I’m struggling to get an app working on Catalina 10.15.2 using Xcode 11.3.1, Swift 5. I could manage to boil down an example of the crash for Xcode Playgrounds:   import Cocoa import simd var viewMatrix = double4x4(1) var modelMatrix = double4x4(1) let modelViewMatrix =…

Me and my acquaintances are currently in the process of making a map app using Xcode and swift. However, we are struggling on how to read a text file line by line to get coordinates. We also are struggling on how to zoom into graphic…

Hello:   I am getting the following error:   Illegal NSTableView data source:  Must implement numberOfRowsInTableView: and tableView:objectValueForTableColumn:row:   My tableView implementation is as follows:   import Cocoa import CoreData class RegistrationReportsViewController: NSViewController {        override func viewDidLoad() {         super.viewDidLoad()         showRegisteredStudents()        …

Hello,   This is a beginner question but it has me stumped. I have a JSON file in the bundle that includes valid UUIDs generated from within Xcode in the format “D9BB6CD0-FBB9-49B9-9076-07D49E1707B2”. I want to store these in a UUID variable within a struct.  …