Question

我正在 Implicit conversion of an Objective-C pointer to '__autoreleasing id<MY_AccountDAO>' is disallowed with ARC 。

我回顾了这个问题：Passing object pointer as protocol pointer但这是一个不同的问题，我已经在答案中使用了建议的语法。

我收到了错误：

[accountService setAccountDAO:accountDAO];

具体来说，accountDAO引用下面有一个小的橙色三角形。

@implementation MY_Bootstrapper

#import "MY_Bootstrapper.h"
#import "MY_MainController.h"
#import "MY_ServiceManager.h"

#import "MY_FileSystemAccountDAO.h"
#import "MY_AccountDAO.h"

#import "MY_AccountService.h"
#import "MY_BasicAccountService.h"

@implementation MY_Bootstrapper 

-(MY_MainController *)initializeMainController{
    MY_MainController *mainController = [MY_MainController alloc];
    mainController = [mainController init];

    MY_ServiceManager *serviceManager = [MY_ServiceManager alloc];
    serviceManager = [serviceManager init];

    MY_BasicAccountService *accountService = [MY_BasicAccountService alloc];
    accountService = [accountService init];

    id<MY_AccountDAO> accountDAO = [[MY_FileSystemAccountDAO alloc] init];

    [accountService setAccountDAO:accountDAO];

    serviceManager.accountService = accountService;

    return mainController;
}

@end

@interface MY_FileSystemAccountDAO

@interface MY_FileSystemAccountDAO : MY_FileSystemDAO <MY_AccountDAO>

@end

@interface MY_BasicAccountService

#import <Foundation/Foundation.h>
#import "MY_BasicService.h"
#import "MY_AccountService.h"

@interface MY_BasicAccountService : MY_BasicService <MY_AccountService>

- (void) setAccountDAO:(id<MY_AccountDAO> *)accountDAO;

@end

Answer 1

- (void) setAccountDAO:(id<MY_AccountDAO> *)accountDAO;

该行声明accountDAO是指针的指针，因为id隐式是指针。正确的声明只是

- (void) setAccountDAO:(id<MY_AccountDAO>) accountDAO;

ARC，协议，指针和错误

1 个答案: