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Training and Instructional Design
Category: Tutorial
Use Sets in Swift
Of the most underrated collection types is sets. Sets are an unordered collection with unique values. Let’s take a look at what you can do with sets. Download the exercise files and you’ll find I created playground with a Struct called Pizza. I’ve made…
Launch an Alert from a Closure Safely
Your app can get into problems when you launch UI from others threads, such as closures. For example, you might have an app that going to ask for permissions for things like photos, notifications, or location data. The system usually handles those, but you…
Change UIColors to RGB and HSB colors
One dilemma you’ll find when working with colors is switching between color systems. There’s two you’ll most often be using: the Red-Green-Blue or RGB and Hue-Saturation-Brightness or HSB. Download the Exercise file and run. It will give you the HSB value, but what if…
Use Dynamic Type
For reading ease and visual accessibility you should be using dynamic fonts whenever possible. Let’s look at an example you can get from the download files. I’ve run the Split View Controller from a previous tip in landscape on an iPad Pro 9.7 inch….
Programmatically Add Split View Controllers
An often ignored but rather powerful View Controller is the UISplitViewController. You can make one from a template and the storyboard, but I often skip both and do it programmatically, which is especially good when I’m prototyping in a playground. Let’s give it a…
Refactoring
One of the core elements of clean code is having code that is consistent with identifiers. Head to the AppDelegate. Take a look at this code from the tip from last week. I have a few problems with it. I’m not being very consistent…
Understand Closures
You’ll find closures throughout the API’s, but you may not know how to use them properly. Let’s take a basic tour of closures. Download the exercise file, and you’ll find a project with a playground. In the playground you’ll find a function to compute…
Ducking Sound in AVAudioSession
Ducking has nothing to do with waterfowl. Sometimes you’ll want to add sound to your app, but the user will be using the music or others app along with your app. For that, you’ll want to slightly lower the volume of the background music…
Actions in Table Views
Sometimes table views could use a few buttons. There’s two delegates which create swipe buttons on table view cells. Let’s learn how you can implement these buttons and an interesting hidden feature you can do with them. There is two delegate methods, one for…
Thrown Errors
There’s many ways to handle errors in Swift. For some errors, using throws is a great way to handle errors without crashing the system. Download the exercise file. You’ll find a project with an embedded playground. While there’s a lot better ways to do…
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