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我有一个用Swift编写的iOS应用程序，我在其自己的类（Store）中为商店编写代码。然后我有一个视图控制器（StoreController），它显示产品详细信息并呈现按钮，以便用户可以购买/恢复购买。我正在使用委托模式。我应该在哪里应用程序运行时声明/实例化Store对象以保持它可用？
我的问题是我应该在哪里创建Store对象？目前我将它声明为StoreController的一个属性，我认为这是错误的。我希望能够在我的应用程序加载时创建它，并保留它直到它退出。
目前的问题是，如果我测试它并导航到StoreController视图（通过Store启动请求），然后按'返回'应用程序冻结。我假设，因为它正在等待回应？
我在网上看到一个例子，有人在AppDelegate文件中创建它，但这对我没有用，因为我无法从我的StoreController中引用它。
这是我的店铺等级：
import Foundation
import StoreKit
protocol ClassStoreDelegate: class {
func storeUpdateReceived(store: Store)
}
class Store: NSObject, SKProductsRequestDelegate, SKPaymentTransactionObserver {
// Properties
weak var delegate: ClassStoreDelegate?
var list = [SKProduct]()
var p = SKProduct()
var defaults = UserDefaults.standard // Where we save whether the user is pro
var localTitle: String?
var localDescription: String?
var localPrice: String?
// Methods
// Calling the delegate method
func storeUpdate() {
delegate?.storeUpdateReceived(store: self)
}
// Buy the product
func buy() {
for product in list {
let prodID = product.productIdentifier
if(prodID == "com.squidgylabs.pro") {
p = product
buyProduct()
}
}
}
// Restore products
func restore() {
SKPaymentQueue.default().add(self)
SKPaymentQueue.default().restoreCompletedTransactions()
}
func getProducts() {
if(SKPaymentQueue.canMakePayments()) {
let productID: NSSet = NSSet(objects: "com.squidgylabs.pro")
let request: SKProductsRequest = SKProductsRequest(productIdentifiers: productID as! Set<String>)
request.delegate = self
request.start()
} else {
delegate?.storeUpdateReceived(store: self)
}
}
func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
let myProduct = response.products
for product in myProduct {
list.append(product)
}
// Update labels
localTitle = list[0].localizedTitle
localDescription = list[0].localizedDescription
// Format the price and display
let formatter = NumberFormatter()
formatter.locale = Locale.current
formatter.numberStyle = .currency
if let formattedPrice = formatter.string(from: list[0].price){
localPrice = ("buy \(formattedPrice)")
delegate?.storeUpdateReceived(store: self)
}
}
func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue) {
let transactionsArray = queue.transactions
if (transactionsArray.isEmpty) {
delegate?.storeUpdateReceived(store: self)
}
else {
for transaction in transactionsArray {
let t: SKPaymentTransaction = transaction
let prodID = t.payment.productIdentifier as String
switch prodID {
case "com.squidgylabs.pro":
defaults.set(true, forKey: "pro")
delegate?.storeUpdateReceived(store: self)
default:
delegate?.storeUpdateReceived(store: self)
}
}
}
}
func buyProduct() {
let pay = SKPayment(product: p)
SKPaymentQueue.default().add(self)
SKPaymentQueue.default().add(pay as SKPayment)
}
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
for transaction: AnyObject in transactions {
let trans = transaction as! SKPaymentTransaction
switch trans.transactionState {
case .purchased:
let prodID = p.productIdentifier
switch prodID {
case "com.squidgylabs.pro":
defaults.set(true, forKey: "pro")
delegate?.storeUpdateReceived(store: self)
default:
delegate?.storeUpdateReceived(store: self)
}
queue.finishTransaction(trans)
break
case .failed:
delegate?.storeUpdateReceived(store: self)
queue.finishTransaction(trans)
break
case .restored:
SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
queue.finishTransaction(trans)
break
default:
break
}
}
}
}
这是我StoreController（视图控制器）：
import UIKit
class StoreController: UIViewController, ClassStoreDelegate {
// Properties
let store = Store()
// Outlets
@IBOutlet weak var localTitle: UILabel!
@IBOutlet weak var localDescription: UILabel!
@IBOutlet weak var buy: UIButton!
@IBOutlet weak var restore: UIButton!
// Actions
@IBAction func buy(_ sender: UIButton) {
print("buy pressed")
store.buy()
}
@IBAction func restore(_ sender: UIButton) {
print("restore pressed")
store.restore()
}
// Methods
override func viewDidLoad() {
super.viewDidLoad()
store.delegate = self // bind the delegate like this?
// Get list of products for the store
localTitle.isEnabled = false
localDescription.isEnabled = false
buy.isEnabled = false
restore.isEnabled = false
self.navigationItem.title = "Store"
// update once the list of products is got from the store object
store.getProducts()
}
// Running the delegate update
func storeUpdateReceived(store: Store) {
print("storeUpdateReceived activated")
if ((store.localTitle) != nil) {
localTitle.text = store.localTitle!
localDescription.text = store.localDescription
buy.setTitle(store.localPrice, for: .normal)
localTitle.isEnabled = true
localDescription.isEnabled = true
buy.isEnabled = true
restore.isEnabled = true
}
}
}