swift - 同时维护列表中的 Realm - 其中的所有值都相同

Question

我有两个数据模型，想用加载的 json 代码中的值填充它们，它有一组唯一的输入值。但是在 Realm 中保存之后，我得到了一个均值相同的数组(等于原始数组中的最后一个值)。

import Foundation
import RealmSwift

class Data: Object {
    dynamic var city_n: String = ""
    var templst = List<temp>()
    dynamic var update_d = NSDate()

    override static func primaryKey() -> String? {
        return "city_n"
    }
}
import Foundation
import RealmSwift

class temp: Object {
        dynamic var t: String = ""
}

以及填充它们的函数

Alamofire.request(.GET, URL , parameters: param)
                .responseJSON { response in
                    switch response.result {
                        case .Success:
                            if let value = response.result.value {
                                let json = JSON(value)
                                onlineLW.city_n = json["city"]["name"].stringValue
                                onlineLW.update_d = NSDate()
                                var temp_arr: [String] = []
                                for (_,subJson):(String, JSON) in json["list"] {
                                    ot.t = subJson["main"]["temp"].stringValue
                                    onlineLW.templst.append(ot)
                                    temp_arr.append(subJson["main"]["temp"].stringValue)
                                }
                                for var i = 1; i < temp_arr.count; i++ {
                                    onlineLW.templst[i].t = temp_arr[i]
                                    print("onlineLW.templst[i].t = \(onlineLW.templst[i].t)")
                                    print("temp_arr[i] = \(temp_arr[i])")
//                                    onlineLW.templst.append(ot)
                                }

                               print(onlineLW.templst)
                                try! self.realm.write {
                                    self.realm.add(onlineLW, update: true)
                                }
                               load.flag = true
                        }
                        case .Failure(let error):
                            print(error)
                    }

输出是相同元素的列表。可能是什么问题？谢谢。

执行结果:

onlineLW.templst[i].t = 279.59
temp_arr[i] = 279.59
onlineLW.templst[i].t = 278.13
temp_arr[i] = 278.13
onlineLW.templst[i].t = 275.09
temp_arr[i] = 275.09
onlineLW.templst[i].t = 272.77
temp_arr[i] = 272.77
onlineLW.templst[i].t = 275.26
temp_arr[i] = 275.26
onlineLW.templst[i].t = 278.3
temp_arr[i] = 278.3
onlineLW.templst[i].t = 281.9
temp_arr[i] = 281.9
onlineLW.templst[i].t = 282.85
temp_arr[i] = 282.85
onlineLW.templst[i].t = 282.39
temp_arr[i] = 282.39
onlineLW.templst[i].t = 277.75
temp_arr[i] = 277.75
onlineLW.templst[i].t = 278.42
temp_arr[i] = 278.42
onlineLW.templst[i].t = 276.82
temp_arr[i] = 276.82
onlineLW.templst[i].t = 278.82
temp_arr[i] = 278.82
onlineLW.templst[i].t = 278.55
temp_arr[i] = 278.55
onlineLW.templst[i].t = 278.94
temp_arr[i] = 278.94
onlineLW.templst[i].t = 280.73
temp_arr[i] = 280.73
onlineLW.templst[i].t = 279.79
temp_arr[i] = 279.79
onlineLW.templst[i].t = 277.639
temp_arr[i] = 277.639
onlineLW.templst[i].t = 276.363
temp_arr[i] = 276.363
onlineLW.templst[i].t = 274.554
temp_arr[i] = 274.554
onlineLW.templst[i].t = 274.191
temp_arr[i] = 274.191
onlineLW.templst[i].t = 273.961
temp_arr[i] = 273.961
onlineLW.templst[i].t = 273.637
temp_arr[i] = 273.637
onlineLW.templst[i].t = 276.294
temp_arr[i] = 276.294
onlineLW.templst[i].t = 277.662
temp_arr[i] = 277.662
onlineLW.templst[i].t = 275.412
temp_arr[i] = 275.412
onlineLW.templst[i].t = 273.323
temp_arr[i] = 273.323
onlineLW.templst[i].t = 272.665
temp_arr[i] = 272.665
onlineLW.templst[i].t = 272.789
temp_arr[i] = 272.789
onlineLW.templst[i].t = 272.563
temp_arr[i] = 272.563
onlineLW.templst[i].t = 274.97
temp_arr[i] = 274.97
onlineLW.templst[i].t = 279.417
temp_arr[i] = 279.417
onlineLW.templst[i].t = 279.376
temp_arr[i] = 279.376
onlineLW.templst[i].t = 276.51
temp_arr[i] = 276.51
onlineLW.templst[i].t = 273.889
temp_arr[i] = 273.889
onlineLW.templst[i].t = 271.158
temp_arr[i] = 271.158
Data {
    city_n = Paris;
    update_d = 2016-02-12 09:27:31 +0000;
    templst = List<temp> (
        [0] temp {
            t = 271.158;
        },
        [1] temp {
            t = 271.158;
        },
        [2] temp {
            t = 271.158;
        },
        [3] temp {
            t = 271.158;
        },
        [4] temp {
            t = 271.158;
        },
        [5] temp {
            t = 271.158;
        },
        [6] temp {
            t = 271.158;
        },
        [7] temp {
            t = 271.158;
        },
        [8] temp {
            t = 271.158;
        },
        [9] temp {
            t = 271.158;
        },
        [10] temp {
            t = 271.158;
        },
        [11] temp {
            t = 271.158;
        },
        [12] temp {
            t = 271.158;
        },
        [13] temp {
            t = 271.158;
        },
        [14] temp {
            t = 271.158;
        },
        [15] temp {
            t = 271.158;
        },
        [16] temp {
            t = 271.158;
        },
        [17] temp {
            t = 271.158;
        },
        [18] temp {
            t = 271.158;
        },
        [19] temp {
            t = 271.158;
        },
        [20] temp {
            t = 271.158;
        },
        [21] temp {
            t = 271.158;
        },
        [22] temp {
            t = 271.158;
        },
        [23] temp {
            t = 271.158;
        },
        [24] temp {
            t = 271.158;
        },
        [25] temp {
            t = 271.158;
        },
        [26] temp {
            t = 271.158;
        },
        [27] temp {
            t = 271.158;
        },
        [28] temp {
            t = 271.158;
        },
        [29] temp {
            t = 271.158;
        },
        [30] temp {
            t = 271.158;
        },
        [31] temp {
            t = 271.158;
        },
        [32] temp {
            t = 271.158;
        },
        [33] temp {
            t = 271.158;
        },
        [34] temp {
            t = 271.158;
        },
        [35] temp {
            t = 271.158;
        },
        [36] temp {
            t = 271.158;
        }
    );
}

Answer 1

看起来您正在附加 ot在第一个 for 循环的每次迭代中添加到列表中。自 ot当您更改其 t 时，它是一个引用类型(在这种特殊情况下它是一个类)值在下一次迭代中它会更改所有先前附加的值 t .为了解决这个问题，我会像这样更改您的第一个 for 循环:

for (_,subJson):(String, JSON) in json["list"] {
    let newOt = temp()
    newOt.t = subJson["main"]["temp"].stringValue
    onlineLW.templst.append(newOt)
    temp_arr.append(subJson["main"]["temp"].stringValue)
}

上面的 for 循环创建了一个新的 temp在每次迭代中并将其附加到您的列表中，因此这应该可以解决您的问题。如果这解决了这个问题，您甚至可以完全删除第二个 for 循环并删除 temp_arr .希望他能有所帮助。