RAC example for ben

IATBenHowdleViewController.m

//
//  IATBenHowdleViewController.m
//  Visit
//
//  Created by Jon Gold on 15/07/2014.
//  Copyright (c) 2014 Internet & Things. All rights reserved.
//

#import "IATBenHowdleViewController.h"
#import "IATStore.h"

@interface IATBenHowdleViewController ()

@end

@implementation IATBenHowdleViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if (self) {
    // Custom initialization
    
    // actually this should be passed in somewhere else but you get the idea - maybe '-initWithStore:(IATStore)store' or something from the previous view controller.
    IATStore *store = [[IATStore alloc] init];
    
    UILabel *tweetCount = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 40)];
    [self.view addSubview:tweetCount];
    
    RAC(tweetCount, text) = [store.tweetCount map:^id(NSNumber *count) {
      return [NSString stringWithFormat:@"%@ tweets", count];
    }];
    
    UIButton *sendTweet = [[UIButton alloc] initWithFrame:CGRectMake(0, 60, 320, 40)];
    sendTweet.titleLabel.text = @"Send a tweet!";
    
    sendTweet.rac_command = store.updateTweets;
    
  }
  return self;
}

- (void)viewDidLoad
{
  [super viewDidLoad];
  // Do any additional setup after loading the view.
}

@end

IATStore.h

//
//  IATStore.h
//  Visit
//
//  Created by Jon Gold on 15/07/2014.
//  Copyright (c) 2014 Internet & Things. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface IATStore : NSObject

@property (nonatomic, strong) RACSignal *tweetCount;
@property (nonatomic, strong) RACCommand *updateTweets;

@end

IATStore.m

//
//  IATStore.m
//  Visit
//
//  Created by Jon Gold on 15/07/2014.
//  Copyright (c) 2014 Internet & Things. All rights reserved.
//

#import "IATStore.h"

@interface IATStore ()

@property (nonatomic, strong) NSArray *tweets;
@property (nonatomic, strong) NSNumber *userLoggedIn;

@end

@implementation IATStore

- (instancetype)init {
  if (self = [super init]) {
    
    self.tweets = @[
                    @{@"from": @"benhowdle",
                      @"text": @"I love Jon. Jon is awesome"}
                    ];
    
    // move this to an account class or something
    self.userLoggedIn = @(YES);
    
    // observe tweets array, map it into an NSNumber count
    self.tweetCount = [RACObserve(self, tweets) map:^id(NSArray *tweets) {
      return @([tweets count]);
    }];
    
    
    RACSignal *userLoggedInSignal = RACObserve(self, userLoggedIn);
    
    self.updateTweets = [[RACCommand alloc] initWithEnabled:userLoggedInSignal signalBlock:^RACSignal *(id input) {
      
      // Update the store here I guess
      
      return [RACSignal empty];
    }];
    
  }
  
  return self;
}

@end