title命名原因，应为self.navigationItem.title = @"***";而非self.title = @"***";