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Swift JSONDecoder typeMismatch error2个
我对此很新手,但我一直试图弄清楚JSONDecoder如何为需要从MysqL数据库检索数据的登录功能起作用,如下面的代码所示,并且收到此错误.
我对此很新手,但我一直试图弄清楚JSONDecoder如何为需要从MysqL数据库检索数据的登录功能起作用,如下面的代码所示,并且收到此错误.
SWIFT代码：
func testParseJson(){
var request = URLRequest(url: URL(string: "https://test.PHP")!)
request.httpMethod = "POST"
let postString = ("Email=test&Password=test")
print(postString)
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data,response,error in
guard let data = data else { return }
do {
var responseString = String(data: data,encoding: .utf8)!
print("new response string \(responseString)")
let decoder = JSONDecoder()
let newData = try decoder.decode(User.self,from: data)
print(newData.Email)
print(newData.UserType)
} catch let err {
print("Err",err)
}
}.resume()
}
临时结构我一直试图使用：
struct User: Decodable {
let U_ID: String
let Email: String
let Password: String
let UserType: String
private enum CodingKeys: String,CodingKey {
case U_ID
case Email
case Password
case UserType
}
}
JSON响应字符串如下：
[{"U_ID":"1","Email":"test","Password":"test","UserType":"Teacher"}]
任何帮助都将受到大力赞赏.
这里,JSON数据是对象数组.
更改
try decoder.decode(User.self,from: data)
至
try decoder.decode(Array<User>.self,from: data)
例：
var users = [User]()
let data = """
[{"U_ID":"1","UserType":"Teacher"}]
""".data(using: .utf8)
do{
users = try JSONDecoder().decode(Array<User>.self,from: data!)
}catch{
print(error.localizedDescription)
}
print(users.first?.Email)
注意：为了更好地理解,这是我在video系列中关于swift 4中的JSON解析
