swift - 来自 JSON 的 Realm 数据库中的条目
问题描述
对不起翻译（英语很差）
这是来自服务器的 JSON 您需要在课堂上编写所有内容，教程没有帮助
{
"status": "string",
"exercises": [
{
"id": 0,
"uuid": "string",
"name_ru": "string",
"name_en": "string",
"body_part": {
"id": 0,
"uuid": "string",
"name_ru": "string",
"name_en": "string"
},
"equipment": {
"id": 0,
"uuid": "string",
"name_ru": "string",
"name_en": "string"
},
"kind": {
"id": 0,
"uuid": "string",
"name_ru": "string",
"name_en": "string"
}
}
]
}
有必要以新格式（添加了 UUID 字段）实施练习。在来自服务器的每个练习中都有以下数据：肌肉群练习、练习类型、设备。这些实体中的每一个都必须本地存储在 Realm 数据库中，并且必须始终使用 uuid 键执行存在性检查。如果有这样的实体，检查它的基本参数来更新它，以防重要属性发生变化（例如，名称（nameRu））
import RealmSwift
import Foundation
@objcMembers class RealmExercise: Object {
let id = RealmOptional<Int>()
dynamic var uuid = ""
dynamic var nameRu = ""
dynamic var nameEn = ""
dynamic var kind: [Kind]?
dynamic var bodyPart: [BodyPart]?
dynamic var equipment: [Equipment]?
convenience init(nameRu: String, id: Int?, nameEn: String, uuid: String) {
self.init()
self.nameRu = nameRu
self.id.value = id
self.nameEn = nameEn
self.uuid = uuid
}
func idString() -> String? {
guard let id = id.value else { return nil }
return String(id)
}
func create<T: Object>(_ object: T) {
do {
try realm?.write {
realm?.add(object)
}
} catch {
print("error create object")
}
}
}
@objcMembers class Kind: Object {
dynamic var nameRu: String? = ""
dynamic var nameEn: String? = ""
let id = RealmOptional<Int>()
dynamic var uuid = ""
let exercise = List<RealmExercise>()
convenience init(nameRu: String?, id: Int?, nameEn: String?, uuid: String) {
self.init()
self.nameRu = nameRu
self.id.value = id
self.nameEn = nameEn
self.uuid = uuid
}
func idString() -> String? {
guard let id = id.value else { return nil }
return String(id)
}
public func saveOrUpdate() {
let realm = try! Realm()
try! realm.write() {
realm.add(self, update: true)
}
}
}
@objcMembers class BodyPart: Object {
dynamic var nameRu: String? = ""
dynamic var nameEn: String? = ""
let id = RealmOptional<Int>()
dynamic var uuid = ""
let exercise = List<RealmExercise>()
convenience init(nameRu: String?, id: Int?, nameEn: String?, uuid: String) {
self.init()
self.nameRu = nameRu
self.id.value = id
self.nameEn = nameEn
self.uuid = uuid
}
func idString() -> String? {
guard let id = id.value else { return nil }
return String(id)
}
public func saveOrUpdate() {
let realm = try! Realm()
try! realm.write() {
realm.add(self, update: true)
}
}
}
@objcMembers class Equipment: Object {
dynamic var nameRu: String? = ""
dynamic var nameEn: String? = ""
let id = RealmOptional<Int>()
dynamic var uuid = ""
let exercise = List<RealmExercise>()
convenience init(nameRu: String?, id: Int?, nameEn: String?, uuid: String) {
self.init()
self.nameRu = nameRu
self.id.value = id
self.nameEn = nameEn
self.uuid = uuid
}
func idString() -> String? {
guard let id = id.value else { return nil }
return String(id)
}
public func saveOrUpdate() {
let realm = try! Realm()
try! realm.write() {
realm.add(self, update: true)
}
}
}
VievController
var exercise: Results<RealmExercise>!
