Get Random String from an Array [duplicate]

问题

This question already has answers here:

Get random elements from array in Swift (5 answers)

Closed 4 years ago.

I am trying to get a random string from array "firstArray" and print it in UILabel "label". I cannot seem to figure it out and I get errors. Your help is appreciated. I tried searching but could not find any up-to-date tutorials/methods.

import UIKit

class ViewController: UIViewController {
    @IBOutlet var label: UILabel!

    @IBAction func random(_ sender: Any) {
        let firstArray = [ "hi" , "bye" , "hello"]
    }

回答1:

I'd rather using arc4random(), this code will pick up random items from your array:

let firstArray = ["hi", "bye", "hello"]
    let randomItem = Int(arc4random() % UInt32(firstArray.count))
    myLabel.text = "\(firstArray[randomItem])"

回答2:

You have to generate random numbers between 0 and your array count, then set the label text to the corresponding item in array, like this:

@IBAction func random(_ sender: UIButton) {
     let firstArray = [ "hi" , "bye" , "hello"]
     var randomNumber = Int(arc4random_uniform(UInt32(firstArray.count)))
     randLabel.text = firstArray[randomNumber]
}

this thread is helpful to understand the random logic.

来源：https://stackoverflow.com/questions/41256456/get-random-string-from-an-array