Use array as string and remove double quotes symbol to change array content type from string to any,-CodePudding

I been stuck at this for far too long. I have to send this array as string: "[{\"packageId\":\"1\"}, {\"packageId\":\"1\"}, {\"packageId\":\"3\"}]" and so on. The values here are being inserted and can be any integer. As I cannot declare any variable in format like let pjson = {\"packageId\":\"1\"} so I decided to create a string instead in this way: let pjson = "{\"packageId\":\"1\"}" and using for loop im adding data in some array in following way:

for package in packages {
       if let pId = package.packageId {
            let pjson = "{\"packageId\":\"\(pId)\"}"
             packageJson.append(pjson as Any)
        }
 }

After this im getting an array like this:

packageJson = ["{\"packageId\":\"1\"}", "{\"packageId\":\"2\"}", "{\"packageId\":\"3\"}", "{\"packageId\":\"4\"}", "{\"packageId\":\"5\"}", "{\"packageId\":\"6\"}"]

Now I want to convert my packageJson to this format:

packageJson = [{\"packageId\":\"1\"}, {\"packageId\":\"2\"}, {\"packageId\":\"3\"}, {\"packageId\":\"4\"}, {\"packageId\":\"5\"}, {\"packageId\":\"6\"}]

As you can see, I don't want array content to be a string type.

So I stored whole array as string and decided to remove those " like this:

var stringJson = "\(packageJson)"
stringJson = stringJson.replacingOccurrences(of: "\\{", with: "{", options: NSString.CompareOptions.literal, range: nil)
stringJson = stringJson.replacingOccurrences(of: "}\\", with: "}", options: NSString.CompareOptions.literal, range: nil)

I tried to ""{" but got error so using "\\{" as I read somewhere it can be used for " however that answer wasn't market correct so not sure.

How can I remove those " to convert array into my required format? Or is there any better way to declare let pjson = "{\"packageId\":\"\(pId)\"}" so I can simply add that without having to use string format? Swift doesn't allow to start a variable with "{" tho.

Anyway I would just like to get final result in this way:

stringJson = "[{\"packageId\":\"1\"}, {\"packageId\":\"2\"}, {\"packageId\":\"3\"}, {\"packageId\":\"4\"}, {\"packageId\":\"5\"}, {\"packageId\":\"6\"}]"

CodePudding user response：

Your final result is a JSON string of an array of custom objects. There is a way more simpler way to achieve what you want.

First create a struct to hold your values:

struct PackageContainer: Codable{
    var packageId: String
}

Then create you data as you deem fit. Example:

let packages = (0...10).map{ PackageContainer(packageId: "\($0)") }

Then encode them with JSONEncoder:

let json = try JSONEncoder().encode(packages)

This will give you a Data object. You can treat it as string if you like or send it in the body of a datarequest.

Example:

print(String(data: json, encoding: .utf8)!)

will produce:

[{"packageId":"0"},{"packageId":"1"},{"packageId":"2"},{"packageId":"3"},{"packageId":"4"},{"packageId":"5"},{"packageId":"6"},{"packageId":"7"},{"packageId":"8"},{"packageId":"9"},{"packageId":"10"}]

CodePudding user response：

In Swift 5.0

let ids = [1, 2]

let idsString = ids.map { id -> String in
    return "{\"packageId\""   ":"   "\"\(id)\"}"
}.joined(separator: ",")

let result = "["   idsString   "]"
print(result)

you will get the results:

[{"packageId":"1"},{"packageId":"2"}]