IOS navigationController?.popToRootViewController有错

Question

@IBAction func addInformation(_ sender: UIBarButtonItem) {
    // check rateHourly has value
    if let editedRateHourly = rateHourly.text {
        print("editedRateHourly condition is \(editedRateHourly)")
        if editedRateHourly != ""{
            print("not nil")
            // check edit value is number?
            let num = Int(editedRateHourly)
            if num != nil {
                print("is num")
                // add to database
                UserDefaults.standard.set(editedRateHourly, forKey: "\(findDate())")
                UserDefaults.standard.synchronize()
                // back to last viewController
                navigationController?.popToRootViewController(animated: true)
            }else{
                print("not num")
                print("error alert push!!")
                popErrorAlert()
            }
        }else {
            print("nil")
            print("editedRateHourly condition is nil")
            popErrorAlert()
        }
    }
}
@IBAction func cannelInformationPage(_ sender: UIBarButtonItem) {
    navigationController?.popToRootViewController(animated: true)
}

我想创建一个新的简单编辑页面。这对我来说是两个问题，当我完成版本时，if-else 将检查条件是否正确，然后保存数据 popToRootViewControlle。当我完成编辑时，我单击“addInformation”BarButtonItem，但我的 UI 出错了。另一个错误是当我点击 editField 但我没有输入任何条件时。然后我点击“cannelInformationPage”UIBarButtonItem。它也会出错。

It's what I get wrong

wrong information

Answer 1

因为它返回 Bool

_ = navigationController?.popToRootViewController(animated: true)