Make App Pie
Training and Instructional Design
Tag: ios
Checkboxes in SwiftUI
There’s lots of good stuff in SwiftUI. One missing control is old fashioned checkbox like I have on the web or on my Mac. There is a way to make a checkbox with a Toggle control. However, as a bit of a intro to…
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…
Strings in Swift: Going back to BASICs
A few tips ago, we went under the hood with unicode Characters and their relationship to the Swift String type. For most, that’s great theory, but how does it apply to strings, not characters? When I started programming back in the 1980’s, I had…
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…
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 ARC
One of those difficult things for even experienced developers to understand is Automatic Reference Counting, or ARC. It is how Swift manages and conserves memory automatically. Take a look at the Exercise file. I have a playground in this project with two classes. One…
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…
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