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尝试呈现其视图不在窗口层次结构中的UINavigationController！ （迅速）

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即使调用viewcontrollers的函数似乎正在运行，我也遇到了我的viewcontrollers问题 . 我在控制台中收到的错误是：

警告：尝试显示其视图不在窗口层次结构中！

我已经尝试了关于“尝试在UIViewController上呈现UIViewController，其视图不在窗口层次结构中”的线程没有任何进展的建议 . 我以编程方式运行所有内容 .

func handleNewPage(){
    print("this code works")
    let uid = Auth.auth().currentUser?.uid

    ref = Database.database().reference()

    let usersReference = ref.child("patient").child((uid)!)

    if usersReference.child("Doctor Code") != nil {
        func presentNewPage(){
            let firstPage = LandingPage()
            let navCon = UINavigationController(rootViewController: firstPage)
            present(navCon, animated: true, completion: nil)

        }
        presentNewPage()
        print("PRINT")
    } else{
        let newPage = PresentViewController() // doctor reg page
        let navController = UINavigationController(rootViewController: newPage)
        present(navController, animated: true, completion: nil)
    }
}

调用该函数并且print语句有效 . 但是，视图控制器不会出现 .

ios swift uiviewcontroller

1 回答

  • 0

    你必须在 if 之外创建presentNewPage（）函数???

    if usersReference.child("Doctor Code") != nil {
        func presentNewPage(){
            let firstPage = LandingPage()
            let navCon = UINavigationController(rootViewController: firstPage)
            present(navCon, animated: true, completion: nil)

        }
    presentNewPage()
    print("PRINT")
} else{
    let newPage = PresentViewController() // doctor reg page
    let navController = UINavigationController(rootViewController: newPage)
    present(navController, animated: true, completion: nil)
}

    像这样改变它

    func presentNewPage(){
            let firstPage = LandingPage()
            let navCon = UINavigationController(rootViewController: firstPage)
            present(navCon, animated: true, completion: nil)

        }

func handleNewPage(){
    print("this code works")
    let uid = Auth.auth().currentUser?.uid

ref = Database.database().reference()

let usersReference = ref.child("patient").child((uid)!)

if usersReference.child("Doctor Code") != nil {

    presentNewPage()
    print("PRINT")
} else{
    let newPage = PresentViewController() // doctor reg page
    let navController = UINavigationController(rootViewController: newPage)
    present(navController, animated: true, completion: nil)
}
}
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