我有一些非常困惑的代码——至少我是这么认为的!我想问问你们，是否有更简单的方法来做到这一点，这样这部分代码就不会占用那么多空间。
这是我的代码能够做到的:
使用 components(separatedBy: "") 将一个字符串变成一个数组。它需要这样做，因为 allCars 实际上是一个正在上线的值。
检查最后一个值以获取车辆的类别。检查有多少个汽车类别，摩托车类别等。
检查车辆的重量(通过查看countingVehicleOne、countingVehicleTwo ...等中特定车辆的数组)
计算每辆车的平均值。
我应该说有时不会有汽车..有时不会有摩托车 - 这非常重要。
代码如下:
let allCars = "Peugeot#950#yellow#car--Yamaha#180#black#motorcycle--Kawazasaki#210#green#motorcycle"
let countingCategories = allCars.components(separatedBy: "--")
var carWeight: Int = 0
var motorcycleWeight: Int = 0
var carCount: Int = 0
var motorcycleCount: Int = 0
if countingCategories.count == 1 {
let countingVehicleOne = countingCategories[0].components(separatedBy: "#")
if countingVehicleOne[3] == "car" {
carWeight = Int(countingVehicleOne[1])!
var carCount: Int = 1
} else if countingVehicleOne[3] == "motorcycle" {
motorcycleWeight = Int(countingVehicleOne[1])!
var motorcycleCount: Int = 1
}
} else if countingCategories.count == 2 {
let countingVehicleOne = countingCategories[0].components(separatedBy: "#")
let countingVehicleTwo = countingCategories[1].components(separatedBy: "#")
let numbers:[[String]] = [countingVehicleOne, countingVehicleTwo]
for number in numbers {
if number.last == "car"{
carCount = carCount + 1
}
}
for number in numbers {
if number.last == "motorcycle"{
motorcycleCount = motorcycleCount + 1
}
}
if countingVehicleOne[3] == "car" {
carWeight = Int(countingVehicleOne[1])!
} else if countingVehicleOne[3] == "motorcycle" {
motorcycleWeight = Int(countingVehicleOne[1])!
}
if countingVehicleTwo[3] == "car" {
carWeight = Int(countingVehicleTwo[1])! + carWeight
} else if countingVehicleTwo[3] == "motorcycle" {
motorcycleWeight = Int(countingVehicleTwo[1])! + motorcycleWeight
}
} else if countingCategories.count == 3 {
let countingVehicleOne = countingCategories[0].components(separatedBy: "#")
let countingVehicleTwo = countingCategories[1].components(separatedBy: "#")
let countingVehicleThree = countingCategories[2].components(separatedBy: "#")
let numbers:[[String]] = [countingVehicleOne, countingVehicleTwo, countingVehicleThree]
for number in numbers {
if number.last == "car"{
carCount = carCount + 1
}
}
for number in numbers {
if number.last == "motorcycle"{
motorcycleCount = motorcycleCount + 1
}
}
if countingVehicleOne[3] == "car" {
carWeight = Int(countingVehicleOne[1])!
} else if countingVehicleOne[3] == "motorcycle" {
motorcycleWeight = Int(countingVehicleOne[1])!
}
if countingVehicleTwo[3] == "car" {
carWeight = Int(countingVehicleTwo[1])! + carWeight
} else if countingVehicleTwo[3] == "motorcycle" {
motorcycleWeight = Int(countingVehicleTwo[1])! + motorcycleWeight
}
if countingVehicleTwo[3] == "car" {
carWeight = Int(countingVehicleThree[1])! + carWeight
} else if countingVehicleTwo[3] == "motorcycle" {
motorcycleWeight = Int(countingVehicleThree[1])! + motorcycleWeight
}
}
let averageCarWeight = carWeight / carCount
let averageMotorcycleWeight = motorcycleWeight / motorcycleCount
print("Average weight for cars: \(averageCarWeight), average weight for motorcycle: \(averageMotorcycleWeight)")
我不确定它是否可以用更简单的方式完成，但我想与你们确认是否有 :-) 感谢您抽出时间!
编辑
最佳答案
您好，您实际上可以使用高阶函数来实现您的需求。
let allVehicles = "Peugeot#950#yellow#car--Yamaha#180#black#motorcycle--Kawazasaki#210#green#motorcycle"
let vehichlesArray = allVehicles.componentsSeparatedByString("--")
let vehicles = vehichlesArray.map { $0.componentsSeparatedByString("#") }
let cars = vehicles.filter { $0[3] == "car" }
let motorcycles = vehicles.filter { $0[3] == "motorcycle" }
let carsCount = cars.count
let motorcyclesCount = motorcycles.count
let carWgt = cars.reduce(0, combine: { $0 + (Int($1[1]) ?? 0) })
let motorcycleWgt = motorcycles.reduce(0, combine: { $0 + (Int($1[1]) ?? 0) })
不过，我相信面向对象的架构更适合这种场景。
关于ios - 检查多个数组的特定值并计算另一个值的平均值 - swift，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39891874/