Ios 使用导航栏返回

您好，我在Viewcontroller B中，带有导航栏，按下Viewcontroller B中的按钮将转到Viewcontroller C我不希望在Viewcontroller C中使用导航栏

let vc = self.storyboard?.instantiateViewController(withIdentifier: "viewC") as! ViewcontrollerC
    vc.passAction = "saveedit"
    vc.passName = passName
    self.present(vc, animated: true, completion: nil)

当我单击ViewcontrollerC中的保存按钮时，我应该使用ViewcontrollerB导航栏返回ViewcontrollerB

let vc = self.storyboard?.instantiateViewController(withIdentifier: "viewB") as! ViewcontrollerB
            vc.passName = "\(firstNameTxt.text!)\(" ")\(lastNameTxt.text!)"
             self.present(vc, animated: false, completion: nil)

这里的问题是，当我返回ViewcontrollerB时，我没有看到导航栏

编辑

//视图控制器

protocol UpdateDataDelegate {
    func loadData()
}
 class Viewcontroller C {
 var delegate: UpdateDataDelegate?

 override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.isNavigationBarHidden = true
    }

fun click_save() {
self.navigationController?.popViewController(animated: true)
 self.delegate?.loadData()
}

---

}试试这个。。在viewControllerC的ViewWillDisplay中取消隐藏导航栏，并在viewControllerB的ViewWillDisplay中隐藏导航栏

//ViewController C
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.isNavigationBarHidden = true
}

//ViewController B
 override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated);
self.navigationController?.isNavigationBarHidden = false
}

试试这个吧

//ViewController C
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
 self.navigationController?.setNavigationBarHidden(true, animated: true)
}

//ViewController B
 override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated);
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}

---

您似乎创建了一个新的ViewcontrollerB。 尝试此操作返回ViewcontrollerB

self.dismiss(animated: true, completion: nil)

---

为什么不按下“保存”按钮就关闭ViewcontrollerC呢

在ViewcontrollerC中：

这会将您移回ViewControllerB，其中导航栏已经存在

---

您不需要在任何地方隐藏/显示导航栏，无论是在显示ViewControllerC时，还是在关闭它时。

尝试使用导航控制器显示它

let vc = self.storyboard!.instantiateViewController(withIdentifier: "viewC") as! ViewcontrollerC
let navController = UINavigationController(rootViewController: vc)
self.present(navController, animated:true, completion: nil)

并在ViewcontrollerC的ViewWillAspect方法中添加以下行

override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.isNavigationBarHidden = true
}

override func viewWillDisAppear(_ animated: Bool) {
super.viewWillDisAppear(animated)
self.navigationController?.isNavigationBarHidden = false
}

当从ViewcontrollerC的ViewWillEnglish方法离开时

override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.isNavigationBarHidden = true
}

override func viewWillDisAppear(_ animated: Bool) {
super.viewWillDisAppear(animated)
self.navigationController?.isNavigationBarHidden = false
}

---

我刚刚在github上发布了UINavigationBar外观管理专用代码。看看吧，它会优雅地解决你的问题。 使用RRViewControllerExtension，您只需覆盖viewcontroller中的方法

//override any of the methods below in your viewcontroller's .m file to make specific navigation bar appearance

-(BOOL)prefersNavigationBarHidden;
-(BOOL)prefersNavigationBarTransparent;

-(nullable UIColor *)preferredNavatationBarColor;
-(nullable UIColor *)preferredNavigationItemColor;
-(nullable UIImage *)preferredNavigationBarBackgroundImage;
-(nullable NSDictionary *)preferredNavigationTitleTextAttributes;

---

是否将viewcontroller嵌入导航controller@Anbu.Karthik是的，在故事板中，它与导航控制器的连接，但在这里，您不能将数据发送到以前的控制器。我想将我在ViewcontrollerC中添加的新数据发送到ViewcontrollerB。您可以为此使用闭包，并在完成Disclose方法时调用该闭包。请检查我编辑的问题。我不明白我不明白你的代码你想做什么。请不要一次又一次地问同样的问题。我已经回答了你的问题：