AFHTTPSessionManager无法解除分配

Question

更新

将此问题作为问题发布到AFNetworking回购后，事实证明这实际上是我的使用问题。根据我的问题回复：

  

NSURLSession保留其委托（即AFURLSessionManager）。调用invalidateSessionCancelingTasks：确保会话最终确定并释放其委托。

所以，长话短说：如果您按照下述方式使用AHTTPSessionManager，请务必致电invalidateSessionCancelingTasks:以确保会话最终确定并释放其代表

原始问题

我有一个名为AFHTTPSessionManager的子类GTAPIClient，我用它连接到我的REST API。我意识到文档声明要用作单例，但在某些情况下我需要编写一个新实例。但是，似乎每当我这样做时，对象永远不会被释放。目前，GTAPIClient除了NSLog本身在取消分配时几乎不执行任何操作。 这是一些演示行为的示例代码

GTAPIClient.m

@implementation GTAPIClient
- (void)dealloc
{
    NSLog(@"Dealloc: %@", self);    
}

@end

GTViewController.m

#import "GTBaseEntityViewController.h"

//Models
#import "GTBaseEntity.h"

//Clients
#import "GTAPIClient.h"

@interface GTBaseEntityViewController ()

@property (nonatomic, weak) GTAPIClient *client;
@property (nonatomic, weak) GTBaseEntity *weakEntity;

@end

@implementation GTBaseEntityViewController

- (IBAction)makeClient:(id)sender {

    self.client = [[GTAPIClient alloc] init];
    NSLog(@"I just made an API client %@", self.client);

    //Another random object assigned to a similar property, just to see what happens.
    self.weakEntity = [[GTBaseEntity alloc] init];
    NSLog(@"I just made a random object %@", self.weakEntity);

}

- (IBAction)checkClient:(id)sender {

    NSLog(@"Client: %@", self.client);
    NSLog(@"Entity: %@", self.weakEntity);

}

@end

NSLog输出

开火makeClient:

//It seems to me that both NSLog's should return (null) as they are assigning to a weak property
2014-06-22 16:41:39.143 I just made an API client <GTAPIClient: 0x10b913680, baseURL: (null), session: <__NSCFURLSession: 0x10b915010>, operationQueue: <NSOperationQueue: 0x10b9148a0>{name = 'NSOperationQueue 0x10b9148a0'}>
2014-06-22 16:41:39.144 I just made a random object (null)

开火checkClient

//Again, both NSLog's should return null for the two objects. However...client is still around. Also, it's overridden dealloc method never fired.

2014-06-22 16:44:43.722  Client: <GTAPIClient: 0x10b913680, baseURL: (null), session: <__NSCFURLSession: 0x10b915010>, operationQueue: <NSOperationQueue: 0x10b9148a0>{name = 'NSOperationQueue 0x10b9148a0'}>
2014-06-22 16:44:43.723 Entity: (null)

供参考，我使用的是AFNetworking的v2.3.1。编译器警告我，将保留对象分配给weak属性将在赋值后释放 - 这是正确的，并且随我的随机对象一起运行。应用程序中没有其他任何内容。没有其他视图控制器，GTAPIClient上没有其他方法，所有单例功能都被删除。我在这里做错了什么想法？

Answer 1

复制场景并通过Instruments运行它表明AFURLSessionManagers由他们创建的NSURLSession保留，因为AFURLSessionManager充当每个创建的NSURLSession的委托。这会创建一个保留周期，因此无法释放AFHTTPSessionManager。无论这是一个库中的错误还是根本没有错误，我都不确定。您可能希望在AFNetworking GitHub页面（https://github.com/AFNetworking/AFNetworking）上报告它。

Answer 2

__weak typeof(manager) weak_manager = manager;
[manager requestWithMethod:method URLString: uri parameters:param
         success:^(NSURLSessionDataTask *task, id responseObject) {
                if (completion) {
                    completion(YES, responseObject, task.response);
                }
                [weak_manager invalidateSessionCancelingTasks:YES];
         }
         failure:^(NSURLSessionDataTask *task, NSError *error) {
                if (completion) {
                    completion(NO, error, task.response);
                }
                [weak_manager invalidateSessionCancelingTasks:YES];
         }];