How to generate a random number
Swift version: 5.0
You can generate random numbers by calling the random() method on whatever numeric type you’re using, providing the range you want to work with. For example, this generates a random number in the range 1 through 5, inclusive on both sides:
let randomInt = Int.random(in: 1...5)Similar methods exist for Double, Float, and CGFloat:
let randomDouble = Double.random(in: 1...100)
let randomFloat = Float.random(in: 1..<10)
let randomCGFloat = CGFloat.random(in: 1...1000)There’s also one for booleans, generating true or false randomly:
let randomBool = Bool.random()Checking a random boolean is effectively the same as checking Int.random(in: 0...1) == 1, but it helps clarify your intent.
LEARN SWIFTUI FOR FREE I wrote a massive, free SwiftUI tutorial collection, and also have a growing list of free SwiftUI tutorials on YouTube – get started today!
Available from iOS 8.0 – see Hacking with Swift tutorial 35
Did this solution work for you? Please pass it on!
Other people are reading…
- How to count matching items in an array
- How to create a custom debug description
- How to convert a string to a double
- How to count element frequencies in an array
- What are property observers?
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
