细心的你是否也发现了AFN的内存泄漏的问题了呢.

解决方法

+ (AFHTTPSessionManager *)sharedHTTPSession{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    manager = [AFHTTPSessionManager manager];
    manager.requestSerializer.timeoutInterval = 30;
    [manager.requestSerializer  setValue:@"XMLHttpRequest" forHTTPHeaderField:@"X-Requested-With"];
});
return manager;
}

+ (AFURLSessionManager *)sharedURLSession{
static dispatch_once_t onceToken2;
dispatch_once(&onceToken2, ^{
    urlsession = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
});
return urlsession;
}

将有问题的语句全部替换成单例后，再用instruments检查，再也没有出现泄漏的红叉了。O(∩_∩)O哈哈~