Xamarin iOS中没有参数的绑定方法

我开始将我的iOS应用程序迁移到统一API，但是我遇到了绑定项目的一些问题。 碰巧有些委托方法不需要参数：

-(void) didFinishSendMail; 

因此，当我尝试生成绑定时，会显示有关所需参数的错误，因此我添加了一个假参数：

 [Export ("didFinishSendMail")] void DidFinishSendMail (bool fakeArg); 

然后绑定项目编译好，只显示一些警告。

但是在主项目中会显示错误：

错误MT4117：注册商在方法’MITiOS_Binding64.MITIntegration / _MITIntegrationDelegate.DidFinishSendMail’中发现签名不匹配 – 选择器’didFinishSendMail’表示方法采用0参数，而托管方法有1个参数。 （MT4117）

在以前版本的Xamarin iOS中，在迁移到Unified API之前，我能够添加–registrar：legacy和编译的主项目没有任何问题，但现在这个注册商与统一API不兼容。

所以问题是，使用统一API绑定不带参数的委托方法的方法是什么？

Api定义添加：

 [Model,Protocol,Preserve, BaseType (typeof (NSObject), Name = "MITIntegrationDelegate")] public partial interface MITIntegrationDelegate { [Export ("didFinishCommandWithError:"), EventArgs("MitError")][Abstract] void DidFinishCommandWithError (MITError error); [Export ("didFinishTransaction:"), EventArgs("MitTransaction")][Abstract] void DidFinishTransaction (MITTransaction transaction); [Export ("didFinishCardReader:"), EventArgs("MitCardInformation")][Abstract] void DidFinishCardReader (MITCardInformation cardInformation); [Export ("didFinishTransactionWithMerchant:"), EventArgs("Merchants")][Abstract] void DidFinishTransactionWithMerchant (NSMutableArray merchants); [Export ("didFinishTransactionWithMerchant:merchantsMCI:merchantsMSI:error:"), EventArgs("MerchantsPDC")][Abstract] void DidFinishTransactionWithMerchantPDC (NSMutableArray merchantsPDC, NSMutableArray merchantsMCI, NSMutableArray merchantsMSI, MITError error); [Export ("didFinishTransactionWithLocalDccOption:andForeignDccOption:"), EventArgs("LocalDccOption")][Abstract] void DidFinishTransactionWithLocalDccOption(MITDccOption localOption, MITDccOption foreignOption); [Export ("onReturnEmvApplications:"), EventArgs("EmvApplications")][Abstract] void OnReturnEmvApplications (NSMutableArray applicationArray); [Export ("didFinishSendMailWithError:"), EventArgs("MitError")] void DidFinishSendMailWithError (MITError error); [Export ("didFinishSendElectronicBillWithMessage:error:"), EventArgs("SendElectronicBill")][Abstract] void DidFinishSendElectronicBillWithMessage (string message, MITError error); [Export ("didFinishSendMail"), EventArgs("Fake")] void DidFinishSendMail (bool fakeArg); [Export ("didFinishUploadSignature:"), EventArgs("Fake")] void DidFinishUploadSignature (bool fakeArg); [Export ("didFinishUploadSignatureWithError:"), EventArgs("MitError")] void DidFinishUploadSignatureWithError (MITError error); [Export ("onNoDeviceDetected:"), EventArgs("Fake")] void OnNoDeviceDetected (bool fakeArg); [Export ("onWaitingForCard:"), EventArgs("Fake")] void OnWaitingForCard (bool fakeArg); [Export ("onDeviceUnplugged:"), EventArgs("Fake")] void OnDeviceUnplugged (bool fakeArg); [Export ("onRequestTextInfo:"), EventArgs("RequestTextInfo")] void OnRequestTextInfo (string textInfo); [Export ("onReturnWalkerUid:newUid:"), EventArgs("ReturnWalkerUid")] void OnReturnWalkerUid (string uid, string newUid); [Export ("onReturnWalkerBatteryLevel:"), EventArgs("ReturnBatteryLevel")] void OnReturnWalkerBatteryLevel (string batteryLevel); [Export ("onReturnTransactions:error:"), EventArgs("ReturnTransactions")] void OnReturnTransactions (NSArray transactions, MITError error); } [BaseType (typeof (NSObject),Name = "MITIntegration", Delegates=new string [] { "WeakDelegate" }, Events=new Type [] { typeof (MITIntegrationDelegate)})] public partial interface MITIntegration { [Export ("delegate", ArgumentSemantic.Assign)] NSObject WeakDelegate { get; set; } [Wrap ("WeakDelegate"), NullAllowed] MITIntegrationDelegate Delegate { get; set; } [Export ("cardInformation", ArgumentSemantic.Retain)] MITCardInformation CardInformation { get; set; } [Export ("url")] string Url { set; } [Export ("deviceConnect")] bool DeviceConnect { get; } [Export ("deviceDissconnect")] void DeviceDissconnect (); [Export ("getConnectionID")] string GetConnectionID { get; } [Export ("getName")] string GetName { get; } [Export ("getManufacturer")] string GetManufacturer { get; } [Export ("getModelNumber")] string GetModelNumber { get; } [Export ("getSerialNumber")] string GetSerialNumber { get; } [Export ("getFirmwareRevision")] string GetFirmwareRevision { get; } [Export ("getHardwareRevision")] string GetHardwareRevision { get; } [Export ("getTransactionsWithUser:password:")] void getTransactionsWithUser (string user, string password); [Export ("sndEmvDirectSellWithAmount:company:branch:user:password:usrTrx:merchant:reference:operationType:country:currency:amexCvv:")] void SndEmvDirectSellWithAmount (string amount, string company, string branch, string user, string password, string usrTrx, string merchant, string reference, string operationType, string country, string currency, string amexCvv); [Export ("sndMsrDirectSellWithAmount:company:branch:user:password:usrTrx:merchant:reference:operationType:country:currency:amexCvv:")] void SndMsrDirectSellWithAmount (string amount, string company, string branch, string user, string password, string usrTrx, string merchant, string reference, string operationType, string country, string currency, string amexCvv); [Export ("sndReprintVoucherWithUser:password:company:branch:folio:")] void SndReprintVoucherWithUser (string user, string password, string company, string branch, string folio); [Export ("sndCancelTransacctionWithUser:password:company:branch:folio:auth:amount:")] void SndCancelTransacctionWithUser (string user, string password, string company, string branch, string folio, string auth, string amount); [Export ("sndPay:")] void SndPay (string merchant); [Export ("sndEmailWithAddress:copyAddress:folio:User:password:company:branch:")] void SndEmailWithAddress (string address, string copyAddress, string folio, string user, string password, string company, string branch); [ExportAttribute("sndTaeServiceEmailWithAddress:copyAddress:folio:user:password:company:branch:idTaeCategory:idTaeProvider:idTaeProduct:")] void SndTaeServiceEmailWithAddress (string address, string copyAddress, string folio, string user, string password, string company, string branch, string idTaeCategory, string idTaeProvider, string idTaeProduct); [Export ("sndSmsWithCellPhoneNumber:carrier:folio:company:branch:User:password:")] void sndSmsWithCellPhoneNumber (string cellPhoneNumber, string carrier, string folio, string company, string branch, string user, string password); [Export ("uploadSignatureWithImage:folio:")] void UploadSignatureWithImage (UIView view, string folio); [Export ("device")] nint Device { set; } [Export ("monthsToPay")] string MonthsToPay { set; } [Export ("sndElectronicBillWithUser:company:branch:amount:ticket:folio:concept:ccNumber:billType:emailAddress:")] void SndElectronicBillWithUser(string user, string company,string branch,string amount,string ticket,string folio,string concept,string ccNumber,string billType,string emailAddress); [Export ("cancelWalkerReader")] void CancelWalkerReader (); [Export ("cancelWalkerTransaction")] void CancelWalkerTransaction (); [Export ("getWalkerUid")] void GetWalkerUid (); [Export ("getWalkerBatteryLevel")] void GetWalkerBatteryLevel (); } 

Answer 1

不要添加假参数，这是您尝试解决的问题的错误解决方案。

不幸的是，我们不支持带有不带任何参数的Objective-C委托的C＃-event-pattern [1]。

解决方案是使用Objective-C委托模式。

在API定义中定义类如下：

 [BaseType (typeof (NSObject),Name = "MITIntegration"] public partial interface MITIntegration { [Export ("delegate", ArgumentSemantic.Assign), NullAllowed] MITIntegrationDelegate Delegate { get; set; } // ... } 

然后像这样使用它：

 class MyClass { MITIntegration integration; MyIntegrationDelegate integration_delegate; void Initialize () { integration = new MITIntegration (); integration.Delegate = integration_delegate; } } class MyIntegrationDelegate : MITIntegrationDelegate { public override void DidFinishSendMail () { // handle this somehow } } 

[1] Objective-C指南说第一个参数应该是发送消息的对象。