How to reload a view controller when back from another view using tab bar

Question

I have a common view used when the user opens the app (VC1). With a tab bar controller, I load another view (VC2) that can be used to update data visible in the previous one. When I go back on VC1 (which is stack), it does not reload with updated data.

I have tried to call the viewDidLoad in the viewWillAppear like so...

override func viewWillAppear(_ animated: Bool) {
    viewDidLoad()
}

It works, but it loads over the VC1 still on stack and the user can see the change (not good).

I suppose that to dismiss the VC1 would help, but I haven't found how to dismiss a view when using tab bar controller.

Answer 1

请按照以下步骤操作，以在每次视图出现时查看视图负载设置：
（VC1 = First View Controller）

• viewLoadSetup在VC1中创建一个新的函数/方法（名为），然后将所有代码从viewDidLoad()移至viewLoadSetup()。

• 现在，呼叫viewLoadSetup()从viewWillAppear

  class VC1: UIViewController {
  
      override func viewDidLoad() {
         super.viewDidLoad()
         // viewLoadSetup()  you may call it from view did load also
      }
  
      override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
         viewLoadSetup()
  
      }
  
  
       func viewLoadSetup(){
        // setup view did load here
       }
  
  
  }
  

如果您想viewLoadSetup从viewDidLoad进行呼叫，则是在加载视图控制器时调用一次，viewWillAppear然后从那时开始，

class VC1: UIViewController {

    var isLoadingViewController = false

    override func viewDidLoad() {
        super.viewDidLoad()
        isLoadingViewController = true
        viewLoadSetup()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        if isLoadingViewController {
            isLoadingViewController = false
        } else {
            viewLoadSetup()
         }
    }


    func viewLoadSetup(){
      // setup view did load here
    }


}