Question

我使用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，如何从应用程序中读取数据？例如，我想显示键值：Oslo - 2.89。谢谢你的帮助。

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，你几乎就在那里。 localWeather就像领域世界中的数组（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)")

iOS - RealmSwift

1 个答案: