Adds support for ReactiveCocoa (RAC) to AFNetworkReachabilityManager.

AFNetworkReachabilityManager+RAC.h

// Copyright (c) 2014 Alex Manarpies
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#import <AFNetworking/AFNetworkReachabilityManager.h>

@class RACSignal;

@interface AFNetworkReachabilityManager (RAC)

- (RACSignal *)rac_reachabilityStatusChangeSignal;

@end

AFNetworkReachabilityManager+RAC.m

// Copyright (c) 2014 Alex Manarpies
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#import <ReactiveCocoa.h>
#import <objc/runtime.h>
#import "AFNetworkReachabilityManager+RAC.h"

@implementation AFNetworkReachabilityManager (RAC)

- (RACSignal *)rac_reachabilityStatusChangeSignal
{
    RACSignal *signal = objc_getAssociatedObject(self, _cmd);

    if (!signal) {
        @weakify(self)

        // Creates multicast signal (messages will arrive on all subscribers) which listens for status changes.
        signal = [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            @strongify(self)
            [self setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
                [subscriber sendNext:@(status)];
            }];
            return nil;
        }] publish] autoconnect];

        // Auto-start monitoring
        [self startMonitoring];

        objc_setAssociatedObject(self, _cmd, signal, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }

    return signal;
}

@end

Example usage:

[[AFNetworkReachabilityManager sharedManager].rac_reachabilityStatusChangeSignal subscribeNext:^(NSNumber *status) {
    AFNetworkReachabilityStatus status = [status integerValue];
    UALog(@"Reachability Status (1): %d", status);
    // Do something
}];

Subscribing to the signal will automatically start monitoring reachability status.