You’ve been working on your billion dollar app
IBOutlet and IBAction connections look like they’ve been disconnected (see image below):
Continue reading “Fix for IBOutlet, IBAction connections disappearing in Xcode 9”
Category: IBAction
Xcode tidbits: Open as Hex, Open As Source Code, (Git) line endings, and text encoding
With this article, I’m starting a series about all the goodies — useful tools — that can be found in Xcode. Some of these tidbits are tools everyone knows about while others are barely documented to undocumented. For example, how many of you know that you can view, inspect, and debug all your Auto Layout constraints live during app execution using the “Debug View Hierarchy” Xcode feature? I discussed that feature in detail in this article, “Troubleshooting Auto Layout using Xcode’s Debug View Hierarchy.” Today, we’ll discover two editors that ship with Xcode, the “Open As > Hex” and “Open As > Source Code” editors, both only available by right-clicking on files in the “Project Navigator” to reveal a contextual menu.
Polymorphism in Swift 3: manipulate multiple related controls with one IBOutlet and one IBAction
- [Download Xcode 8.2.1 project with full Swift 3 source from GitHub.]
- [Download Xcode 8.2.1 playground with full Swift 3 source from GitHub.]
How would you enable or disable multiple user interface controls using one IBOutlet and one IBAction? For example, you might need to disable a UITextBox and UISegmentedControl because a user’s login has expired. Perhaps a user hasn’t filled in some required fields on a form, so you want to disable several buttons. Watch the following video to see how I built a Swift 3 app to use a UISwitch to enable or disable four controls all at one time — and I demonstrated the object-oriented programming (OOP) principle of polymorphism:
Refresh your memory about OOP and inheritance.
Swift 3 segues, unwind segues, storyboards, and view/navigation controllers
[Download Xcode 8.2.1 project with full Swift 3 source from GitHub.]
Today’s tutorial covers transitions — segues — from one source storyboard scene to another destination scene, and unwind segues leading back from destination to source… I created a project to help you follow along with this tutorial, written in Swift 3, against the iOS 10 SDK, and using the Xcode 8.2.1 IDE. Please download the project. The app produced by the project is shown in action in the following video. Please watch before continuing on:
Segues don’t exist in a vacuum. I’ve introduced a UINavigationController into the mix. Of course, you’ll see a few UIViewControllers. I’ve also used a UITableView and managed its complexity by breaking it into logical pieces by using Swift “extensions.” As you proceed, you’ll have to grasp concepts like Auto Layout and managing a table view’s data source.
Continue reading “Swift 3 segues, unwind segues, storyboards, and view/navigation controllers”