文本文件中的快速转换格式（字符串分析）

Question

我想知道采用包含这种格式的行的文本文件的最佳方法是什么：姓：名：猫的数目：狗的数目：鱼的数目：其他宠物的数目

并生成一个文本文件，其中包含以下格式的行：姓氏：宠物总数

例如，将使用一个包含以下内容的文本文件：

Apple:Tim:0:0:3:0
Jobs:Steve:0:0:5:2
Da Kid:Billie:0:1:0:1
White:Walter:2:1:1:0
Bond:James:2:2:3:0
Stark:Tony:0:1:2:0
Wayne:Bruce:0:0:0:0

并输出一个看起来像这样的文本文件：

Tim Apple:3
Steve Jobs:7
Bille Da Kid:2
Walter White:4
James Bond:7
Tony Stark:3
Bruce Wayne:0

到目前为止，我一直在尝试但没有成功：

let namesFile = "Names"
let dir = try? FileManager.default.url(for: .documentDirectory,
      in: .userDomainMask, appropriateFor: nil, create: true)

// If the directory was found, we write a file to it and read it back
if let fileURL = dir?.appendingPathComponent(namesFile).appendingPathExtension("txt") {
    print (fileURL)

    var petSum = 0;
    do {
        let entriesString = try String(contentsOf: fileURL)

        let entries = entriesString.components(separatedBy: "\n")

        for entry in entries {
            let namePets = entry.components(separatedBy: ":")

            if (namePets.indices.contains(1)) {
                var sum = 0;

                print(namePets[1])
                print(namePets[0])

                for namePet in namePets {
                    if let intArg = Int(namePet) {
                        sum = sum + intArg
                    }
                }
                print (sum)
                print ("\n")
            }
        }

    } catch {
        print("Failed reading from URL, Error: " + error.localizedDescription)
    }
}
else {
    print("didn't work")
}

/*
 // Read from the file
 var inString = ""
 // Write to the file named Test
 let outString = "Write this text to the file"
 do {
     try outString.write(to: fileURL, atomically: true, encoding: .utf8)
 } catch {
     print("Failed writing to URL: \(fileURL), Error: " + error.localizedDescription)
 }

 */

非常感谢您的帮助，谢谢！

Answer 1

只需创建一个string，然后将其写入另一个文件，

do {
    let entriesString = try String(contentsOf: fileURL)
    let entries = entriesString.components(separatedBy: "\n")

    var outputString = ""

    for entry in entries {
        let namePets = entry.components(separatedBy: ":")

        if (namePets.indices.contains(1)) {
            var sum = 0
            for namePet in namePets {
                if let intArg = Int(namePet) {
                    sum = sum + intArg
                }
            }
            let line = text.isEmpty ? "" : "\n"
            outputString = outputString + line + "\(namePets[1]) \(namePets[0]):\(sum)"
        }
    }

    print(outputString)
    if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
        let newFileURL = dir.appendingPathComponent("NewNames.txt")

        try outputString.write(to: newFileURL, atomically: false, encoding: .utf8)
    }
} catch {
    print("Failed reading from URL, Error: " + error.localizedDescription)
}