小编ric*_*brz的帖子

我正在研究一个随机密码生成器,我希望有一个用户可以输入的基本字符串,并在基本字符串内部或周围生成随机字符.我的问题是,只要它用基本字符串生成随机字符,它们就会插入前面(第0个索引).这是我的代码:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var baseStringTextField: UITextField!
    @IBOutlet weak var lowerCaseSwitch: UISwitch!
    @IBOutlet weak var upperCaseSwitch: UISwitch!
    @IBOutlet weak var numberSwitch: UISwitch!
    @IBOutlet weak var numberOfCharactersSlider: UISlider!
    @IBOutlet weak var numberOfCharsLabel: UILabel!

    let lower = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t","u","v","w", "x", "y", "z"]
    let upper = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]
    let numbers = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"] …