Category: LinkedIn Learning / Lynda.com
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Segue Actions
If you’ve been working with View controllers for a while, you’ve probably dealt with prepareForSegue. In Xcode 11, there’s a new way to handle this that makes a little more sense: Segue actions. Let’s take a look at this feature. If you download the storyboard, you’ll find I set one up for you. It is…
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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 three string functions in BASIC: RIGHT$, LEFT$, and MID$. Let’s create…
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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 might want to be even more exclusive on what to use,…
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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 you want a RGB Value for that color? What if you…
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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. Take a look at the labels on the table. They are…
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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 try using the exercise files I’ve been using for the past…
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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 in some of those identifiers such as the HueColorTVC and ColorTableViewController.…
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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 is a pizza topping. One is a Pizza. Look at the…
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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 so you can put your sounds in the foreground. That;’s ducking,…
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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 the leading swipe configuration and one for the trailing Swipe configuration.…
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