iOS导航栏动画异常或黑底bug

RT,做了几年开发,也确实没注意这一点,但是经常可以遇到在我们隐藏导航栏后左滑返回(或者tabbar切换VC时候)会看到异常黑色背景或异常动画效果,废话不多说,上代码.
早期写隐藏Nav总是这样写 错误的!!!

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:YES];
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated: YES];
}

其实应该...这样

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated: animated];
}

这样就解决了动画与背景异常的问题.
也算是记录一次自己的bug日志吧!