Screencasts for Professional Developers - iOS, Android and more

All Screencasts

20 Screencasts

Using Result with Network Requests

5 minutes

When working with networking code, most APIs send back optional types (usually an error and one or two other types such as a response and data), but there is no compile-time guarantee that all of these will not be nil. In today’s screencast, I will be showing you how to use Swift 5’s new Result type in our networking APIs to make them cleaner and easier to reason about.

IBInspectable and IBDesignable

5 minutes

In this screencast, you will learn how to use @IBDesignable and @IBInspectable to configure your custom views using the storyboard.

Setting Up StackViews Inside ScrollViews

4 minutes

In this screencast, we’ll show you how to set up a StackView inside a ScrollView, this will help you to create views that have to show list of related data without use table views or collection views.

Generational Analysis with the Allocations Instrument

9 minutes

Generational Analysis with the Allocations Instrument can be used to track down memory growth issues. We're going to be tracking down a memory management issue that caught us here at Big Nerd Ranch by surprise, and we'll show you what we did to solve it.

Handling Async Results

5 minutes

Throwing errors and completion handlers have pros and cons, and can’t be used in all situations. Here we examine some strategies for writing elegant async error-handling code with closures and associated-value enumerations.

Xcode Inline Documentation

10 minutes

In this screencast, you'll earn how to document your Swift code using Xcode’s Markup support, and Jazzy to create an informative API.

Using Generics in Swift

10 minutes

Generics allows for easy code reuse helping you write less code with fewer mistakes. In this video, we’ll learn how and when to use generics in your Swift apps by illustrating examples of problems that generics helps solve and we’ll build a simple, generic data structure.

Adopting Configuration Settings Files in Xcode

11 minutes

In this screencast, we will explore how to use Xcode’s Configuration Settings Files - or xcconfig files - and improve our ability to tame the complexity of managing project settings.

Unit Testing: What, Why, and How

11 minutes

Whether you’ve never written a unit test, or are just looking for a way to add unit tests to some existing troublesome code, this video will walk you through the fundamentals of unit testing on iOS with realistic example code to help you learn how to write valuable and effective tests.

Using Container Views to Manage Complex Layouts

7 minutes

When you have a complex view controller view, sometimes it is helpful to break up the view into manageable chunks. In this video we will show how you can use container views to simplify the construction of certain layouts. After this video you will know when and how to use these container views in your applications.

Creating a State Machine using Swift Enumerations

11 minutes

As View Controllers become more complex, the need to manage the state of the view becomes more important. In this video we will discuss how to use a state machine to manage our views state.

Create a Welcome Message on Initial Launch

8 minutes

Performing tasks when an application is first launched is a common practice to give users important information about the application. In this video, we will discuss one technique for implementing first launch logic, as well as how to quickly test this code.

Dispatch Groups

4 minutes

We demonstrate using Dispatch Groups to rendezvous multiple simultaneous asynchronous tasks so that you can process all of their results at once, after the last one finishes.

Optional Return Values vs. Throwing

8 minutes

This video Illustrates the differences between using optional return values or throwing errors for functions that can fail. The implementations are discussed and the pros and cons of each approach are discussed.

Dynamic Stack Views

9 minutes

UIStackViews are a relatively new addition to UIKit, appearing with iOS 9. They are quite useful because they eliminate the need for many Auto Layout constraints in common screen designs, making them easier to modify and maintain.

Finding and Fixing Memory Issues

7 minutes

Incorrectly managing memory in our applications can result in hard to find bugs and possible crashes. In this video, we will explore the Memory Graph debugging tool in Xcode and how you can use it to find and fix strong reference cycles in closures.

Keyboard Avoidance

9 minutes

Trouble getting layouts to fit the keyboard? In this screencast, we'll show you how to handle your layouts changing due to the keyboard. After this series, you will have several different tools for avoiding the keyboard.

Asynchronous UI testing

7 minutes

Xcode UI tests are asynchronous in that they simulate end user interaction with your application. In this screencast, learn how to write tests that exercise your app at the user interface level, handling asynchronous behaviors that take varying amounts of time.

Creating an App Widget

10 minutes

Mobile devices are all about convenience. Users want to get the information they need from your app quickly and easily. Apple has added the Today view with widgets for just this reason. Widgets provide app users with a way of quickly accessing important features and content of your apps without having to open each app one by one. In this screencast, we'll go over how to create a widget for your app.

Xcode Configurations vs. Schemes

10 minutes

Targets and configurations and schemes; Oh my! Confused by these Xcode concepts? Curious how using multiple build configurations coupled with schemes can avoid the multiple-target mess? If you’re wondering what this all means and how it can make your developer life better, this video is for you.