iPhoneX无导航栏页面适配

原全屏适配在iPhoneX会由于安全区域的变化导致显示不全。
解决方案如下：
在self.view上添加一个view，剩下的视图基于该view布局，view的约束随self.view.safeAreaInsets的改变需要重置：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor blackColor];

    if (@available(iOS 11, *)) {
        [self setAdditionalSafeAreaInsets:self.view.safeAreaInsets];
    }
    [self defaultUI];
    [self addNotification];
}

//iOS11新增，安全区域发生改变时调用
- (void)viewSafeAreaInsetsDidChange{
    [super viewSafeAreaInsetsDidChange];

    [self defaultUIWithSafeAreaInsets:self.view.safeAreaInsets];
}