Objective-C

A collection of 38 posts

iOS

iOS - Creating Programmatic Layout without using Storyboard (Swift/Objective-C)

There are two ways of creating layout on iOS. First, using readymade storyboard provided by Xcode when you create a new project. And second, by manually creating a UIViewController subclass and assigning it to UIWindow object as a rootViewController in AppDelegate class. However, things have changed since Xcode 11 and

Xcode

Xcode symbolic breakpoints - Break at method call

Today I am going to write about the big advanced debugging feature of LLDB. I am calling it advanced because I myself didn't know about it for a long time. It allows you to add a symbolic breakpoint which will halt the execution at a specific point so that you

Minesweeper

Rewriting a Minesweeper - Part 3

Welcome to part 3 of the Minesweeper game. Today we will see logic behind some of the core and bonus features in the game. Highlighting tiles Tiles highlighting is triggered when user taps on one of the tiles which is not mine. This triggers a sort of chain reaction to

Minesweeper

Rewriting a Minesweeper - Part 2

Happy new year to all. I guess as I am getting old, I am not feeling enthusiastic enough about new years. There is one thing I am excited about though. Writing a rewriting Minesweeper game in Swift. Yesterday was quite a productive day in terms of my progress. Here's the

Minesweeper

Rewriting a Minesweeper - Part 1

I am going to being this series of post on how I found my 4 year old Minesweeper game project written in Objective-C and process to start converting it into Swift. My goals for this project are as follows: 1. Make sure to bring this project in stable state -

NSObject

Caveats while using Equatable with NSObject

Today I am going to talk about how to use Equatable with Swift and NSObject inherited objects. This is interesting because last week I came to know about the fact that Swift's inbuilt Equatable protocol does not play nice with objects inherited from NSObject Equality with Swift objects Let's look

Swift

Refactoring Gotcha

Today I am going to write about recent refactoring gotcha I ran into. Hopefully this won't be a long post as I usually do. So let's move directly to the coding example. I had a original code like this. (Which was needed to be refactored considering most recent requirement) // For

Swift 4.0

Using Swift variables in Objective-C : Swift 4 Edition

Today I ran into weird problem which prompted me to write this blog post on Objective-C and Swift interconnectedness. Before Swift 4 came along, the sure way to access Swift variables in Objective-C was to inherit class from NSObject (Swift structs cannot be used in the Objective-C) and prefix it

Facebook

An iOS library to apply Pride Effect

A Library to apply Facebook style pride parade effect to photos With the ongoing LGBT pride month, it reminds me of the pride effect I created a couple of years back. My original source of inspiration was Facebook which allowed people to overlay their photos with pride theme colors. I

Swift

Swift and Objective-C Interaction

In this post I am going to write how you can use Swift code in Objective-C and vice versa. I have run into this problem multiple times and every time I hit the wall. More importantly this post acts as a self reference to myself so that I can save

Objective-C

How to use @available attribute in Swift

Today I am going to write about attributes that Swift offers. Attribute is nothing but the construct which provides more information about declaration or type. As long as this blog post is concerned, I am going to keep the content specific to Declaration Attributes. Attributes can be specified with @ symbol

iOS

List of Interview Questions for iOS Developers

Over the years of iOS development has taught me some interesting facts about Objective-C and Swift. Some of them I learned from my own experience and most of them either from senior colleagues or other online resources (Attributions added to the end). Based on this knowledge I have compiled a

Objective-C

Objective-C blocks - Example and a Quick reference

This post is inspired by following Tweet when it was mentioned after years of experience, developer still could not remember the blocks syntax. After years of iOS development, I finally caved & made an xcode snip of an Obj-C block as a property. Still can never remember the syntax 🙈 — Jordan Morgan

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

Objective-C

Singletons in Swift

Please don't start a barrage on me just because I mentioned the word singleton. There are various use cases where you might want to use. For example, in one of our apps, we maintain the current account for the app. This user is maintained as a singleton object. Even if

UICollectionView

UICollectionView Tips

Most of us have used UICollectionView. It's like a swiss knife. Too complex to explore all the features it offers. I've used it on many occasions, but I still don't feel fully comfortable using it. To add up to that, I recently discovered UICollectionView features previously unknown to me. Here

iOS

iOS Unit Testing - Testing View Controller (Part 2)

This is the part 2 in the series of articles on 'Unit Testing on iOS'. Below is the list of all articles and respective links to them. 1. iOS Unit Tests - Testing models creation (Part 1) 2. iOS Unit Testing - Testing View Controller (Part 2) 3. iOS Unit

iOS

iOS Unit Tests - Testing models creation (Part 1)

This is the part 1 in the series of articles on 'Unit Testing on iOS'. Below is the list of all articles and respective links to them. 1. iOS Unit Tests - Testing models creation (Part 1) 2. iOS Unit Testing - Testing View Controller (Part 2) 3. iOS Unit

Objective-C

Using NS_DESIGNATED_INITIALIZER with Xcode6

One day I was working on one of my side projects. I came to know about NS_DESIGNATED_INITIALIZER Apple introduced in Xcode6. When you have choice of multiple initializers and still you want to init a model with specific initializer, you can use this keyword NS_DESIGNATED_INITIALIZER which

iOS

Interactive Notifications iOS

Note : This post uses Houston to send push notifications. Please refer to official Github page or my Previous post on how to send automated test push notifications - Push notifications with Accept/Cancel buttons In order to achieve this, let's create a method called registerForNotification in didFinishLaunchingWithOptions method from Appdelegate

iOS

iOS Custom URL Scheme

Today we are going to learn about custom URL schemes. I will write a tutorial in Swift, since I know lot of existing developers are now pro-Swift. But this code was written recently and things haven't changed much as long as Swift to Objective-C conversion goes. Browser to app transition

iOS

Macro for checking nil/NULL blocks

This is an easy and quick tip I came across while going through NSHipster's Reader Submissions - 2016. Sometimes we use the blocks which we may or may not be nil. Well, unlike other mechanism by which you can send message to nil object, you cannot call a nil/NULL

iOS

Change cell appearance on selection

As an iOS developer you might have run into situations where you want to change the cell appearance when particular cell is selected. Naive approach to this would be (Which by the way I did before I came to know about this little trick) to keep track of two indexPaths.

iOS

UITableViewCell automatic height management

We all know that iOS8 brought in really nice changes. Well, it be will be too long post to describe all of them. But I will talk about one of my most favorite features Apple added into this release. Automatic height management for UITableViewCell with Autolayout Yes, you can fit