let users = JSON.object(forKey: "exercises") as! [NSDictionary]
let realm = try! Realm()
users.forEach { userJSON in
let saveExercise = RealmExercise.init(nameRu: userJSON.object(forKey: "name_ru") as! String, id: userJSON.object(forKey: "id") as? Int, nameEn: userJSON.object(forKey: "name_en") as! String, uuid: userJSON.object(forKey: "uuid") as! String)
exercise = realm.objects(RealmExercise.self)
解决方案
我认为这里最好的方法是添加一个名为 SwiftyJSON 的 cocoapod，它使解析 JSON 变得轻而易举。看看我的天气应用程序是如何进行解析的。
import UIKit
import CoreLocation
import Alamofire
import SwiftyJSON
class WeatherViewController: UIViewController, CLLocationManagerDelegate, ChangeCityDelegate {
//Constants
let WEATHER_URL = "http://api.openweathermap.org/data/2.5/weather"
let APP_ID = "8a5f77889dbdb03403fcdbfe3f053215"
//TODO: Declare instance variables here
let locationManager = CLLocationManager()
let weatherDataModel = WeatherDataModel()
//Pre-linked IBOutlets
@IBOutlet weak var weatherIcon: UIImageView!
@IBOutlet weak var cityLabel: UILabel!
@IBOutlet weak var temperatureLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
//TODO:Set up the location manager here.
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters // specify the accuracy for the coordinates
locationManager.requestWhenInUseAuthorization() //you need to add to plist Privacy and request string
locationManager.startUpdatingLocation()
}
//MARK: - Networking
/***************************************************************/
//Write the getWeatherData method here:
func getWeatherData(url: String, parameters: [String:String]){
Alamofire.request(url, method: .get, parameters: parameters).responseJSON {
response in
if response.result.isSuccess{
print("Success got the weather data")
let weatherJSON: JSON = JSON(response.result.value!)
print(weatherJSON)
self.updateWeatherData(json: weatherJSON)
} else {
print("There is an error \(response.result.error ?? "NO ERROR WEIRD" as! Error)")
self.cityLabel.text = "Connection issues"
}
}
}
//MARK: - JSON Parsing
/***************************************************************/
//Write the updateWeatherData method here:
func updateWeatherData(json: JSON) {
if let tempResult = json["main"]["temp"].double {
weatherDataModel.temperature = Int(tempResult - 273.15)
weatherDataModel.city = json["name"].stringValue
weatherDataModel.condition = json["weather"][0]["id"].intValue
weatherDataModel.weatherIconName = weatherDataModel.updateWeatherIcon(condition: weatherDataModel.condition)
updateUIWithWeatherData()
} else {
cityLabel.text = "Weather unavailable :("
}
}
//MARK: - UI Updates
/***************************************************************/
//Write the updateUIWithWeatherData method here:
func updateUIWithWeatherData(){
temperatureLabel.text = "\(weatherDataModel.temperature)℃"
cityLabel.text = weatherDataModel.city
weatherIcon.image = UIImage(named: weatherDataModel.weatherIconName)
}
//MARK: - Location Manager Delegate Methods
/***************************************************************/
//Write the didUpdateLocations method here:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[locations.count - 1]
if location.horizontalAccuracy > 0 { //if it is below zero it is invalid this is why we check this
locationManager.stopUpdatingLocation()
locationManager.delegate = nil
print("Latitude: \(location.coordinate.latitude) Logitude: \(location.coordinate.longitude)")
let latitude = String(location.coordinate.latitude)
let longitude = String(location.coordinate.longitude)
let params: [String : String] = ["lat":latitude, "lon":longitude, "appid":APP_ID]
getWeatherData(url: WEATHER_URL, parameters: params)
}
}
//Write the didFailWithError method here:
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print(error)
cityLabel.text = "Location unavailable!"
}
//MARK: - Change City Delegate methods
/***************************************************************/
//Write the userEnteredANewCityName Delegate method here:
func userEnteredANewCityName(city: String) {
print(city)
let params: [String : String] = ["q" : city, "appid" : APP_ID]
getWeatherData(url: WEATHER_URL, parameters: params)
}
//Write the PrepareForSegue Method here
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "changeCityName" {
let destinationVC = segue.destination as! ChangeCityViewController
destinationVC.delegate = self //we are setting the ChangeCityViewController's delegate to be this View Controller which is WeatheViewController
}
}
}
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