With Swift 4's Codable protocol there's a great level of under the hood date and data conversion strategies.
Given the JSON:
{
"name": "Bob",
"age": 25,
"tax_rate": "4.25"
}
I want to coerce it into the following structure
struct ExampleJson: Decodable {
var name: String
var age: Int
var taxRate: Float
enum CodingKeys: String, CodingKey {
case name, age
case taxRate = "tax_rate"
}
}
The Date Decoding Strategy can convert a String based date into a Date.
Is there something that does that with a String based Float
Otherwise I've been stuck with using CodingKey to bring in a String and use a computing get:
enum CodingKeys: String, CodingKey {
case name, age
case sTaxRate = "tax_rate"
}
var sTaxRate: String
var taxRate: Float { return Float(sTaxRate) ?? 0.0 }
This sort of strands me doing more maintenance than it seems should be needed.
Is this the simplest manner or is there something similar to DateDecodingStrategy for other type conversions?
Update: I should note: I've also gone the route of overriding
init(from decoder:Decoder)
But that is in the opposite direction as it forces me to do it all for myself.
Unfortunately, I don't believe such an option exists in the current JSONDecoder API. There only exists an option in order to convert exceptional floating-point values to and from a string representation.
Another possible solution to decoding manually is to define a Codable wrapper type for any LosslessStringConvertible that can encode to and decode from its String representation:
struct StringCodableMap<Decoded : LosslessStringConvertible> : Codable {
var decoded: Decoded
init(_ decoded: Decoded) {
self.decoded = decoded
}
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
let decodedString = try container.decode(String.self)
guard let decoded = Decoded(decodedString) else {
throw DecodingError.dataCorruptedError(
in: container, debugDescription: """
The string \(decodedString) is not representable as a \(Decoded.self)
"""
)
}
self.decoded = decoded
}
func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encode(decoded.description)
}
}
Then you can just have a property of this type and use the auto-generated Codable conformance:
struct Example : Codable {
var name: String
var age: Int
var taxRate: StringCodableMap<Float>
private enum CodingKeys: String, CodingKey {
case name, age
case taxRate = "tax_rate"
}
}
Although unfortunately, now you have to talk in terms of taxRate.decoded in order to interact with the Float value.
However you could always define a simple forwarding computed property in order to alleviate this:
struct Example : Codable {
var name: String
var age: Int
private var _taxRate: StringCodableMap<Float>
var taxRate: Float {
get { return _taxRate.decoded }
set { _taxRate.decoded = newValue }
}
private enum CodingKeys: String, CodingKey {
case name, age
case _taxRate = "tax_rate"
}
}
Although this still isn't as a slick as it really should be – hopefully a later version of the JSONDecoder API will include more custom decoding options, or else have the ability to express type conversions within the Codable API itself.
However one advantage of creating the wrapper type is that it can also be used in order to make manual decoding and encoding simpler. For example, with manual decoding:
struct Example : Decodable {
var name: String
var age: Int
var taxRate: Float
private enum CodingKeys: String, CodingKey {
case name, age
case taxRate = "tax_rate"
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
self.name = try container.decode(String.self, forKey: .name)
self.age = try container.decode(Int.self, forKey: .age)
self.taxRate = try container.decode(StringCodableMap<Float>.self,
forKey: .taxRate).decoded
}
}
You can always decode manually. So, given:
{
"name": "Bob",
"age": 25,
"tax_rate": "4.25"
}
You can do:
struct Example: Codable {
let name: String
let age: Int
let taxRate: Float
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
name = try values.decode(String.self, forKey: .name)
age = try values.decode(Int.self, forKey: .age)
guard let rate = try Float(values.decode(String.self, forKey: .taxRate)) else {
throw DecodingError.dataCorrupted(.init(codingPath: [CodingKeys.taxRate], debugDescription: "Expecting string representation of Float"))
}
taxRate = rate
}
enum CodingKeys: String, CodingKey {
case name, age
case taxRate = "tax_rate"
}
}
See Encode and Decode Manually in Encoding and Decoding Custom Types.
But I agree, that it seems like there should be a more elegant string conversion process equivalent to DateDecodingStrategy given how many JSON sources out there incorrectly return numeric values as strings.
According to your needs, you may choose one of the two following ways in order to solve your problem.
#1. Using Decodable init(from:) initializer
Use this strategy when you need to convert from String to Float for a single struct, enum or class.
import Foundation
struct ExampleJson: Decodable {
var name: String
var age: Int
var taxRate: Float
enum CodingKeys: String, CodingKey {
case name, age, taxRate = "tax_rate"
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
name = try container.decode(String.self, forKey: CodingKeys.name)
age = try container.decode(Int.self, forKey: CodingKeys.age)
let taxRateString = try container.decode(String.self, forKey: CodingKeys.taxRate)
guard let taxRateFloat = Float(taxRateString) else {
let context = DecodingError.Context(codingPath: container.codingPath + [CodingKeys.taxRate], debugDescription: "Could not parse json key to a Float object")
throw DecodingError.dataCorrupted(context)
}
taxRate = taxRateFloat
}
}
Usage:
import Foundation
let jsonString = """
{
"name": "Bob",
"age": 25,
"tax_rate": "4.25"
}
"""
let data = jsonString.data(using: String.Encoding.utf8)!
let decoder = JSONDecoder()
let exampleJson = try! decoder.decode(ExampleJson.self, from: data)
dump(exampleJson)
/*
prints:
▿ __lldb_expr_126.ExampleJson
- name: "Bob"
- age: 25
- taxRate: 4.25
*/
#2. Using an intermediate model
Use this strategy when you have many nested keys in your JSON or when you need to convert many keys (e.g. from String to Float) from your JSON.
import Foundation
fileprivate struct PrivateExampleJson: Decodable {
var name: String
var age: Int
var taxRate: String
enum CodingKeys: String, CodingKey {
case name, age, taxRate = "tax_rate"
}
}
struct ExampleJson: Decodable {
var name: String
var age: Int
var taxRate: Float
init(from decoder: Decoder) throws {
let privateExampleJson = try PrivateExampleJson(from: decoder)
name = privateExampleJson.name
age = privateExampleJson.age
guard let convertedTaxRate = Float(privateExampleJson.taxRate) else {
let context = DecodingError.Context(codingPath: [], debugDescription: "Could not parse json key to a Float object")
throw DecodingError.dataCorrupted(context)
}
taxRate = convertedTaxRate
}
}
Usage:
import Foundation
let jsonString = """
{
"name": "Bob",
"age": 25,
"tax_rate": "4.25"
}
"""
let data = jsonString.data(using: String.Encoding.utf8)!
let decoder = JSONDecoder()
let exampleJson = try! decoder.decode(ExampleJson.self, from: data)
dump(exampleJson)
/*
prints:
▿ __lldb_expr_126.ExampleJson
- name: "Bob"
- age: 25
- taxRate: 4.25
*/
You can use lazy var to convert the property to another type:
struct ExampleJson: Decodable {
var name: String
var age: Int
lazy var taxRate: Float = {
Float(self.tax_rate)!
}()
private var tax_rate: String
}
One disadvantage of this approach is that you cannot define a let constant if you want to access taxRate, since the first time you access it, you are mutating the struct.
// Cannot use `let` here
var example = try! JSONDecoder().decode(ExampleJson.self, from: data)
I know that this is a really late answer, but I started working on Codable couple of days back only. And I bumped into a similar issue.
In order to convert the string to floating number, you can write an extension to KeyedDecodingContainer and call the method in the extension from init(from decoder: Decoder){}
For the problem mentioned in this issue, see the extension I wrote below;
extension KeyedDecodingContainer {
func decodeIfPresent(_ type: Float.Type, forKey key: K, transformFrom: String.Type) throws -> Float? {
guard let value = try decodeIfPresent(transformFrom, forKey: key) else {
return nil
}
return Float(value)
}
func decode(_ type: Float.Type, forKey key: K, transformFrom: String.Type) throws -> Float? {
return Float(try decode(transformFrom, forKey: key))
}
}
You can call this method from init(from decoder: Decoder) method. See an example below;
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
taxRate = try container.decodeIfPresent(Float.self, forKey: .taxRate, transformFrom: String.self)
}
In fact, you can use this approach to convert any type of data to any other type. You can convert string to Date, string to bool, string to float, float to int etc.
Actually to convert a string to Date object, I will prefer this approach over JSONEncoder().dateEncodingStrategy because if you write it properly, you can include different date formats in the same response.
Hope I helped.
enter link description hereHow to used JSONDecodable in Swift4
1)get the JSON Response and Create Struct
2)conform Decodable class in Struct
3) Other steps in following Project(Simple Example)
来源：https://stackoverflow.com/questions/44594652/swift-4-json-decodable-simplest-way-to-decode-type-change