swift – Tarik Billa

iOS9 Swift File Creating NSFileManager.createDirectoryAtPath with NSURL

April 12, 2024 by Tarik

I figured this one out. createDirectoryAtPath() is unable to process a path with the “file://” prefix. To get a path without the prefix you must use path() or relativePath(). let documentsPath = NSURL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]) let logsPath = documentsPath.URLByAppendingPathComponent(“logs”) do { try NSFileManager.defaultManager().createDirectoryAtPath(logsPath.path!, withIntermediateDirectories: true, attributes: nil) } catch let error as NSError { … Read more

Using a MTLTexture as the environment map of a SCNScene

April 11, 2024 by Tarik

Lighting SCN Environment with an MTK texture Using Xcode 13.3.1 on macOS 12.3.1 for iOS 15.4 app. The trick is, the environment lighting requires a cube texture, not a flat image. Create 6 square images for MetalKit cube texture in Xcode Assets folder create Cube Texture Set place textures to their corresponding slots mirror images … Read more

How to get all values of an enum in swift [duplicate]

April 11, 2024 by Tarik

I don’t know if there is a method to do that. It’s a really good question, hope someone will find another way much generic that mine. Anyways, I’ve done something that do the trick: Here the enum: // SuitCount is the last one, so the total of elements (used) is SuitCount-1 enum Suit: Int { … Read more

Call to main actor-isolated instance method XXX in a synchronous nonisolated context

April 11, 2024 by Tarik

This is bug in current swift versions as compiler is not able to recognize the global actor context for a defer block, the discussion for this is going on swift forum and a PR with fix also available that should resolve this issue in future swift versions. For now, explicitly global actor context need to … Read more

Working with C strings in Swift, or: How to convert UnsafePointer to CString

April 11, 2024 by Tarik

Swift 1.1 (or perhaps earlier) has even better C string bridging: let haystack = “This is a simple string” let needle = “simple” let result = String.fromCString(strstr(haystack, needle)) The CString type is gone completely.

didSet for a @Binding var in Swift

April 10, 2024 by Tarik

Instead of didSet you can always use onReceive (iOS 13+) or onChange (iOS 14+): import Combine import SwiftUI struct ContentView: View { @State private var counter = 1 var body: some View { ChildView(counter: $counter) Button(“Increment”) { counter += 1 } } } struct ChildView: View { @Binding var counter: Int var body: some View … Read more

SwiftUI: Pop to root view when selected tab is tapped again

April 10, 2024 by Tarik

Here is possible approach. For TabView it gives the same behaviour as tapping to the another tab and back, so gives persistent look & feel. Tested & works with Xcode 11.2 / iOS 13.2 Full module code: import SwiftUI struct TestPopToRootInTab: View { @State private var selection = 0 @State private var resetNavigationID = UUID() … Read more

Swift calling static methods: type(of: self) vs explicit class name

April 10, 2024 by Tarik

There are two main differences. 1. The value of self inside the static method The metatype that you call the static method on is available to you in the method as self (it’s simply passed as an implicit parameter). Therefore if you call doIt() on type(of: self), self will be the dynamic metatype of the … Read more

Creating BaseView class in SwiftUI

April 9, 2024 by Tarik

Usually you want to either have a common behaviour or a common style. 1) To have a common behaviour: composition with generics Let’s say we need to create a BgView which is a View with a full screen image as background. We want to reuse BgView whenever we want. You can design this situation this … Read more

Local Swift Packages Stopped Working in Xcode 13

April 8, 2024 by Tarik

Quit Xcode Open Terminal Navigate to the directory where your .xcodeproj is via Terminal (cd path/to/your/apps/folder) Run xcodebuild -resolvePackageDependencies After the packages finish resolving, open Xcode and try building again.