Wednesday, August 31, 2016

MQTT 101 – How to Get Started with the lightweight IoT Protocol

Everybody talks about the Internet of Things nowadays. Increasingly affordable micro controllers like Arduino and Raspberry Pi are enabling cheap devices that measure sensor data and send it over the internet. The goal of this post is to introduce the lightweight protocol MQTT and its capabilities to send data between devices and other systems and to demonstrate them by implementing two clients with Eclipse Paho.

The term Internet of Things was first used by Kevin Ashton in 2009 for interconnecting physical devices over the internet. The basic idea is very simple: Physical devices can exchange data between each other or being controlled by others. Examples of such devices would be a refrigerator, a car, a building or basically any other electronic device. One of the most common use cases is the collection, transmission, consolidation and displaying of sensor data. The results could be a web dashboard with the aggregated values or an alarm, when a threshold is exceeded.


The application scenarios are almost unlimited. Imagine your alarm clock would know that your train to work is 15 minutes late and adjust itself accordingly. Also your coffee maker is switched on automatically 15 minutes later to make you a hot cup of coffee before you leave for work. Sounds like the future ? All that is already possible today. Ericsson predicts that in 2020 50 billion devices are connected over the internet. The communication between the huge amount of devices is enabled by IPv6 and lightweight communication protocols like MQTT.

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MQTT​, Internet Of Things, IOT, IoT Protocol, Machine to Machine, M2M, RSMB, LWT, Broker​

Tuesday, August 30, 2016

Changing App Store Seller Name

Changing your seller name on Apple's App Store is not a straight-forward process. There are several caveats and ways to accomplish a name change. In the absence of any formal process, here are two methods for changing your seller name.

A good video to explain the process of transferring application us here



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​Application Transfer

Monday, August 29, 2016

Localization in iOS apps made simple

Localizing iOS apps with the standard tools is tedious, especially when you use Interface Builder files. To resolve that, I have created a new tool called AGi18n that makes it extremely easy. But let's first start by analyzing the existing approaches for it together with their problems, to later introduce the library and all the goodies that you get from it.

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Friday, August 26, 2016

iOS: Thoughts On AlamoFire - Swift’s AFNetworking Implementation

The HTTP protocol is synonymous with modern development. The experienced iOS developer understands and likely works with the popular protocol on a daily basis.

Unsurprisingly, iOS apps are no different in this regard. Thousands of apps and their engineers have trusted the popular AFNetworking library with everything from communicating with servers, parsing JSON, to providing place holder images while the intended ones are still being served up.

In short — it's a tough act to follow. This week, we'll look at the library intended to do just that: Alamofire.


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Designing for Television, Part 1

Welcome to the new Golden Age of television. Not only is there more great television being produced than ever before, but we also have more choice in how we watch our favorite shows. And while we can access these shows anywhere and anytime through our computers, phones, and tablets, televisions themselves still maintain a special place in the home of many.

But we're no longer limited to a remote and cable box to control our TVs; we're using Smart TVs, or streaming from set-top boxes like Roku and Apple TV, or using video game consoles like Xbox and Playstation. And each of these devices allows a user interface that's much more powerful than your old-fashioned on-screen guide.

When compared to computers and even mobile phones, designing UIs for TV is still a relatively new area. It's also a fundamentally different platform. Design for TV requires a unique set of considerations, including screen size and distance, technical constraints, and context of use.

This will be the first part of a series that digs into how to start thinking about interfaces for TV. We'll also be focusing specifically on the gamepad as an input device, and the basics of using the Gamepad API. In Part 2, we'll show how you can prototype your TV UIs & controllers together.


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Implementing MVVM in iOS with RxSwift

There are countless articles on MVVM in iOS, but few focus on what MVVM looks like in practice and how to actually do it. This is an article about MVVM from a more practical standpoint, using RxSwift.


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Simple ways to improve your application Architecture

I'm an Android app development rookie, with roughly four months of coding experience. And as I've grown more and more knowledgeable of Android fundamentals, I decided to look upon my very first projects as a rookie. I realised that my starting code was sloppy and just all over the place, so recently I've been trying out a new approach to both my application and code structure, which is widely known as MVP — an abbreviation for Model-View-Presenter software architecture.


