ios - 创建随机数的类实例 - Swift

Question

我正在尝试使用随机数量的练习生成随机“锻炼”。

每个练习都需要有一个名称(来自一个数组)和一个重复次数(一个随机数，最终将根据它是什么类型的练习有“上限和下限”(例如俯卧撑最多 10 次) ，但只有 1 个用于“500m 行”。但这可以稍后出现!现在，我正在尝试生成随机数量的类实例(然后我将通过 segue 传递这些实例并放入 tableView ，假设这是可能的)

这是我的代码，目前只是在 Playground 上:

import UIKit

let exerciseArray = ["squats", "pushups", "lunges", "jumping jacks"]

class exerciseInWorkout {

    var exerciseName : String
    var exerciseReps : Int

    init(name: String, reps: Int) {
        exerciseName = name
        exerciseReps = reps
    }

}

let randomkey = Int(arc4random_uniform(4))
let numberOfExercisesInWorkout = Int(arc4random_uniform(10))

// Manually creating a new object of exerciseInWorkout with a random exercise and a random number of reps

let exerciseOne = exerciseInWorkout(name:exerciseArray[randomkey],     reps:Int(arc4random_uniform((30))))

//print result to make sure it works

print(exerciseOne.exerciseName, exerciseOne.exerciseReps)

//Have some function here which creates a number of class instances based on the "numberOfExercisesInWorkout" constant

如果我完全走错了路，请随时告诉我，但我认为我离得不远(希望...)

Answer 1

对此可能有很多不同的(有效的)方法。其中之一可能是这样的:

let exerciseArray = ["squats", "pushups", "lunges", "jumping jacks"]

struct Exercise {
    let name: String
    let reps: Int
}

func randomInt(upperBound: UInt32) -> Int {
    return Int(arc4random_uniform(upperBound))
}

let numberOfExercisesInWorkout = randomInt(upperBound: 10)

let exercises: [Exercise] = (1...numberOfExercisesInWorkout).map { _ in
    let randomKey = randomInt(upperBound: UInt32(exerciseArray.count))
    return Exercise(name: exerciseArray[randomKey], reps: randomInt(upperBound: 10))
}

print(exercises)

---

输出是这样的:

[Exercise(name: "lunges", reps: 8), Exercise(name: "jumping jacks", reps: 6), Exercise(name: "lunges", reps: 4), Exercise(name: "squats", reps: 9), Exercise(name: "jumping jacks", reps: 5), Exercise(name: "squats", reps: 9)]

---

注意:您还可以修改 (randomInt) 辅助函数以考虑我猜的 lowerBound