Tutorial

A collection of 52 posts

iOS

What I Learned from My Recent Experience Creating iOS Tutorial

Recently, I was asked to write a tutorial and build an iOS app prototype to teach high-school students how to write iOS apps. The goal was to create a basic project that will include all the basic iOS concepts they've learned so far and build the app on these foundations.

Combine

Building a Network Service in Swift Using the Combine Framework

Hello readers! Welcome to another blog post. Today we are going to see how to build a generic network service using Apple's Combine framework. Making network calls from the app is the bread and butter of any standard iOS application. Today, we will see how to build a network service

UICollectionView

Tutorial - Creating Programmatic UICollectionView in Swift

Creating a UICollectionView could be stressful - As compared to dealing with UITableView. But things don't have to be this way for so long. Every time I have to add a CollectionView in the app, I end up spending long time trying to figure out what did I do last

Sound

Playing audio file on iOS in Swift 4

Playing media file in apps is fun. Media usually puts constraints on system resources, but it is ok to indulge in fun once in a while. In this post we will see how to play audio in the iOS app. Given the high impact of size on the app download,

Xcode 9

Random Xcode Trick

Despite my regular rantings on Xcode and Apple software, I still love them. In past few years, I have used so many IDEs and trust me, Xcode is one of the best I have seen. However, it has its bad times and tantrums - But it is understandable with its

UIKit

Using Autolayout to Dynamically Resize UILabel

We all love Autolayout, don't we? I had a less than ideal experience with it when I started. However, after continuous practice and reading a Book - iOS Auto Layout Demystified I got more comfortable with it. However, there are certain cases where it's still possible to solve problem with

iOS

Wrapper for 3D touch preview implementation using Swift 3.0

It's been a while since I started working on 3D touch implementation on iOS 6s Plus devices. Luckily, even through it's a hardware feature iOS simulators still supports simulation of 3D touch of supported devices. I wrote a sample project demonstrating the use of 3D touch along with blog post

iOS10

Core Data with Mantle in Swift

Today we are going to talk about how I used Core data in conjunction with Mantle wrapper to directly store and retrieve data out of database without directly interacting with Core data. This involves the significant portion of MTLManagedObjectAdapter object which is a wrapper around core data. All we have

JavaScript

How to live edit any webpage

I learned this trick to edit any web page on the fly long time ago. It was fun in the beginning and good technique to prank friends. With this technique when you type a single command in the Chrome debugger, it lets you edit any part of webpage as if

Apple

Indirect enums - Swift 3.0

Enums are one of my favorite parts in any language. With Swift they've got extra functionality such as adding functions, associated values and Indirect Enums. So what are indirect enums? I have learned enums in other language, but never came across any language which offers similar functionality. At least not

Github

Using Global .gitignore on Mac

If you're a Git user, there is high chance you might be using .gitignore file to ignore certain files from being committed into your remote repo. Now, .gitignore file differs for different languages, frameworks and packages. If you have several repositories maintaining multiple .gitignore files for them could be painful.

Swift 3.0

Equality and Comparison with custom objects in Swift (Equatable protocol)

Few weeks ago I ran into frustrating problem. I was dealing with custom objects in Swift. (Actually struct with properties). They were being stored in an array. Now, this array was going to undergo frequent activity due to user action such as adding new elements and avoiding duplicates. So while

Swift 3.0

Beauty of Swift

Today I am going to talk about couple of Swift tricks I learned recently. First one is about operator associativity and how Swift handles it gracefully to error it out during compile time and other is how function overloading is so much fun in Swift Operator Associativity We all know

iOS

Creating Custom Operators in Swift with Generics

Swift introduced us to a new era of custom operators. Unlike Objective-C, it allows us to define our own operators and perform operator overloading on existing operators if necessary. We will see both of them in detail in today's article. Custom operators can provide excellent clarity and flexibility down the

JavaScript

JavaScript Closures Fun

JavaScript closures are fun. Not just because they're are sometimes hard to understand, but they make interview questions interesting to tackle. Today I am going to write about one such JavaScript interview question involving nested closures. You may probably find it easy to reason about once solution is presented, but

Swift 3.0

Tail Recursion Optimization

Recently I came to know about amazing concept of tail recursion optimization. If you are a computer scientist, you must be knowing what recursion is. It is a function calling itself multiple times until certain edge condition is reached. When an edge condition is reached, it returns the result at

iOS

Manually scrolling UIScrollView (iOS/Swift)

Recently while working with one of my libraries, I realized that I wanted to manually scroll UIScrollView in any direction. (Viz. Top, Right, Bottom, Left). It took me quite time to find examples online. But I take this moment to compile them together. Since Swift is a hot word in

iOS

Creating Image Slider with UIKit APIs

Thanks to Nick Lockwood's book iOS Animation Advanced Techniques. I was able to write another implementation of Image slider. I wrote an image slider couple years back using UIScrollView for which I had to write manual routine to slide images back and forth. However, this time I used techniques iOS

Swift

iOS - Autolayout and Resizing UILabel (iOS/Swift)

Last week I had weird issue while applying autolayout rules to UITableViewCell. TableViewCell has two components attached to it. 1. An UIImageView 2. Two variable length UILabels stacked vertically on the top of each other And I wanted tableView cells to look like this, Nice, isn't it? Let's look at

Objective-C

Thinking MVVM way with Objective-C

Today I am going to write about one of my most favorite iOS patterns lately. MVVM (Model-View-ViewModel). They say MVC has been in iOS realm for quite a bit. However, if you ask me, MVVM is going to be a big. Advantage being, you can create viewModel once and then

Tutorial

Simulate View Controller Transitions - iOS/Objective-C

We all have dealt with push transition of UINavigationController as well as presentViewController and dismissViewController transitions of typical UIViewController. However, today we will learn how to emulate the transition from one viewController to another without moving to a new viewController. The technique is quite simple and I will only explain

iOS

iOS Add spacing to line of text - Swift

This week while working on one of our internal apps (Again), I came across an interesting problem to add spacing to line labels. I never knew iOS could do it. My first and very naive solution was to have multiple UILabels and arrange them vertically. But this would cause a

iOS

Add image to UILabel with Swift (iOS)

This week while working on one of our client apps I came across interesting problem of embedding images with text. To give a little idea, we wanted to display text somewhat like emojis embedded in the message. Doesn't that look cool? It definitely does. Initially I drew the conclusion of

iOS

Animated Progress Percentage Label Library

I have been thinking about creating an animated progress percentage counter library open source and finally I have done it. In this blog post I am going to talk in more depth regarding technical details of this library. This animated progress percentage counter is live and available on GitHub. It

Swift

Special Literals in Swift

Today I learned about special literals in Swift. These literal won't add any functionality benefits to your code, but are excellent while debugging and pinpointing error and bugs. There might be more, but here is the list of literals I came across today. * #file Outputs the name of the file