iOS developers are building applications that play both roles Peripheral and Central to exchange data with other copies apps. The data can be exchange a small of information via BLE packets or the signal strength indicator (RSSI) value from one to the others. However, keeping the app last forever in the foreground is impossible. Sooner or later, the app will enter to background mode by the user and finally will be suspended by the system depending on RAM available, power consumption and other factors. Thus, understanding the procedure of advertising and scanning on iOS devices helps you to build good applications that fit your expectations.
At the end of this tutorial, we will build a simple application that acts as both a scanner and an advertiser. When two applications find each other, they will write a log record for analysis. Depending on the results, we will find out how effective our application is using Core Bluetooth.
Let’s switch the gear!

As your iOS development skill is growing, I believe you use UIScrollView, UICollectionView, UITableView, and other native views regularly and proficiently in your applications. Yet, some iOS developers still don’t know what exactly UIStackView is, what it uses for or in which situation should we use UIStackView.
In this tutorial, I will introduce you to UIStackView - A view helps us to simplify our iOS layouts.

Let’s imagine you’re going to build an application that allows the user to add or remove views in run time. Remember how we will accomplish this task? We first have to remove all constraints in the relative area and update them all over again. Or remember the case where you implement the sign-in / sign-up view, you add many text fields and manually set constraints between those views. In such situations, UIStackView appears to be more useful than other views.

If you ever have a chance to work with networking on iOS, you definately have heard about Alamofire, a networking library written in Swift for iOS and MacOS. It simplifies all of the common networking jobs in your app.
If you have not meet Alamofire yet, no worries, this tutorial will introduce you all tasks that Alamofire can handle for you. If you’re familiar with it, never mind, take this post as a summarize and a centralize of your Alamofire handbook.
Let’s drive in!

Coming soon!

To see #5 top updates in iPadOS 14.

In the previous post, I basically give you a quick look at iBeacon - A Bluetooth protocol built on top of BLE by Apple, and made a simple demo of how iBeacon can wake up an application after being terminated by the user. However, I did not mention other foundation concepts in Beacon, it also did not give you a deep look at the advantages and disadvantages of this powerful technology.
Today, I would like to introduce you to a good book giving a solid knowledge in Beacon field, especially iBeacon: Building Applications With iBeacon published by O’Reilly.
After reading this book, I ensure that you will get a good knowledge in iBeacon field and your mind will be more open to the next coming up ideas.
Let’s drive-in!

In the previous post, Advanced iOS Concurrency: Operations, we walked through the Operation concepts on iOS and made a demo application that fetches some posts of mine. After downloading the cover images, they will be applied to a simple filter, then be displayed in a table view. The application, however, has not been completed yet. There’s something that went wrong with our app making the app did not show downloaded images properly. In this tutorial, we will continue where we left off.
Get ready!

There are two techniques to deal with Concurrency in iOS: GCD - Grand Central Dispatch and Operations. Most of the time, GCD provides most of the concurrency capabilities you need. Yet, sometimes you’ll want some extra advanced customizations. It’s time to use Operations. This tutorial will introduce Operations in Swift, also explain when and why we use Operation instead of GCD.
Let’s switch the gears!

There is a big gap between knowing the path and walking through the path.

As I build this personal site, my first aim is to enjoy my hobby of writing. I write whatever I learn on along with my daily working, and share it. I hope my share will help someone when they need it. In return, I will have a deep of understanding what I write, and sometimes, receive “a cup of coffee” (Buy me Coffee) from a friend I’ve never met. ☺️

Power is gained by sharing knowledge, not hoarding it

Some friends come to me asking how to build a page like mine. I’m happy to share with you how I build it.
After this tutorial, you can build your own site within 5 minutes.
I hope to see your page launching soon!

As an iOS developer, you might have heard about TestFlight - a product of Apple that allows you to distribute your apps to beta users. So what can we do with it? Is it useful?
In this tutorial, we will walk through steps uploading a build to TestFlight, and invite users to test your app.
You also need to refer the previous post Shipping your app to Store to complete this tutorial.
Let’s have fun!

While I was searching for a book to boost my iOS development skill, I found this Swift Apprentice book on Raywenderlich’s book store. Take a quick look at the content of the book, I decided to add the book to my library.
Generally, If your iOS skill is mid-level or senior, you’re so confident with your master programming skill, this book is not for you. But if you’re looking for a book to strengthen your knowledge, or you just want to make sure everything you understand about Swift language is right - as my purpose, then take this book with you.
You’ll learn about very basic things like function, method, constants, control statement, etc. You’ll also have a chance to get in-depth knowledge about Stack/Heap allocation, protocol-oriented programming, and generic programming, which make your daily job more convenient, and you will find yourself like a master in Swift language.
Let’s drive-in!