在 Xamarin 中跟踪"unrecognized selector sent to instance"异常

Question

我试图让它工作，但我一定在某处犯了一个错误。这是根据 C 标头的委托类（截取）：

@protocol PaymentEngineMiddlewareDelegate <NSObject>
@required
/*!
    @brief Delegate method for startTransaction. 
    @param transResponse - Contains all the transaction response info from the gateway
 */
-(void)transactionComplete :(PaymentEngineTransactionResponse *)transResponse;
@optional
/*!
    @brief Delegate method for device connected. The method gets called when the device is connected
 */
-(void)deviceConnected;
/*!
  @brief Delegate method for device disconnected. The method gets called when the device is disconnected
 */
-(void)deviceDisconnected;
@end

为此，我有：

// @interface PaymentEngineMiddlewareDelegate : NSObject
[BaseType(typeof(NSObject))]
[Model]
[Protocol]
interface PaymentEngineMiddlewareDelegate
{
    [Abstract]
    [Export("transactionComplete:")]
    void TransactionComplete(PaymentEngineTransactionResponse transResponse);
    [Export("deviceConnected")]
    void DeviceConnected();
    [Export("deviceDisconnected")]
    void DeviceDisconnected();
}

然后对于 PaymentEngineMiddleware 类，标头如下：

@interface PaymentEngineMiddleware : NSObject
+ (PaymentEngineMiddleware *) getInstance;
@property(nonatomic, strong) id<PaymentEngineMiddlewareDelegate> delegate;
//------------------------------Device Methods------------------------------
/*!
    @brief This method must be called before starting any transaction. Use it to connect to a device.
    @param deviceName The name of the device such as icmp or castle
    @param setDelegate Sets to self
 */
-(void)setDevice :(NSString *)deviceName :(id)setDelegate;
@end

为此，我有：

// @interface PaymentEngineMiddleware : NSObject
[BaseType(typeof(NSObject))]
[Protocol]
interface PaymentEngineMiddleware
{
    // +(id)getInstance;
    [Static]
    [Export("getInstance")]
    PaymentEngineMiddleware GetInstance { get; }
    [Export("delegate", ArgumentSemantic.Retain)]
    PaymentEngineMiddlewareDelegate Delegate { get; set; }
    [Export("setDevice:setDelegate:")]
    void SetDevice(string deviceName, PaymentEngineMiddlewareDelegate setDelegate);
}

在代码中，当我尝试调用"中间件"时。SetDevice（'name'， this）;" 这是一个从委托继承的类，我得到异常。

有什么明显的我错过或出错的地方吗？

Answer 1

setDevice方法的选择器是错误的。

-(void)setDevice :(NSString *)deviceName :(id)setDelegate方法的正确选择器是 setDevice:: 。这是因为此方法中的第二个参数没有外部名称。

绑定的最终条目应如下所示

[Export("setDevice::")]
void SetDevice(string deviceName, PaymentEngineMiddlewareDelegate setDelegate);

您可以在Apple文档中阅读有关Objective-C中方法签名如何构造的更多信息。

Answer 2

还要在情节提要文件中查找代码中未实现的属性中的组件操作。

就我而言，我已经为故事板文件中的按钮提供了 Touch insideUp 操作，但没有在代码中实现。 实施后，此问题已不复存在。