我知道這可能是一個簡單的答案，但對我來說很難。我有一個 Swift JSON 檔案，它成功加載到我的 UserData 變數中。但我想從那個資料集中得到一個值。我收到錯誤：“[UserData]”型別的值沒有成員“狀態”
[
{
"state":"Alaska",
"latitude":61.3850,
"longitude":-152.2683,
"stateTax":"7%"
},
{
"state":"Alabama",
"latitude":32.7990,
"longitude":-86.8073,
"stateTax":"13.5%"
},
{
"state":"Arkansas",
"latitude":34.9513,
"longitude":-92.3809,
"stateTax":"11.625%"
}
]
我的資料集 UserData：
[LoadFromJSON.UserData(state: "Alaska", latitude: 61.385, longitude: -152.2683, stateTax: "7%"), LoadFromJSON.UserData(state: "Alabama", latitude: 32.799, longitude: -86.8073, stateTax: "13.5%"), LoadFromJSON.UserData(state: "Arkansas", latitude: 34.9513, longitude: -92.3809, stateTax: "11.625%")]
我的代碼和錯誤行：
do {
let data = try Data(contentsOf: fileLocation)
let jsonDecoder = JSONDecoder()
let dataFromJson = try jsonDecoder.decode([UserData].self, from: data)
self.userData = dataFromJson
print(userData)
print(dataFromJson.state) // Value of type '[UserData]' has no member 'state'
} catch {
print(error)
}
uj5u.com熱心網友回復：
dataFromJson是陣列UserData，所以你需要像這樣迭代。
do {
let data = try Data(contentsOf: fileLocation)
let jsonDecoder = JSONDecoder()
let dataFromJson = try jsonDecoder.decode([UserData].self, from: data)
self.userData = dataFromJson
dataFromJson.forEach{ user in
print(user.state)
}
print(userData)
} catch {
print(error)
}
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