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
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.
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…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Help support Hacking with Swift
This site is funded by Hacking with Swift supporters who buy my e-books. If you can, please support my work – it comes packed with bonus material!