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[英]check whether each value in json array are present in other json file
[英]Check if value is present in JSON array, if not check next array(Swift / SwiftUI)
我有用户名和密码,我需要根据 JSON 文件中的数据检查这两个数据,如果两者都正确/存在,我会返回一个包含“项目”中数据的列表。
例如:如果我输入“user”作为用户名并输入“pass”作为密码,视图应该在列表中显示“Dog, Cat, Mouse, Parrot, Goldfish”。
如果我的语法不正确,可以修改 JSON 文件。
JSON:
[
{
"username": "user",
"password": "pass",
"type": "Animals",
"items": ["Dog",
"Cat",
"Mouse",
"Parrot",
"Goldfish"
]
},
{
"username": "helloworld",
"password": "firstprogram",
"type": "States",
"items": ["Not Running",
"Inactive",
"Active",
"Background",
"Suspended"
]
},
{
"username": "movielover",
"password": "bestmovies",
"type": "Movies",
"items": ["Kill Bill",
"Us",
"Parasite",
"Coco",
"Inception"
]
},
]
Swift 用户界面代码:
import SwiftUI
struct LoginView: View {
var userName = "user"
var items: UserModel = UserModelData().userInformation[0]//this only displays data
for the first item in the array, I would like to check each item,find the one
that contains userName, and use that index.
var body: some View{
VStack{
Text("\(items.username)'s \(items.type)")
.font(.title)
.fontWeight(.bold)
if userName == items.username{
Form{
List(items.items, id: \.self){ item in
Text(item)
}
}
}
}
}
}
struct LoginView_Previews: PreviewProvider {
static var previews: some View {
LoginView()
}
}
您可以使用first(where:)
在数组中查找与给定条件匹配的项目(在这种情况下,用户名匹配)。 它返回一个可选的,因为不能保证会有一个匹配的项目。
由于您没有包含它们,因此我不得不将UserModel
和UserModelData
存根,因此您需要确保类型名称与您所拥有的名称匹配。
struct UserModel {
var username : String
var password : String
var items : [String]
var type: String
}
struct UserModelData {
var userInformation : [UserModel] = []
}
struct LoginView: View {
var userName = "user"
private var userModelData = UserModelData()
var userInformation : UserModel? {
userModelData.userInformation.first { $0.username == userName }
}
var body: some View{
VStack {
if let userInformation = userInformation {
Text("\(userInformation.username)'s \(userInformation.type)")
.font(.title)
.fontWeight(.bold)
Form {
List(userInformation.items, id: \.self) { item in
Text(item)
}
}
}
}
}
}
您可以使用过滤器实现此目的:
var item: UserModel = UserModelData().userInformation.filter({ $0.username == "user" && $0.password == "pass" }).first
此外,您可以将此逻辑移至 UserModelData 并执行以下操作:
var serModelData = UserModelData()
lazy var item: UserModel = userModelData.retrieveUserModel(for: "user", and: "pass")
在哪里:
class UserModelData {
...
func retrieveUserModel(for username: String, and password: String) {
userInformation
.filter({ $0.username == username && $0.password == password }).first
}
}
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