How to generate random number without repeating in Swift - ios

Question

I'm extremely new to Swift and programming in general so please be patient with me while I'm trying to get the hang of this.
I've been following a beginners course in Swift from Treehouse and managed to develop a simple app that generates random quotes. So far so good. Now before moving on to more advanced lessons I figured I'd try to update the existing app just to make sure I get some solid practice before moving on.
So here's my question: I've managed to generate a random number through the GameKit framework, but the problem is that sometimes quotes appear consecutively. How can I avoid this from happening?
Here's my code:
import GameKit
struct FactProvider {
let facts = [
"Ants stretch when they wake up in the morning.",
"Ostriches can run faster than horses.",
"Olympic gold medals are actually made mostly of silver.",
"You are born with 300 bones; by the time you are an adult you will have 206.",
"It takes about 8 minutes for light from the Sun to reach Earth.",
"Some bamboo plants can grow almost a meter in just one day.",
"The state of Florida is bigger than England.",
"Some penguins can leap 2-3 meters out of the water.",
"On average, it takes 66 days to form a new habit.",
"Mammoths still walked the Earth when the Great Pyramid was being built."
]
func randomFact() -> String {
let randomNumber = GKRandomSource.sharedRandom().nextInt(upperBound: facts.count)
return facts[randomNumber]
}
}

Answer 1

You can store last random number or last fact in a variable and check it in your randomFact function. Like this:
var lastRandomNumber = -1
func randomFact() -> String {
let randomNumber = GKRandomSource.sharedRandom().nextInt(upperBound: facts.count)
if randomNumber == lastRandomNumber {
return randomFact()
} else {
lastRandomNumber = randomNumber
return facts[randomNumber]
}
}