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iOS: How to store your users’ last network request for seamless app launch with Swift

I've got a pretty slow mobile connection, and often get frustrated when I have to stare at a spinner while I'm waiting for some app to load. A great way to improve this would be to save the loaded content into a persistent store, and display that content on next app launch.

This is how the iOS Weather app works. Try to put your phone into airplane mode and launch the app. You will see that it displays all the data it had the previous time you've launched the app, even though you're not connected to the Internet. This leads to a much better user experience, since you're giving users something to look at other than a spinner.

This is especially good with apps that have feeds from the network, since users can see cool content before more content loads.


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​Swift​,Caching

Architecting Android with Data Binding and MVVM in mind

When Google announced Data Binding Library at last year Google I/O, I was thinking "oh man, this is the next big thing in Android development". And yeah, the hype was real (for the next two weeks), and it all kinda disappeared. My thoughts are that developers were so into MVP and Rx that they did not have any time to experiment with Data Binding. And also, you cannot "just" use Data Binding, you need to spend some time learning it and change your application's architecture to write a testable Android Application with Data Binding in mind.


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​,Android Data Binding,Android MVVM​,Architecting Android

A look at UIView Animation Curves (Part 1)

So… The design team just asked you to make an animation sexier and you went pale. What did they mean? The situation then got more awkward as they started talking about key frames and animation curves.

Motion graphics applications offers a lot of flexibility and to a designer there may sometimes be an expectation that the same flexibility is found in Swift / Cocoa Touch. Of course we all know that Swift is awesome and everything is possible but let's stick to the basics.

✔ Read More...


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​,UIView,Animation Curve,Animation​

Easy Animation with UIStackView

UIStackView leverages the power of Auto Layout by managing the layout of all the views inside. You can change property of UIStackView or its arranged subview, and place these changes inside an animation block.

✔ Read More...

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UIStackView
​,Animation

swift: Use auto-describing objects with CustomStringConvertible

It is also important to keep these logs as readable and understandable as possible. Wouldn't it be great if whenever we try to print an object to the console we will get an exact description of the object? Including all of it's properties and their current values?


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​Swift

Thursday, August 25, 2016

iOS : Delegates vs Observers

A well structured app consists of simple objects with well-defined responsibilities talking to each other. When you design an object, you might think of an object's properties, and the actions they take, but it's just as important to decide how they'll communicate.

Cocoa provides a handful of patterns without much guidance on their use. Today, let's contrast delegates with observers.


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iOS : How to use Vector images in Xcode

In these days, where there are a lot of devices with a lot of screen resolutions out there, working with images can be painful. iPad has a screen resolution, iPhone has another resolution, the big iPhone has another one… It could be worse, it could be Android: a lot of manufacturers with each one working with a screen resolution that they think is the appropriate one.

So, how to deal with that? Should I export that image in different resolutions for each screen size? Yes, this is a solution! A painful solution, but it is still a solution. Each tiny modification in the image, a lot of export, again.


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Monday, August 15, 2016

Inversion of Control, Dependency Injection and Service Locator in C#

In this article, we will learn:

What is Dependency Inversion Principle (DIP)
What is Inversion of Control (IOC)
What is  Service Locator?
What is Dependency Injection?
Difference between DIP and IOC (DIP vs IoC)
Difference between Dependency Injection and Service Locator (DI vs SL)

✔ Read More...


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C#,.NET,Architect,Intermediate,VS2010,.Net,Articles,Computer Tutorials
​,​
Inversion of Control, Dependency Injection
​,​
Service Locator in C#

Difference between Covariance and Contravariance in C# Generics

In this article, we will discuss:

- Covariance in Generics
- Contravariance in Generics
- The difference between Covariance and Contravariance in C#

✔ Read More...


