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未设置的委托正在崩溃

swift ios

-1

da1lbi3 · 技术社区 · 7 年前

很难控制代码崩溃,我自己无法复制,但我有几个崩溃报告。它在这条线上崩溃了:

我认为当视图再次打开时,它必须这样做,代表已经是零了,而我认为这不好吗?

import Foundation
import UIKit
import FirebaseDatabase
import StoreKit

class Premium : UITableViewController, SKPaymentTransactionObserver, SKProductsRequestDelegate {

    override func viewDidLoad() {

        NotificationCenter.default.addObserver(self, selector: #selector(onHasPayed(notification:)), name: .hasPayed, object: nil)


        if SKPaymentQueue.canMakePayments() {
            print("starting IAPS")
            let productIdentifiers = Set([ audioWifi, audioVideo4G, deluxe])

            self.request = SKProductsRequest(productIdentifiers: productIdentifiers as Set<String>)
            self.request.delegate = self
            self.request.start()


        } else {
            print("please enable IAPS")
        }
    }

    @objc func onHasPayed(notification: NSNotification) {
        redirect()
    }

    private func redirect(){
        let appDelegate = UIApplication.shared.delegate! as! AppDelegate

        let initialViewController = self.storyboard!.instantiateViewController(withIdentifier: "hh")
        appDelegate.window?.rootViewController = initialViewController
        appDelegate.window?.makeKeyAndVisible()
    }


    private var request: SKProductsRequest!


    override func viewWillDisappear(_ animated: Bool) {
        request.delegate = nil;
        request.cancel()
        request = nil;

    }
}

在哪里需要设置请求委托,在哪里需要取消设置它?因为,我不知道出了什么问题,因为我自己无法模拟。

可能的解决方案:

    private var request: SKProductsRequest?

    if SKPaymentQueue.canMakePayments() {
                print("starting IAPS")
                let productIdentifiers = Set([ audioWifi, audioVideo4G, deluxe])

                self.request = SKProductsRequest(productIdentifiers: productIdentifiers as Set<String>)
                self.request?.delegate = self
                self.request?.start()
            } else {
                print("please enable IAPS")
            }

override func viewWillDisappear(_ animated: Bool) {
        if let req = request {
            req.delegate = nil;
            req.cancel()
        }
    }