Blog

I like to write about iOS Development, Swift, Apple & Computer Science concepts.

Implementing Core Data In SwiftUI Using MVVM Architecture

I would like to start off by saying that this is not the only way to implement CoreData and there are various ways you can do it. This is just my way of implementing CoreData using MVVM architecture. Any suggestions, or feedback is highly appreciated.

Making Textfield First Responder in SwiftUI using FocusedState

Apple unveiled SwiftUI - a UI framework for native iOS development back in 2019. Since then it has improved quite a lot and while some may (me included) still think that it has still long way to go however, annual updates to SwiftUI has made it immensely powerful and is now closer than ever to reach that point of completion.

Drawing Smooth Cubic Bezier Curve through prescribed points using Swift

So I wanted to plot some data and decided to create a simple line graph using UIBezierPath. It worked but I wasn’t happy with it. Then I decided to use the quadratic bezier curve method that requires two end points and one control point. Still wasn’t happy with result. Then came the turn of the Cubic bezier curve, that requires two control points and two end points. I knew I needed to use this to create a curve that went through the prescribed points and also creates the smooth and perfect curve that I was looking for. However, it isn’t as straight forward as it first seems.

Making an Interactive Card based UI using Swift (Part 2 / 2)

In the first part of this tutorial we set up the view controller and created a Glide class where we wrote code regarding segmentation, calculated the segmentation heights and implemented the pan gesture recognizer.

Making an Interactive Card based UI using Swift (Part 1/2)

Most apps nowadays use this card based UI to pop up information or show an action menu etc. Twitter, Instagram, Facebook all are using some sort of a multi-state, interactive, gesture based card flow to show information to users. I have always been intrigued by such a design element and thought I should try building one from scratch.

Solving Min Stack Problem using Swift

It’s been a while since I last posted an article on an algorithm and data structure problem. This time I decided to solve the Min Stack problem. In Min Stack you need to find the minimum element inside a stack in constant time.

Using @EnvironmentObject to handle Log In / Log Out condition in SwiftUI

So I started using SwiftUI this last week and thought I would write about something I have been able to make over the brief time I have used it for. While SwiftUI makes designing new applications extremely easy; I couldn’t help but notice how much Apple has simplified UI components. Sometimes a bit too much.

Getting started with FaceID/TouchID and LocalAuthentication using Swift

Since 2013, all iPhones have been launched with some sort of biometric sensors. From iPhone 5s to iPhone 8, Apple embedded a Touch ID sensor in the home button and from iPhone X onwards they started using Face ID to detect user’s face before unlocking the device.

Jony Ive Leaving Apple

I am far from a designer.  I can barely draw let alone design something. But at the same time I always appreciate a beautifully designed product. That can be a laptop, or an app. A car or some building. Design has always been something that gets to us very naturally from consumer point of you - but when you look at it from creation side of things,  then you truly need something special. That special thing has multiple roots in philosophy, culture and science.  When you look at design from a perspective of a creator, you wonder how that design  got around to its physical existence.

WWDC Guide - Traveling, lodging, Scholarship orientation & lots more! (Part 2)

WWDC2019 scholarship results were announced earlier this week and I would like to congratulate everyone who got selected 🎉. For those who were unable to get the scholarship, don’t stress out and continue working, grinding and learning. Make sure to try next year.

This is going to be part 2 of WWDC series where I will talk about the traveling, lodging, other events that are going on along side WWDC in San Jose,  and more.

As you may tell from my Instagram, I love traveling. So let’s talk about it! ✈️

Making a Tinder-esque Card Swiping interface using Swift

Tinder - we all know that dating app where you can just reject or accept someone by swiping right or left. BAM! The whole card swiping idea is now used in tons of apps. It’s a way to show data if you have grown tired of using table views and collection views. There are tons of tutorial on this and this project took me good bit of time.

You can check out the full project on my Github.

My WWDC18 Scholarship Project (Part 1)

Apple just announced WWDC 2019 and I couldn’t be more excited. WWDC is an experience of a lifetime. As an iOS developer and someone who loves software, WWDC gave me a platform to meet and interact with creative and bright developers from around the globe. I learned so many new software tips and concepts from Apple engineers; and it further motivated me to design and create apps for iPhones and iPads.

Creating Pull to Dismiss / Pull to Reach animation using Swift

One of my most used app on my iPhone is Bear app. It’s a beautiful and simple notes-taking app with tons of neat UI / UX features. One of which is being able to pull down on a scroll view to dismiss a view or select a button. As phones are getting taller, buttons on the top navigation bar are getting difficult to access using just one hand. Such gestures help users access these buttons just by swiping down or scrolling down on a scroll view which is embedded in collection view or tableviews by default.

Using UIStackView & Custom UIButton Class to add buttons to TwitterCard Interface (Part 2)

In last week’s post, we created the Twitter card interface and used UIPanGestureRecognizers to drag and dismiss the card. In this article we will take a look at how to set up buttons on the card view.

There are many ways to set up UIButtons in a vertical stack - you can simply use auto layout and individually set up constraints for each button. However, if you notice there are 8 buttons that we need to lay out and setting up constraints for each button will be a pretty tedious task.

UIStackView helps in laying out UI components. It does most of the auto layout stuff itself, so if you want the card to show buttons in both portrait and landscape orientation, the UIStackView will help you in making sure that all the buttons are perfectly visible in both orientations.

How to create Twitter card-like menu using Swift (Part 1)

Let’s create this Twitter card-like menu interface that you can invoke by tapping on the three dots on the top right hand cornerwhen you visit someone’s profile.  The initial setup is simple by creating a custom UIView which you can populate with buttons or a table view or whatever you want. I will go over that bit some day later. The main topic of discussion will be the gesture and dragging.

The code for this project is available on Github here.

Solving longest consecutive sequence in an array using Swift

This question is asked quite often in technical interview . The problem is this:

Write a function that takes in an unsorted array of integers and returns the longest range or longest consecutive sequence.

Solving 3SUM problem using Swift

The 3Sum problem is often asked during technical interviews and the problem at first seems quite tough but it’s got a pretty similar taste to 2Sum problem.

Here is the problem: You are given a sorted array, and you need to find three numbers in the array that can add up to a particular sum which is also given to you.

Interview Question: How to solve the recurrent value problem?

So I was reading an article where the person was talking about the internship interview process and in it, the person was asked 2 algorithm related questions. I decided to solve them myself and see how I would approach such a problem.

Creating a NSItemProvider for custom model class (Drag & Drop API)

For a project that I will start working on this summers, I am thinking about implementing this feature where you can drag and drop one or multiple items on a view (circleView in this tutorial) and download all those items from the web. The idea of using drag and drop is nothing new in iOS and with iOS 11, Apple has introduced a specific API for users to do just this.