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C#,.NET,Architect,Intermediate,VS2010,.Net,Articles,Computer Tutorials
​,​
C# Generics
​,​ C# 
Covariance
​, ​C# 
Contravariance

11 Must-Have Resources & Tools for Freelancers

Being a freelancer comes with added freedom, but also requires a lot of extra adulting that you don't quite have to do as an employee at a company. You have to track your time more diligently, pay taxes quarterly, manage erratic payment schedules, and more. Luckily, you don't have to do all of it on your own. There are hundreds of great tools built to specifically make your life as a freelancer or independent contractor much easier. Check out the list below for 11 of our favorite must-have freelance tools—and check out Product Hunt for dozens of other great resources and products here.

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​, Tools, Freelancers​

HOW TO MAKE LOCAL NOTIFICATIONS IN IOS 10

I've written before about local notifications in iOS. However, Apple has changed all that starting in iOS 10. In versions earlier than iOS 10, notifications were part of UIKit, but required the developer to make changes to the view controller and app delegate. Different types of notifications had different code. In iOS 10 notifications unifies the coding of notifications into the view controller. There are two types of notifications: Local and remote notifications. Remote notification require connection to a server which pushes the notification to your device. These are beyond the scope of this lesson. Local notifications are notifications for events that happen on your device. We'll set up these types of notifications in this lesson

✔ Read More...


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​,​iOS10,LocalNotifications

Objective-C vs Swift: what to choose?

There is an ongoing debate about choosing Objective C or Swift for new project when creating an iOS application. Many professional developers are engaged in this Objective-C vs Swift debate. Some of them prove that Objective-С is the best programming language ever. Meanwhile, the camp of Swift supporters grows every day.
While the two camps are arguing, startups still doubt should they build new iOS projects in Objective-C or Swift. From a business perspective, new applications should be written fast, without delay, bring profit and be a long-term success. If you are one of the business owners, you start wondering what will work for you.
Surely, you may have heard from the IT old-timers that Objective-C is the best option for all times. At least, you could hear the following:

✔ Read More...


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​,Swift

Machine Learning for iOS

WWDC16 just ended and Apple left us with new amazing innovative APIs. This year speech recognition, proactive applications, machine learning, user intents, and neural networks have been the most frequent terms used during the conference. So, besides a new rich version 3 of Swift, almost every new addition to iOS, tvOS and macOS is related with artificial intelligence. For example, Metal and Accelerate in iOS 10 provide an implementation of convolutional neural networks (CNNs) for the GPU and CPU respectively. During the keynote, Craig Federighi (Apple's SVP Software Engineering) showed how the Photos app on iOS organizes our photos according to different smart criteria. He highlighted that Photos app uses deep learning to provide such functionality. Also, Federighi showed how Siri, now available to developers, can suggest what we need.

✔ Read More...


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​,
accelerate,computer vision,convolutional neural network,ios,machine learning,machine vision,metal,tvOS,Machine Learning,Machine Vision,Neural Network

Apple Watch Home Screen UI Animation

Apple Watch is almost here and everybody is waiting to play with this nice new toy. In the last two keynotes, Apple showed us Apple Watch and the amazing UI gives iOS developers new innovative design options that will make iOS apps feel intuitively alive. Two weeks ago, we had the opportunity to test our app on an Apple Watch during a lab in Cupertino. This tutorial is especially cool because it examines the technological depth of the new Apple Watch UI animation.


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Apple watch,Collection Views,ios,UIKit,User Interaction,Apple Watch,Collection View,Core Animation,iOS Development,Swift,UI Animations,UIKit,WWDC

Tuesday, August 9, 2016

iOS: How to implement partial and full page curl animation in iOS app

Hello friends, today in this tutorial I will show you, how to implement custom page curl animation on any UIView. You can also use this technique on UIImageView to change image. Sometime is our iOS app we need to change image or a view with animation. In this tutorial I will show you, how to implement both semi and full page curl of UIView.


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​,Animations,Page Curl​

Monday, July 18, 2016

Storage device writes information atom-by-atom

The quest for storage devices that pack more information into a smaller space has reached a new limit, with memory that writes information atom-by-atom.

