想澄清一下是视图加载错误还是代码问题？

Question

很乐意协助澄清细节。我尝试通过 segue 输入应用内购买视图控制器并通过用户默认值将其关闭，但控制器不存在并且崩溃表明视图确实加载错误。因此，想澄清一下是视图加载错误还是代码问题？

override func viewDidLoad() {
    super.viewDidLoad()

    SKPaymentQueue.default().add(self)
    if isPurchased() {
        showDetails()
    }
}

override func prepare (for segue: UIStoryboardSegue, sender: Any?) {

     if segue.identifier == "subscribepage1" {
           buyPremium()
     } else if segue.identifier == "subscribepage2" {
            buyPremium()
     }
}

func isPurchased() -> Bool {
    let purchaseStatus = UserDefaults.standard.bool(forKey: productID)
    if purchaseStatus {
        print("Previously purchased")
        return true
    } else { print("Never purchased")
        return false
    }
}

func showDetails() {
    UserDefaults.standard.set(true, forKey: productID)
    performSegue(withIdentifier: "gotop1", sender: self)
    performSegue(withIdentifier: "gotop2", sender: self)
}

Answer 1

只有你的代码有问题，当你调用 showDetails() 方法同时执行两个 segues 时

performSegue(withIdentifier: "gotop1", sender: self)
performSegue(withIdentifier: "gotop2", sender: self)

验证/添加这两行的条件，“gotop1”或“gotop2”。