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iOS

A collection of 88 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

iOS

Drag and Drop on iOS using Swift

Hello folks, it's been a while since I wrote my last article. Today we're going to learn how to implement drag and drop feature on iOS using Swift. To see in advance what we're going to achieve by the end of this tutorial, please watch the following video, To summarize

Swift

Using Codable Protocol in Swift 4.1

Swift 4 Codable protocol to decode and encode json data and model objects. Explained with examples.

UITableView

Add headers and footers to tableview sections

In the previous post, we saw how to add header and footer views to entire table view. In this post, we will see how to add header and footers to individual UITableView sectionsBefore we get started, make sure (Either programmatically or through storyboard) to add UITableView instance to your main

yyyy

Challenges of DateFormatters

Working with DateFormatters is tough - At least on iOS. Today I will show with an example how I shot myself in the foot while working with simple DateFormatters problem. Here's the problem statement: I had an UI where user would choose month and year through a simple picker and

iOS

Making user friendly mobile apps

We all love using apps, don't we? They are great utility and ubiquitous after the propagation of smartphones all around us. However, as I do and I am sure lots of other people would be experiencing glitches that could lead to bad user experience. In this post, I will list

iOS

How to get the iOS App Metadata in Swift

Working on a new app could be exciting. However, there are certain things or information which you might want to get as a part of the core feature. One of them is the app metadata. This may contain numerous values - Some of them essential some - not so useful.

Swift

When to weakify

Today I am going to talk about one of the discussion prone topics on iOS platforms. Detecting memory leaks and when to apply weakify. The topic came up while I was recently performing a code review and there were some discussions on whether there is a memory leak or not.

Swift

Swift - Fighting memory leaks in closures

Swift is a great language. In fact, it's among my top 3 favorite languages. It is quite strict in terms of discipline and best practices which pay off in the long-term to offer performance and crash-free experience to end-users. There are also many ways where things can go wrong. Today

Regular Expressions

Regular Expressions in Swift and iOS

I didn't actually plan on writing this post. However, things didn't go as I expected them to go. Today I was helping someone with Regular Expression which I thought was my forte and it still failed me. The regular expression exercise which I was arrogant about finishing in 10 minutes

Swift

Closure Trick in Swift

Today I learned a closure trick in Swift. Usually when expression is assigned to a variable on left, it is evaluated instantly. For example, let value = complexCalculation() func complexCalculation() -> String { return "Something useful" } In this example, when value is assigned a result of complexCalculation() method, it

iOS

Swift 4 - Multiline string literals support

Multi-line support in Swift 4. Now add multi line support with double quotes using Swift 4 and Xcode 9. Tutorial with example on adding support.

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

Writing an app with VIPER architecture - Part 2

I have written a part 1 of writing an iOS app using VIPER architecture. This covers fundamentals and basic example of using VIPER, creating models, entities and utilizing them in the app. This is the second and final part in the series. This will be very much similar to the

iOS

Writing an app with VIPER architecture - Part 1

Last week I came across one of the many awesome frameworks on iOS. Having recently worked with MVVM and MVC, I was bit hesitant to learn VIPER, since more frameworks you learn, there is good chance you will forget the previous ones. However, I tried to keep my previous teaching

MVVM

Comparing VIPER vs. MVVM

Recently I started playing with VIPER architecture. Although I was quite hesitant trying it out, it turns out it's not all that bad as I expected. It'e certainly better than traditional MVC iOS architecture in terms of testability and separation of concerns. However, I found it consistently annoying to have

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

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

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

iOS

iOS - Communication from Javascript to iOS

This is the second part of two series article. You have already read the first part which shows how to transfer data from iOS to JavaScript. In this part we will see how you can transfer data from JavaScript function back to iOS (Swift). For the clarity purpose and to

JavaScript

iOS - Communication from iOS to JavaScript

This is the first part of a series about communication between iOS and JavaScript. In this part we will see How to call JavaScript functions from iOS How to get return value of executed JavaScript functions back to iOS How to pass variety of objects types (String, object) to JavaScript

iOS

Lessons learned from 3D touch demo

This weekend I spent significant amount of time working on the previously inactive 3D touch demo project. I added few tweaks, made little experiments and removed extraneous code from the repository. Below are some of the findings and gotchas I learned from touching this project after long time. Detecting device

iOS

Custom Operators in Swift with Generics

Swift introduced us a new era of custom operators. Unlike Objective-C, it will allow us to define our own operators and perform operator overloading if necessary. Although I haven't come across such use case, custom operators can provide excellent clarity and flexibility down the line. Let's start with how you

iOS

Making a crater in UIView with CALayer

Although title sounds horrible, believe me - It's not that bad. This is a trick I learned from StackOverflow post. Although seemingly innocuous, it took me a while to figure out given the view, how to puncture any shape into it. To make it more interesting let's not only add