Dutch scientists developed rewritable memory that stores information in the positions of individual chlorine atoms on a copper surface.

The information storage density is two to three orders of magnitude beyond current hard disk or flash technology.

Details of the advance appear in the journal Nature Nanotechnology.

The 1 kilobyte memory is the work of a team led by Sander Otte at the Technical University of Delft (TU Delft). With each bit of data represented by the position of a single chlorine atom, the team was able to reach a density of 500 Terabits per square inch.
"In theory, this storage density would allow all books ever created by humans to be written on a single post stamp," said Dr Otte.

Or, by another measure, the entire contents of the US Library of Congress could be stored in a 0.1mm-wide cube.

The researchers used a scanning tunneling microscope (STM), in which a sharp needle probes the atoms on the surface one by one.

✔ Read More...


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Stretching a image in iOS using colorWithPatternImage

We can do some image resizing to achieve this. Use this helper method to resize image and then use it in colorWithPatternImage method call.

This is the resizing helper method.

-(UIImage *)imageResize :(UIImage*)img andResizeTo:(CGSize)newSize
{
    CGFloat scale = [[UIScreen mainScreen]scale];

    //UIGraphicsBeginImageContext(newSize);
    UIGraphicsBeginImageContextWithOptions(newSize, NO, scale);
    [img drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

And this is how to call it inside your colorWithPatternImage method.

[separatorLineView setFrame:CGRectMake(10, 0, 180, 3)];
separatorLineView.backgroundColor = [UIColor colorWithPatternImage:[self imageResize :[UIImage imageNamed:@"divider.png"] andResizeTo:separatorLineView.frame.size]];

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Sunday, July 17, 2016

List of Fonts Available on the iPhone

How to use fonts in iOS

UIFont *mainTitleFont = [UIFont boldSystemFontOfSize:14.0];
UIFont *subTitleFont = [UIFont SystemFontOfSize:14.0];
UIFont *textFont = [UIFont italicSystemFontOfSize:12.0];

And with font name,

UIFont *altFont = [UIFont fontWithName:@"Courier-Bold" size:14.0];

And how to get all fonts in iOS SDK

NSArray *familyNames = [[NSArray alloc] initWithArray:[UIFont familyNames]];
  NSArray *fontNames;
  NSInteger indFamily, indFont;
  for (indFamily=0; indFamily<[familyNames count]; ++indFamily)
  {
      NSLog(@"Family name: %@", [familyNames objectAtIndex:indFamily]);
      fontNames = [[NSArray alloc] initWithArray:
          [UIFont fontNamesForFamilyName:
          [familyNames objectAtIndex:indFamily]]];
      for (indFont=0; indFont<[fontNames count]; ++indFont)
      {
          NSLog(@"    Font name: %@", [fontNames objectAtIndex:indFont]);
      }
[fontNames release];
}
[familyNames release];

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Print all iOS fonts in Swift

Handy function that I always forget

func printFonts() {
    let fontFamilyNames = UIFont.familyNames()
    for familyName in fontFamilyNames {
        println("------------------------------")
        println("Font Family Name = [\(familyName)]")
        let names = UIFont.fontNamesForFamilyName(familyName as! String)
        println("Font Names = [\(names)]")
    }
}

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iPad,iPhone,iPhone Resources,iPhone Articles,iPhone Development,iPhone Turorial,Mobile Development Tutorials,Mobile Developments,
​Swift, UIFont

Saturday, July 16, 2016

How to remove extra empty cells in TableViewController, iOS - Swift

in your viewDidLoad() function add this line of code:

tableView.tableFooterView = UIView()

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iPad,iPhone,iPhone Resources,iPhone Articles,iPhone Development,iPhone Turorial,Mobile Development Tutorials,Mobile Developments,
​Swift

Thursday, July 14, 2016

First Steps: Exploring .NET Core and ASP.NET Core

.NET Core and ASP.NET Core 1.0 are finally here, and in this post I'll show how to get started with these new tools using the command line tooling. This is not meant to be your typical getting started tutorial that jumps right into Visual Studio and creates a Web project from there. Rather, the purpose of this post is to demonstrate some of the core underpinnings of how .NET Core and ASP.NET Core projects are bootstrapped and using the command line tooling is actually the best way to demonstrate this.

