Howto writing a file in plist mode of an array of text dictionary

(yourArray as NSArray).write(toFile: someFileName, atomically:true)

or

(yourArray as NSArray).write(to:someURL, atomically:true)

should work.

While guywithmazda’s suggestion is the most direct way to solve this problem, I strongly encourage you to rethink how you’re modelling this data. Using an array of dictionaries is not how you’d normally do this in Swift. Rather, you’d normally use a type to represent each UPS and then use a

PropertyListEncoder

to convert from that type to its serialised form (and

PropertyListDecoder

to go the other way).

Pasted in below is some code that illustrates this. Here

UPSRecord

is a struct that represents the each UPS in memory.

The advantage of this approach is type safety. Rather than manipulating arrays of dictionaries at runtime, which is very error prone, you can manipulate arrays of

UPSRecord

, which allows the type system to prevent you from making ‘obvious’ mistakes.

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—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

import Foundation

struct UPSRecord : Codable {
    var ipAddress: String
    var ipPort: Int
    var upsName: String
    var upsPort: Int

    enum CodingKeys : CodingKey, String {
        case ipAddress = "ipaddress"
        case ipPort = "ipport"
        case upsName = "upsname"
        case upsPort = "upsport"
    }
}

let upsList = [
    UPSRecord(ipAddress: "192.168.10.101", ipPort: 12345, upsName: "S 2000 (Port 1)", upsPort: 1),
    UPSRecord(ipAddress: "192.168.10.102", ipPort: 12345, upsName: "S 2000 (Port 2)", upsPort: 2),
    UPSRecord(ipAddress: "192.168.10.103", ipPort: 12345, upsName: "S 2000 (Port 3)", upsPort: 3),
]

func write(upsList: [UPSRecord], to url: URL) throws {
    let encoder = PropertyListEncoder()
    encoder.outputFormat = .xml
    let plistData = try encoder.encode([upsList])
    try plistData.write(to: url)
}