Setting Global Value in Objective C

Setting and getting value using a global singleton in objective c is a programming pattern that allow you store in the system memory.

There’s a lot of discussion regarding this design pattern both on the pros and cons, visit the following to read more.

To Setup the Singleton Object in your Xcode project.

1. Create a class (.h/.m) and name them GlobalSingleton.

2. In the GlobalSingleton.h file, add the following section of codes.

#import <Foundation/Foundation.h>


@interface GlobalSingleton : NSObject


//This are the property you are going to store in the Singleton object

@property (nonatomic, retain) NSArray *array_SideViewOptions;


@property (nonatomic, retain) bool *offline;


+(GlobalSingleton*) getValues;




Notice the Singleton Properties, these are the different type of properties you intend to store inside the object.

3. In the GlobalSingleton.m file, add the following section of the codes.

#import GlobalSingleton.h

static GlobalSingleton* singleton;

static dispatch_once_t pred;

@implementation GlobalSingleton


@synthesize offline;

@synthesize array_SideViewOptions;


+(GlobalSingleton*) getValues{


    dispatch_once(&pred, ^{

        singleton = [[GlobalSingleton alloc] init];







Notice the synthesize portion, thats allow you have to do in future if you add more properties.


Using the Singleton – Setting Value.

#import “GlobalSingleton.h”

[GlobalSingleton getValues].array_SideViewOptions = [[NSArray alloc]initWithObjects:@“apple”,@”Spidy”,@”Settings”,@”Feedback”, nil];

Using the Singleton – Getting Value.

#import “GlobalSingleton.h”

array_SectionOne = [GlobalSingleton getValues].array_SideViewOptions;



Using Reachability to test for Internet Connectivity IOS

Any apps that you build today will require some form of internet connectivity.

Today’s app is getting more and more intuitive and should have the ability to check on the internet connective and prompt the user of the app.

To do that we will be using the following library, Reachability.

There are 2 ways to setup the app in your Xcode project.

Part 1 : Getting Reachability to your project

1. Manual

1.1 Check out a copy from the above github url, add the Reachability.h/.m file to your project

2. Cocoapod

2.1 Add the following line to your pod file, pod ‘Reachability’

2.2 Run pod install on terminal.


Part 2: Setting up the SystemConfiguration Framework.

1. Go to the Project -> Targets -> Build Phases tab.

2. Add SystemConfiguration.Framework into your project.


Part 3: Codes to set up Reachability to test internet connectivity.


Import the Reachability.h, at the very top of the file.

#import “Reachability.h”


Within the method,

– (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

Add the following codes

 Reachability *reachability = [ReachabilityreachabilityWithHostname:@”http://localhost:3000/”];


    reachability.reachableBlock = ^(Reachability *reachability) {

        NSLog(@”Network is reachable.”);



    reachability.unreachableBlock = ^(Reachability *reachability) {

        NSLog(@”Network is unreachable.”);



    // Start Monitoring

    [reachability startNotifier];

WireFrame: Balsamiq vs Moqups


The tool ship with varies different version, there’s a subscription version online and a desktop version. The desktop version support both PC and Mac.

On first impression, balsamic allow you to quick design either a web page or mobile application. It ships with elements or controls that allow you to quickly drag and drop then with minimal fuse.

I really like Balsamiq for the near zero learning curve and the only cons is that you need to working on either a PC or MAC to use this.



This is a subscription-based version, the learning curve and features are very similar to Balsamic.

As it is build on the latest HTML 5 technology, I can work on the wireframe on any iOS device via the Safari app. Obviously, trying to design it on a iPhone will be a challenge.