swift - 数组错误

Question

我正在尝试从 .txt 文件读取记录并将它们存储为结构集合，但我正在努力修复此错误:

"Missing argument for parameter 'year' in call

这是我的代码:

struct DataSet: CustomStringConvertible {

var year: Int
var month: Int
var tmax: Double
var tmin: Double
var airfrost: Int
var rain: Double
var sun: Double

var description: String {

    return "\(year) + \(month) + \(tmax) + \(tmin) + \(airfrost) + \(rain) +  \(sun)"

}
}


let path = "/Users/sc16hsm/Desktop/CW2/data/bradford.txt"

 var data = [DataSet]()
var temp = DataSet()

if let contents = try? String(contentsOfFile: path) {

let filtered = contents.components(separatedBy: "\n")

for line in filtered {
    let x = line.components(separatedBy: " ").filter{$0 != ""}

    let x = line.components(separatedBy: " ")

    temp.year = Int(x[0])
    temp.month = Int(x[1])
    temp.tmax = Double(x[2])
    temp.tmin = Double(x[3])
    temp.airfront = Int(x[4])
    temp.rain = Double(x[5])
    temp.sun = Double(x[6])
    data.append(temp)
    print(x)
}

任何帮助将不胜感激。

Answer 1

如果结构体的成员没有初始值，则必须使用成员初始化器。默认初始化程序不起作用。

你必须在循环内编写

   let temp = DataSet(year: Int(x[0])!,
                       month:  Int(x[1])!,
                       tmax:  Double(x[2])!,
                       tmin: Double(x[3])!,
                       airfrost: Int(x[4])!,
                       rain: Double(x[5])!,
                       sun: Double(x[6])!)
    data.append(temp)

请使用代码完成来获取完整的语法。