如何在Swift 4 Codable中手动解码数组? [英] How to manually decode an an array in swift 4 Codable?
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问题描述
这是我的代码.但是我不知道将值设置为什么.必须手动完成此操作,因为实际结构比此示例稍微复杂些.
Here is my code. But I do not know what to set the value to. It has to be done manually because the real structure is slightly more complex than this example.
请帮忙吗?
struct Something: Decodable {
value: [Int]
enum CodingKeys: String, CodingKeys {
case value
}
init (from decoder :Decoder) {
let container = try decoder.container(keyedBy: CodingKeys.self)
value = ??? // < --- what do i put here?
}
}
推荐答案
由于一些错误/错别字,您的代码无法编译.
Your code doesn't compile due to a few mistakes / typos.
要解码 Int
个数组,请写入
struct Something: Decodable {
var value: [Int]
enum CodingKeys: String, CodingKey {
case value
}
init (from decoder :Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
value = try container.decode([Int].self, forKey: .value)
}
}
但是,如果问题中的示例代码代表整个结构,则可以简化为
But if the sample code in the question represents the entire struct it can be reduced to
struct Something: Decodable {
let value: [Int]
}
因为可以推断出初始化程序和 CodingKeys
.
because the initializer and the CodingKeys
can be inferred.
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