Mobile

A property wrapper is a generic structure that encapsulates read and write access to the property and adds additional behavior to it. We use it if we need to constrain the available property values, add extra logic to the read/write access (like using databases or user defaults), or add some additional methods.

In this article, Toptal Freelance iOS Developer Alexander Gaidukov demonstrates Swift 5.1’s new @propertyWrapper annotation—a more elegant solution.

The quietly growing number of serious Haxe projects have something new to contend with: the first major compiler release in over three years. What does Haxe 4 bring to the table?

While Redux is a great state management solution, it doesn’t support asynchronous behavior by default. A way around this is to use redux-observable, based on RxJS - a powerful library for reactive programming in JavaScript.

In an age of continuous delivery, Java developers have to be confident that their changes don’t break existing code, hence automated testing. There’s more than one valid approach to it, but how can you keep them straight?

Subscription-based apps need a special approach when it comes to analytics. Learn how a variation on the traditional sales funnel helps you work with LTV, subscriber retention, and churn rates to make your app better—and more profitable.

In an era of cross-platform mobile development, it is crucial to understand the specifics of different operating systems and hardware.

In this article, Mobile Developer Martin Doychev lists a number of bad practices employed while creating apps for iOS and Android and explains what you should and shouldn’t do.

Apple’s iOS SDK features a bevy of built-in UI components, but what happens when you decide you need a bit more? What if you need to create a swipeable UITabBar?

In this post, Toptal iOS Developer George Vashakidze explains how he tried using a third-party library, and why he chose to create his own solution instead.

Building a mobile app isn’t cheap—and the harsh reality is that most apps fail. Find out how to leverage fundamental analytics metrics to make sure your app actually turns a profit.

T9 predictive text has been around for ages, and it lost relevance with the advent of modern smartphones. However, T9 can still be a useful addition to certain types of apps on iOS.

In this article, Toptal Swift Developer George Vashakidze explains why T9 can still be useful and practical, and how you can add it to your next iOS app.

Cross-platform mobile apps are increasingly being built with React Native. But how can you scan for QR codes and augment the user’s camera view when they’re present?

Google’s Flutter mobile SDK only recently made it to version 1.0, but it is already catching up with React Native in terms of market share. Flutter is also used to develop apps for Google’s upcoming Fuchsia OS.

In this article, Toptal Java Developer Nemanja Stosic demonstrates how to create a simple messaging app using Flutter and Firebase.

Eliminate complex code configurations using a monorepo structure. This guide will help you get started.

Keeping your Android codebase maintainable as your codebase grows can be a challenge. In this article, Toptal Freelance Android Developer Abhishek Tyagi shows how to combine MVVM with Clean Architecture—the latter as described by Robert C. Martin—to write decoupled, testable, and maintainable code.

iOS developers love the power of UIKit, and animating a UIView is usually fairly easy. However, if you want to chain animations together and set up dependencies between them, your code can quickly become difficult to read with many nested closures and indentation levels.

In this article, I’ll explore how to apply the power of a reactive framework such as RxSwift to make that code look much cleaner as well as easier to read and follow. My client wanted a story told through a sequence of animations rather than by playing a pre-rendered video, and with RxSwift, we easily tweaked it to perfection.

Code reuse turns lazy developers into efficient geniuses. Imagine if you could write the majority of your code once and run it on the web and native mobile—both iOS and Android.

In this article, Toptal Freelance Dart Developer Marko Perutović introduces us to the BLoC pattern, whereby you can isolate your business logic in pure Dart and reuse it in both Flutter and AngularDart.

Real-time data-driven apps create new challenges in the way we structure our programs, especially on mobile. In this article, Toptal Freelance iOS Developer Lucas van Dongen implements an iOS chat app, comparing the classic MVC approach with a static immutable MVVM pattern.