I'll start at the beginning with 'HelloWorld' then add additional pieces and ASP.NET and demonstrate how to deploy and then run the application both on Windows and a Mac.

✔ Read More...


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.NET,Architect,Intermediate,.Net,Articles,Computer Tutorials
​, .Net Core, ASP.Net Core

How to Create an Xcode Source Editor Extension

Xcode is the main IDE (Integrated Development Environment) used by thousands and thousands of developers every day. It is an awesome tool, but sometimes you want to customize some of its features and behaviors to better fit your workflow.

Until Xcode 7, it was possible to inject code into Xcode at runtime to create plugins. Plugins could be submitted and distributed through a great app called Alcatraz. This is no longer possible in Xcode 8.

Xcode 8 validates each library and bundle to prevent malicious code from running without your permission. When Xcode starts, previously installed plugins with Alcatraz are not loaded anymore. Not everything is lost though, Apple also announced at WWDC the possibility to develop Xcode source editor extensions so that everyone can extend existing source editing features. Let's take a look about what we can achieve with such extensions.

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​,xCode, ​
Xcode Source Editor Extension

Magical Error Handling in Swift

Error handling in Swift has come a long way since the patterns in Swift 1 that were inspired by Objective-C. Major improvements in Swift 2 make the experience of handling unexpected states and conditions in your application more straightforward.
Just like other common programming languages, preferred error handling techniques in Swift can vary, depending upon the type of error encountered, and the overall architecture of your app.
This tutorial will take you through a magical example involving wizards, witches, bats and toads to illustrate how best to deal with common failure scenarios. You'll also look at how to upgrade error handling from projects written in earlier versions of Swift and, finally, gaze into your crystal ball at the possible future of error handling in Swift!

✔ Read More...


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​Swift

INJECTING CONFIGURATIONS IN RAZOR VIEWS IN ASP.NET CORE

This article shows how application configurations can be injected and used directly in razor views in an ASP.NET Core MVC application. This is useful when an SPA requires application URLs which are different with each deployment and need to be deployed as configurations in a json or xml file.

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C#,.NET,Architect,Intermediate,VS2010,.Net,Articles,Computer Tutorials
​, Razor Views, ASP.Net Code, ASP.Net

Credit card scanning for mobile apps

This repository contains everything needed to build the card.io library for iOS.

What it does not yet contain is much in the way of documentation. 😿 So please feel free to ask any questions by creating github issues -- we'll gradually build our documentation based on the discussions there.

✔ Read More...


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iPad,iPhone,iPhone Resources,iPhone Articles,iPhone Development,iPhone Turorial,Mobile Development Tutorials,Mobile Developments,Objective C
​,Card.io, Github

SQL 2016 - New Features

SQL Server 2016 was (finally) released on June 1st, 2016. with an initial build number of 13.0.1601.5. Microsoft build SQL 2016 keeping lot of things in mind like Cloud first, Security enhancement, JSON support, Temporal database support, Row level security, Windows server 2016 connectivity, Non-relational database connectivity (e.g. Hadoop), rich visual effects etc.

In this article we will take a walk-through all fresh SQL 2016 features and cover them one by one.

✔ Read More...


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Architect,Intermediate
​, 
Articles,Computer Tutorials
​, SQL Server, SQL Server 2016

Building an Instagram Based Portfolio With Bootstrap

In this tutorial I am going to run through the process of creating the simple Instagram based portfolio as designed in a previous tutorial by Tomas Laurinavicius.

Thomas has done a great job keeping the design simple, spacious and functional so I think it's only fair we do the same when building it. To make our lives easier we are going to rely on a few tools and libraries so let's begin by taking a look at them.


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Architect,Intermediate,Articles,Computer Tutorials
​, SAAS​, 
Bootstrap
​, ​
Instagra
​m​