How to randomize image pattern in Swift? Keep pattern + increase - ios

Question

New to programming and trying to make my first game. It's 4 UIImages that I want to "turn on" in a pattern as the user copies the pattern. From there is follows that same pattern and increases the random pattern. Is arc4random.uniform() what I am looking for here? I know that generates a random number but I'm stuck on how to get the random image to repeat and add +1 random to it.

Answer 1

So you have 4 images, I'm guessing you want a random number between 1 and 4 to represent the images you want to "turn on". The following can generate a random sequence of images for you (you can test this out in a Swift Playground):
import Foundation
let numberOfImages = 4
func addRandom(array: [Int]) -> [Int] {
var returnArray = array
returnArray.append(Int(arc4random()) % numberOfImages)
return returnArray
}
func makePattern(length: Int) -> [Int] {
var pattern = [Int]()
for _ in 0...(length - 1) {
pattern = addRandom(pattern)
}
return pattern
}
// Array of 3 random digits
var firstPattern = makePattern(3)
// Same array as before, with one more random digit at the end
var nextPattern = addRandom(firstPattern)
// Same array as before, with yet another random digit at the end
var lastPattern = addRandom(nextPattern)
Just for fun, you can do this even more cleanly with a Pattern class, like so:
import Foundation
class Pattern {
private(set) var maxRandomNumber: Int!
private(set) var pattern: [Int] = [Int]()
init(maxRandomNumber: Int) {
self.maxRandomNumber = maxRandomNumber
}
init(length: Int, maxRandomNumber: Int) {
self.maxRandomNumber = maxRandomNumber
for _ in 0...(length - 1) {
self.appendRandom()
}
}
func appendRandom() {
self.pattern.append(Int(arc4random()) % self.maxRandomNumber)
}
}
// Initialize a new pattern with 3 iterations and a max random number of 4
var pattern = Pattern(length: 3, maxRandomNumber: 4)
// See the pattern
print(pattern.pattern)
// Add another random number on to the end and check
pattern.appendRandom()
print(pattern.pattern)