How to create a barcode
Swift version: 5.2
You can generate a string into a traditional barcode using iOS using Core Image, but you should make sure and convert your input string to a Data using String.Encoding.ascii to ensure compatibility. Here's a function you can use that wraps it all up neatly, including scaling up the barcode so it's a bit bigger:
func generateBarcode(from string: String) -> UIImage? {
let data = string.data(using: String.Encoding.ascii)
if let filter = CIFilter(name: "CICode128BarcodeGenerator") {
filter.setValue(data, forKey: "inputMessage")
let transform = CGAffineTransform(scaleX: 3, y: 3)
if let output = filter.outputImage?.transformed(by: transform) {
return UIImage(ciImage: output)
}
}
return nil
}With that method in place, you can now write code like this:
let image = generateBarcode(from: "Hacking with Swift")
SPONSORED Announcing NSSpain 2020: Remote Edition! An online, continuous conference for iOS developers. We’ll start on Thursday and finish on Friday, with talks, activities, and lots of fun for 36 hours, non-stop. Sound good? Join us!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 8.0
Similar solutions…
- How to create live playgrounds in Xcode
- How to create a random terrain tile map using SKTileMapNode and GKPerlinNoiseSource
- SwiftUI tips and tricks
- How to modify haptic events over time using CHHapticParameterCurve
- Composing views to create a list row
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
