Objective c Can'；t在构造函数中实例化id为的对象

我想实例化一个MposClient对象，该对象具有以下接口：

#import <Foundation/Foundation.h>
#import "UICallback.h"
#import "LoginRequest.h"
#import "TransactionRequest.h"
#import "TYMessage.h"


@interface MPosClient : NSThread

/**
 * Default constructor.
 *
 * @param callback a third party application has to implement the UICallback interface and to<BR>
 *                 create it before to create the MPosClient (see UICallback documentation for<BR>
 *                 more information)
 */
- (id)initWithCallback:(id<UICallback>)callback;


- (void)loginWithRequest:(LoginRequest*)request;

@end

@interface PosMateCallback:NSObject<UICallback>
{
    NSString* currencyAphaCode;
    int currencyNumCode;
    double amount;
}

-(id) initCallback: (NSString*) currencyAlphaCode currencyNumCode:(int) currencyCode amount:(double) amountToPay;

@end

@implementation PosMateCallback
-(id) initCallback: (NSString*) currencyAlphaCode currencyNumCode:(int) currencyCode amount:(double) amountToPay{
    self = [super init];
    if (self)
    {
        currencyAphaCode = currencyAlphaCode;
        currencyNumCode = currencyCode;
        amount = amountToPay;
    }
    return self;
}

- (void)loginEndedWithResponse:(LoginResponse*)response{
    //NSLog(@" %@ ",[response getExtendedResultCode]);
    //TransactionType type = TransactionType.DEBIT;


}

- (NSString*)postUIRequest:(UIRequest*)request{
    //interruptedTransaction = request.getMessage().equals("ABANDON");
    return NULL;
}


- (void)transactionEndedWithResponse:(TransactionResponse*)response{

}


@end

#导入
#导入“UICallback.h”
#导入“LoginRequest.h”
#导入“TransactionRequest.h”
#导入“TYMessage.h”
@接口MPosClient:NSThread
/**
*默认构造函数。
*
*@param callback第三方应用程序必须实现UICallback接口并
*在创建MPosClient之前创建它（有关

*（更多信息）
*/
-（id）initWithCallback：（id）callback；
-（void）loginWithRequest:（LoginRequest*）请求；
@结束

不幸的是，它的实现包含在.a文件中。 正如您所看到的，构造函数方法接受一个id对象。 这就是我创建并实现以下接口的原因：

#import <Foundation/Foundation.h>
#import "UICallback.h"
#import "LoginRequest.h"
#import "TransactionRequest.h"
#import "TYMessage.h"


@interface MPosClient : NSThread

/**
 * Default constructor.
 *
 * @param callback a third party application has to implement the UICallback interface and to<BR>
 *                 create it before to create the MPosClient (see UICallback documentation for<BR>
 *                 more information)
 */
- (id)initWithCallback:(id<UICallback>)callback;


- (void)loginWithRequest:(LoginRequest*)request;

@end

@interface PosMateCallback:NSObject<UICallback>
{
    NSString* currencyAphaCode;
    int currencyNumCode;
    double amount;
}

-(id) initCallback: (NSString*) currencyAlphaCode currencyNumCode:(int) currencyCode amount:(double) amountToPay;

@end

@implementation PosMateCallback
-(id) initCallback: (NSString*) currencyAlphaCode currencyNumCode:(int) currencyCode amount:(double) amountToPay{
    self = [super init];
    if (self)
    {
        currencyAphaCode = currencyAlphaCode;
        currencyNumCode = currencyCode;
        amount = amountToPay;
    }
    return self;
}

- (void)loginEndedWithResponse:(LoginResponse*)response{
    //NSLog(@" %@ ",[response getExtendedResultCode]);
    //TransactionType type = TransactionType.DEBIT;


}

- (NSString*)postUIRequest:(UIRequest*)request{
    //interruptedTransaction = request.getMessage().equals("ABANDON");
    return NULL;
}


- (void)transactionEndedWithResponse:(TransactionResponse*)response{

}


@end

@接口PosMateCallback:NSObject
{
NSString*货币密码；
int currencyNumCode；
双倍金额；
}
-（id）initCallback:（NSString*）currencyAlphaCode currencyNumCode:（int）currencyCode金额：（double）金额支付；
@结束
@PosMateCallback的实现
-（id）initCallback:（NSString*）currencyAlphaCode currencyNumCode:（int）currencyCode金额：（double）金额支付{
self=[super init]；
如果（自我）
{
currencyAphaCode=currencyAlphaCode；
currencyNumCode=currencyCode；
金额=支付金额；
}
回归自我；
}
-（void）LoginEndWithResponse:（LoginResponse*）响应{
//NSLog（@“%@，[response getExtendedResultCode]）；
//TransactionType=TransactionType.DEBIT；
}
-（NSString*）假设请求：（UIRequest*）请求{
//interruptedTransaction=request.getMessage（）.equals（“放弃”）；
返回NULL；
}
-（无效）transactionEndedWithResponse:（TransactionResponse*）响应{
}
@结束

因此，在我的viewController中，我尝试实例化一个MPosClient对象，如下所示：

id<UICallback> posmateCallback = [[PosMateCallback alloc] initCallback:@"EUR" currencyNumCode: 978 amount:42];

MPosClient *mposClient = [[MPosClient alloc] initWithCallback: *posmateCallback];

id posmateCallback=[[posmateCallback alloc]initCallback:@“欧元”货币代码：978金额：42]；
MPosClient*MPosClient=[[MPosClient alloc]initWithCallback:*posmateCallback]；

但我得到以下编译错误：

Sending 'id<UICallback>' to parameter of incompatible type 'id<UICallback>'

正在向不兼容类型“id”的参数发送“id”

我完全不明白为什么会发生这种情况，我出了什么问题？

看这行：

MPosClient *mposClient = [[MPosClient alloc] initWithCallback: *posmateCallback];

---

这是什么意思？这没有任何意义。无法取消对id的引用。

将代码更改为：

#import <Foundation/Foundation.h>
#import "UICallback.h"
#import "LoginRequest.h"
#import "TransactionRequest.h"
#import "TYMessage.h"


@interface MPosClient : NSThread

/**
 * Default constructor.
 *
 * @param callback a third party application has to implement the UICallback interface and to<BR>
 *                 create it before to create the MPosClient (see UICallback documentation for<BR>
 *                 more information)
 */
- (id)initWithCallback:(UICallback *)callback;


- (void)loginWithRequest:(LoginRequest*)request;

@end

---

为了让我相信这是实际的代码，请修复拼写错误，并养成以下划线字符开头实例变量名称的习惯。否则，您的代码会让您和其他人感到困惑。对不起，这是我的第一个ios应用程序。这有很多基本问题。首先，在传入UICallBack实例时，为什么要将其强制转换为id？将其更改为UICallBack*PostateCallback=。。。。然后您可以将参数类型更改为hyust UICallBack而不是id？当我删除它时，我有17个构建错误；是图书馆的错吗？我应该如何实例化它。铁律：任何错误都是你的错。2.要删除的是*posmateCallback开头的*。posmateCallback是一个id。您不能取消对id的引用。当我尝试更改MposClient时，会出现编译错误“应为类型”