在使用不同实例（RestKit）的方法调用期间冲突 SharedInstance

Question

我正在为 RESTFUL Web 服务使用 Restkit 框架。

我的资源管理器，即 TaskManager 和 TaskDashboardCountManager 发生冲突。 当我调用方法时

 [[TaskDashboardCountManager sharedManager] loadTaskCount:^(NSDictionary *task) {}];

我遇到了异常

'NSInvalidArgumentException'，原因：'-[TaskDashboardCountManager loadTask:failure:]：

loadTask 是 TaskManager 的方法，但它是使用 TaskDashboardCountManger 调用的。我该如何解决这个问题？

 **RKObjectManager.h**
          @interface AKObjectManager : RKObjectManager

            + (instancetype) sharedManager;

            - (void) setupRequestDescriptors;
            - (void) setupResponseDescriptors;

            @end

    **RKObjectManager.m**
    static AKObjectManager *sharedManager = nil;

    @implementation AKObjectManager

    + (instancetype)sharedManager {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            NSURL *url = [NSURL URLWithString:BASE_DEVELOPMENT_URL];

            sharedManager = [self managerWithBaseURL:url];

            sharedManager.requestSerializationMIMEType = RKMIMETypeJSON;
            /*
             THIS CLASS IS MAIN POINT FOR CUSTOMIZATION:
             - setup HTTP headers that should exist on all HTTP Requests
             - override methods in this class to change default behavior for all HTTP Requests
             - define methods that should be available across all object managers
             */

            [sharedManager setupRequestDescriptors];
            [sharedManager setupResponseDescriptors];

            AppDelegate *delegate=(AppDelegate *)[[UIApplication sharedApplication] delegate];
            [sharedManager.HTTPClient setDefaultHeader:@"Authorization" value: [NSString stringWithFormat:@"token %@", delegate.key]];


        });

        return sharedManager;
    }

    - (void) setupRequestDescriptors {
    }

    - (void) setupResponseDescriptors {
    }


    **TaskManager.m**
    @implementation TaskManager

    + (id)sharedInstance {
        static TaskManager *__sharedInstance=nil;
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            __sharedInstance = [[self alloc] init];

            [__sharedInstance setupResponseDescriptors];
        });

        return __sharedInstance;
    }



    - (void) loadTask:(void (^)(NSArray *task))success failure:(void (^)(RKObjectRequestOperation *operation, NSError *error))failure{

        });


    **#import "TaskDashboardCountManager.h"**

        static TaskDashboardCountManager *sharedManager = nil;

        @implementation TaskDashboardCountManager

        + (id)sharedInstance {
            static TaskDashboardCountManager *__sharedInstance=nil;
            static dispatch_once_t onceToken;
            dispatch_once(&onceToken, ^{
                __sharedInstance = [[self alloc] init];

                [__sharedInstance setupResponseDescriptors];
            });

            return __sharedInstance;
        }

        - (void) loadTaskCount:(void (^)(NSDictionary *task))success failure:(void (^)(RKObjectRequestOperation *operation, NSError *error))failure{
        });

Answer 1

您似乎混淆了sharedInstance 和sharedManager。将有 1 个 sharedManager 将是第一个创建的，然后，任何其他对 sharedManager 的引用，无论它来自哪个类，都将返回相同的实例。

至少你需要清理它。目前还不清楚为什么AKObjectManager 有一个sharedManager 方法，如果它是子类，那么超类不能实例化是合乎逻辑的......

你最好不要尝试如此普遍地使用单例，而是显式地创建实例并使用依赖注入。