通过应用内购买购买商品时，我的应用有时会崩溃。
大多数情况下它工作正常，但有时应用程序崩溃而没有任何错误（我正在调试模式下测试）。
为了设置应用内购买（非消耗品），我使用了以下示例： https ://github.com/conceptdev/xamarin-samples/tree/master/InAppPurchase/NonConsumables
处理应用内购买的类如下所示：
public class InAppPurchaseManager : SKProductsRequestDelegate {
public static NSString InAppPurchaseManagerProductsFetchedNotification = new NSString("InAppPurchaseManagerProductsFetchedNotification");
public static NSString InAppPurchaseManagerTransactionFailedNotification = new NSString("InAppPurchaseManagerTransactionFailedNotification");
public static NSString InAppPurchaseManagerTransactionSucceededNotification = new NSString("InAppPurchaseManagerTransactionSucceededNotification");
public static NSString InAppPurchaseManagerRequestFailedNotification = new NSString("InAppPurchaseManagerRequestFailedNotification");
SKProductsRequest productsRequest;
CustomPaymentObserver theObserver;
SKProduct[] products;
public static NSAction Done {get;set;}
public InAppPurchaseManager ()
{
theObserver = new CustomPaymentObserver(this);
SKPaymentQueue.DefaultQueue.AddTransactionObserver(theObserver);
}
// received response to RequestProductData - with price,title,description info
public override void ReceivedResponse (SKProductsRequest request, SKProductsResponse response)
{
products = response.Products;
NSDictionary userInfo = null;
if (products.Length > 0) {
NSObject[] productIdsArray = new NSObject[response.Products.Length];
NSObject[] productsArray = new NSObject[response.Products.Length];
for (int i = 0; i < response.Products.Length; i++) {
productIdsArray[i] = new NSString(response.Products[i].ProductIdentifier);
productsArray[i] = response.Products[i];
}
userInfo = NSDictionary.FromObjectsAndKeys (productsArray, productIdsArray);
}
NSNotificationCenter.DefaultCenter.PostNotificationName(InAppPurchaseManagerProductsFetchedNotification,this,userInfo);
foreach (string invalidProductId in response.InvalidProducts) {
Console.WriteLine("Invalid product id: " + invalidProductId );
}
}
// request multiple products at once
public void RequestProductData (List<string> productIds)
{
var array = new NSString[productIds.Count];
for (var i = 0; i < productIds.Count; i++) {
array[i] = new NSString(productIds[i]);
}
NSSet productIdentifiers = NSSet.MakeNSObjectSet<NSString>(array);
//set up product request for in-app purchase
productsRequest = new SKProductsRequest(productIdentifiers);
productsRequest.Delegate = this; // SKProductsRequestDelegate.ReceivedResponse
productsRequest.Start();
Console.WriteLine ("BEREIKT");
}
// Verify that the iTunes account can make this purchase for this application
public bool CanMakePayments()
{
return SKPaymentQueue.CanMakePayments;
}
public void PurchaseProduct(string appStoreProductId)
{
Console.WriteLine("PurchaseProduct " + appStoreProductId);
SKPayment payment = SKPayment.PaymentWithProduct (appStoreProductId);
SKPaymentQueue.DefaultQueue.AddPayment (payment);
}
public void CompleteTransaction (SKPaymentTransaction transaction)
{
Console.WriteLine ("CompleteTransaction " + transaction.TransactionIdentifier);
var productId = transaction.Payment.ProductIdentifier;
// Register the purchase, so it is remembered for next time
//PhotoFilterManager.Purchase(productId);
UserDefaults.Purchase(productId);
FinishTransaction (transaction, true);
//Show Dialog
new UIAlertView("Succes", "De aankoop is gelukt." +
"\n Je kunt de gekozen categorieën nu spelen.", null, "OK", null).Show();
/*
if (ReceiptValidation.VerificationController.SharedInstance.VerifyPurchase (transaction)) {
Console.WriteLine ("Verified!");
// Register the purchase, so it is remembered for next time
PhotoFilterManager.Purchase(productId);
FinishTransaction (transaction, true);
} else {
Console.WriteLine ("NOT Verified :(");
FinishTransaction (transaction, false);
}
*/
}
public void RestoreTransaction (SKPaymentTransaction transaction)
{
// Restored Transactions always have an 'original transaction' attached
Console.WriteLine("RestoreTransaction " + transaction.TransactionIdentifier + "; OriginalTransaction " + transaction.OriginalTransaction.TransactionIdentifier);
var productId = transaction.OriginalTransaction.Payment.ProductIdentifier;
// Register the purchase, so it is remembered for next time
//PhotoFilterManager.Purchase(productId); // it's as though it was purchased again
UserDefaults.Purchase(productId);
FinishTransaction(transaction, true);
}
public void FailedTransaction (SKPaymentTransaction transaction)
{
//SKErrorPaymentCancelled == 2
if (transaction.Error.Code == 2) // user cancelled
Console.WriteLine("User CANCELLED FailedTransaction Code=" + transaction.Error.Code + " " + transaction.Error.LocalizedDescription);
else // error!
Console.WriteLine("FailedTransaction Code=" + transaction.Error.Code + " " + transaction.Error.LocalizedDescription);
FinishTransaction(transaction,false);
//Show Dialog
new UIAlertView("Helaas", "De aankoop is mislukt." +
"\n Probeer het op een later tijdstip nogmaals a.u.b.", null, "OK", null).Show();
}
public void FinishTransaction(SKPaymentTransaction transaction, bool wasSuccessful)
{
Console.WriteLine("FinishTransaction " + wasSuccessful);
// remove the transaction from the payment queue.
SKPaymentQueue.DefaultQueue.FinishTransaction(transaction); // THIS IS IMPORTANT - LET'S APPLE KNOW WE'RE DONE !!!!
using (var pool = new NSAutoreleasePool()) {
NSDictionary userInfo = NSDictionary.FromObjectsAndKeys(new NSObject[] {transaction},new NSObject[] {new NSString("transaction")});
if (wasSuccessful) {
// send out a notification that we’ve finished the transaction
NSNotificationCenter.DefaultCenter.PostNotificationName(InAppPurchaseManagerTransactionSucceededNotification,this,userInfo);
} else {
// send out a notification for the failed transaction
NSNotificationCenter.DefaultCenter.PostNotificationName(InAppPurchaseManagerTransactionFailedNotification,this,userInfo);
}
}
}
/// <summary>
/// Probably could not connect to the App Store (network unavailable?)
/// </summary>
public override void RequestFailed (SKRequest request, NSError error)
{
Console.WriteLine (" ** InAppPurchaseManager RequestFailed() " + error.LocalizedDescription);
using (var pool = new NSAutoreleasePool()) {
NSDictionary userInfo = NSDictionary.FromObjectsAndKeys(new NSObject[] {error},new NSObject[] {new NSString("error")});
// send out a notification for the failed transaction
NSNotificationCenter.DefaultCenter.PostNotificationName(InAppPurchaseManagerRequestFailedNotification,this,userInfo);
}
}
/// <summary>
/// Restore any transactions that occurred for this Apple ID, either on
/// this device or any other logged in with that account.
/// </summary>
public void Restore()
{
Console.WriteLine (" ** InAppPurchaseManager Restore()");
// theObserver will be notified of when the restored transactions start arriving <- AppStore
SKPaymentQueue.DefaultQueue.RestoreCompletedTransactions();
}
}
什么可能导致崩溃？
仅供参考：我正在使用 Xamarin iOS 版本 6.3.4.36（测试版）。现在我使用这个 beta 版本，因为它解决了我在 Game Center 上遇到的问题。Xamarin 的稳定版本还没有解决这个问题。
PS。我读到我使用的示例没有实现 RECEIPT VERIFICATION。这是什么意思，是否有必要实施？
第一次更新：
有时我会收到此错误。
mono-rt: Stacktrace:
mono-rt: at <unknown> <0xffffffff>
mono-rt: at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>
mono-rt: at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
mono-rt: at PP_IOS.Application.Main (string[]) [0x00001] in /Users/Mac01/Projects/PP/PP_IOS/Main.cs:19
mono-rt: at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
mono-rt:
Native stacktrace:
mono-rt:
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
还有一次我得到这个错误：
mono-rt: Stacktrace:
mono-rt: at <unknown> <0xffffffff>
mono-rt: at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging.void_objc_msgSend_IntPtr (intptr,intptr,intptr) <IL 0x00025, 0xffffffff>
mono-rt: at MonoTouch.StoreKit.SKPaymentQueue.AddPayment (MonoTouch.StoreKit.SKPayment) [0x0001c] in /Developer/MonoTouch/Source/monotouch/src/StoreKit/SKPaymentQueue.g.cs:107
mono-rt: at PP_IOS.InAppPurchaseManager.PurchaseProduct (string) [0x0001f] in /Users/Mac01/Projects/PP/PP_IOS/Utils/InAppPurchase/InAppPurchaseManager.cs:109
mono-rt: at PP_IOS.UpgradeScreen.<BuyCategoryArtistsAndSports>m__21 () [0x0003d] in /Users/Mac01/Projects/PP/PP_IOS/ControllersUniversal/UpgradeScreen.cs:171
mono-rt: at MonoTouch.Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Developer/MonoTouch/Source/monotouch/src/shared/Foundation/NSAction.cs:87
mono-rt: at (wrapper runtime-invoke) object.runtime_invoke_void__this__ (object,intptr,intptr,intptr) <IL 0x0004e, 0xffffffff>
mono-rt: at <unknown> <0xffffffff>
mono-rt: at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>
mono-rt: at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
mono-rt: at PP_IOS.Application.Main (string[]) [0x00001] in /Users/Mac01/Projects/PP/PP_IOS/Main.cs:19
mono-rt: at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
mono-rt:
Native stacktrace:
mono-rt:
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
第二次更新
我刚刚找到了问题发生的方式。购买和恢复应用内购买的按钮显示在模式视图中。当我重新打开模式视图并点击购买或恢复按钮时，应用程序似乎崩溃了。因此，当我第一次打开模态视图并点击购买和恢复按钮时，它（大部分时间）工作正常。但是当我重新打开模态视图并点击购买或恢复按钮时，应用程序崩溃并出现上面显示的错误。
有人熟悉这个吗？