这是我收到的确切错误消息：
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[< Deetox.StoreViewController 0x102640610 > setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key Label2.'
我创建了一个信息按钮，可以将用户带到我的应用的商店页面，但是当我点击信息按钮时，它会崩溃。你们知道为什么吗？我该如何解决？非常感谢！ ;）
这是我在StoreViewController上的代码：
import UIKit
import StoreKit
class StoreViewController: UIViewController, SKPaymentTransactionObserver, SKProductsRequestDelegate {
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
}
@IBOutlet var Label1: UILabel!
@IBOutlet var Button1: UIButton!
@IBOutlet var Button2: UIButton!
@IBOutlet var BuyButton: UIButton!
@IBOutlet var ProductTitle: UILabel!
@IBOutlet var ProductDescription: UITextView!
var Product: SKProduct?
var ProductID = "co.AytacEren.Deetox.RemoveAds"
override func viewDidLoad() {
super.viewDidLoad()
Label1.layer.cornerRadius = 5.0
Button1.layer.cornerRadius = 5.0
Button2.layer.cornerRadius = 5.0
BuyButton.layer.cornerRadius = 5.0
BuyButton.isEnabled = false
SKPaymentQueue.default().add(self)
getPurchaseInfo()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func DismissView(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
}
@IBAction func Purchase(_ sender: Any) {
let Payment = SKPayment(product: Product!)
SKPaymentQueue.default().add(Payment)
}
@IBAction func Restore(_ sender: Any) {
SKPaymentQueue.default().restoreCompletedTransactions()
}
func getPurchaseInfo() {
if SKPaymentQueue.canMakePayments() {
let request = SKProductsRequest(productIdentifiers: NSSet(objects: self.ProductID) as! Set<String>)
request.delegate = self
request.start()
}
else {
ProductTitle.text = "Warning"
ProductDescription.text = "Please enable In-App Purchase in your settings"
}
}
func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
var products = response.products
if (products.count == 0) {
ProductTitle.text = "Warning"
ProductDescription.text = "Product not found"
}
else {
Product = products [0]
ProductTitle.text = Product!.localizedTitle
ProductDescription.text = Product?.localizedDescription
BuyButton.isEnabled = true
}
let Invalids = response.invalidProductIdentifiers
for Product in Invalids {
print("Product not found: \(Product)")
}
}
func paymentQueue(_ queue: SKPaymentQueue, removedTransactions transactions: [SKPaymentTransaction]) {
for transaction in transactions {
switch transaction.transactionState {
case SKPaymentTransactionState.purchased:
SKPaymentQueue.default().finishTransaction(transaction)
ProductTitle.text = "Thank you"
ProductDescription.text = "You have purchased the product"
BuyButton.isEnabled = false
let save = UserDefaults.standard
save.set(true, forKey: "Purchase")
save.synchronize()
case SKPaymentTransactionState.restored:
SKPaymentQueue.default().finishTransaction(transaction)
ProductTitle.text = "Thank you"
ProductDescription.text = "You have purchased the product"
BuyButton.isEnabled = false
let save = UserDefaults.standard
save.set(true, forKey: "Purchase")
save.synchronize()
case SKPaymentTransactionState.failed:
SKPaymentQueue.default().finishTransaction(transaction)
ProductTitle.text = "Warning"
ProductDescription.text = "You have not purchased the product"
default:
break
}
}
}
}
答案 0 :(得分：3)
在您的故事板中右键单击按钮。你应该看到一个名为Label2的出口。删除它，你应该没事。
当您的插座连接到您的代码时，通常会发生这种情况，但是您要么删除/重命名代码中的插座而忘记将其从故事板中删除。
答案 1 :(得分：0)
查看StoreViewController的storyboard / xib。基本上有一个断开的链接，你有一个git branch -a据说连接到ViewController但它不在代码中。 Label2被删除，重命名或被注释掉。
你可以做些什么来修复它是通过右键单击曾经是Label2的元素并从那里删除引用来从Storyboard或Xib中删除那个断开的链接。