iOS本地化 UserDefaults

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UserDefaults

内置类型

存储

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UserDefaults.standard.set(phone, forKey: self.phoneNumberKey)

读取

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let phoneNumber = UserDefaults.standard.string(forKey: self.phoneNumberKey)

自定义类型

对于自定义类型，需要用JSONEncoder和JSONDecoder转为Data类型才能进行存取，需要实现数据结构的encode和decode

数据结构

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struct User: Codable {
    let id: Int
    let phone: String

    enum Codingkeys: String, CodingKey {
        case id, phone
    }

    init?(decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        self.id = try values.decode(Int.self, forKey: .id)
        self.phone = try values.decode(String.self, forKey: .phone)
    }

    func encode(to encode: Encoder) throws {
        var container = encode.container(keyedBy: CodingKeys.self)
        try container.encode(id, forKey: .id)
        try container.encode(phone, forKey: .phone)
    }
}

存储

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do {
    let userData = try JSONEncoder().encode(UserAgent.shared.loginUser)
    UserDefaults.standard.set(userData, forKey: self.userDataKey)
} catch {
    print("encode errors: \(error)")
}

读取

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do {
    let userData = UserDefaults.standard.data(forKey:self.userDataKey)
    UserAgent.shared.loginUser = try JSONDecoder().decode(User.self, from: userData)
} catch {
    print("decode error: \(error)")
}
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