在RxSwift中使用swift 4可解码协议

struct Person: Codable {
    let name: String
    let age: Int
}

let json = """
{
    "name": "John",
    "age": 30
}
"""

if let jsonData = json.data(using: .utf8) {
    do {
        let person = try JSONDecoder().decode(Person.self, from: jsonData)
        print(person.name) // 输出：John
        print(person.age) // 输出：30
    } catch {
        print("解码失败：\(error)")
    }
}

import RxSwift

func decodePerson(from json: String) -> Observable<Person> {
    return Observable.create { observer in
        if let jsonData = json.data(using: .utf8) {
            do {
                let person = try JSONDecoder().decode(Person.self, from: jsonData)
                observer.onNext(person)
                observer.onCompleted()
            } catch {
                observer.onError(error)
            }
        }
        
        return Disposables.create()
    }
}

let json = """
{
    "name": "John",
    "age": 30
}
"""

decodePerson(from: json)
    .subscribe(onNext: { person in
        print(person.name) // 输出：John
        print(person.age) // 输出：30
    }, onError: { error in
        print("解码失败：\(error)")
    })
    .disposed(by: disposeBag)