iOS-RealmSwift

Question

我已经使用 Realmsvift 在我的应用程序中创建了数据库。这是控制台中的输出。请告诉我，如何在应用程序中从中读取数据？例如，我想显示键值对:Oslo - 2.89。感谢您的帮助。

class ViewController: UIViewController {
var city_list: [String] = ["Moscow", "London", "Oslo", "Paris"]
let realm = try! Realm()
override func viewDidLoad() {
    super.viewDidLoad()
    let manager: ManagerData = ManagerData()
    for name in city_list {
        manager.loadJSON(city: name)
    }
    let localWeather = realm.objects(WeatherData.self)
    print(localWeather)

/////////////////////////////////////

Results<WeatherData> (
[0] WeatherData {
    city_name = Moscow;
    tempList = RLMArray <0x6080002e2b00> (
        [0] Temp {
            temp = -4.25;
        }
    );
},
[1] WeatherData {
    city_name = London;
    tempList = RLMArray <0x6000002e4700> (
        [0] Temp {
            temp = 9.630000000000001;
        }
    );
},
[2] WeatherData {
    city_name = Paris;
    tempList = RLMArray <0x6000002e4800> (
        [0] Temp {
            temp = 6.59;
        }
    );
},
[3] WeatherData {
    city_name = Oslo;
    tempList = RLMArray <0x6000002e4900> (
        [0] Temp {
            temp = -2.89;
        }
    );
}

Answer 1

如果我正确理解你的问题，你想从每个模型中获取属性。

如果是这样的话，你就快成功了。 localWeather就像 Realm 世界中的数组(例如 Results<WeatherData> 的类型)。

您可以像普通 swift 的数组/对象一样访问它:

let firstWeather = localWeather[0]
let name = firstWeather.city_name
let temp = firstWeather.tempList[0].temp

// do what you want with 'name' and 'temp', e.g. key-value
print("\(name) - \(temp)")