篩選由境界從NSDate的一天，斯威夫特

Question

於是，我把NSDate在領域模型：

class GeneralList: Object { 
    dynamic var createdAt = NSDate() 
    dynamic var notes = "" 
} 

如何獲得，例如，所有2016年3月27日的「注意」？

Answer 1

所以，我找到簡單的方法：

1. 爲字符串創建公共延伸，並與獨立的NSDate創建功能：

   public static func sepaDate(whatNeed: String) -> String { 
   var currentDate = NSDate() 
   let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian) 
   
   let dateComponents = calendar!.components([.Day, .Month, .Year, .Minute, .Hour], fromDate: currentDate) 
       var forReturn: String = "0" 
       switch whatNeed { 
        case "day": 
         let valu = String(dateComponents.day) 
         forReturn = valu 
        case "month": 
        let valu = String(dateComponents.month) 
        forReturn = valu 
        case "year": 
        let valu = String(dateComponents.year) 
        forReturn = valu 
        case "hour": 
        let valu = String(dateComponents.hour) 
        forReturn = valu 
        case "minute": 
        let valu = String(dateComponents.minute) 
        forReturn = valu 
        default: print("Error") 
       } 
       return forReturn 
   } 
   } 
   

2. 在領域類，創建單獨的日期：

   dynamic var minute = String.sepaDate("minute") 
   dynamic var hour = String.sepaDate("hour") 
   dynamic var day = String.sepaDate("day") 
   dynamic var month = String.sepaDate("month") 
   dynamic var year = String.sepaDate("year") 
   

3. 在視圖控制器調用謂詞

   let dayday = String(dateComponents.day) 
        let monthmonth = String(dateComponents.month) 
        let yearyear = String(dateComponents.year) 
        let predicate = NSPredicate(format: "day = %@ AND month = %@ AND year = %@", dayday, monthmonth, yearyear) 
        generalRecords = uiRealm.objects(GeneralList).filter(predicate) 
   

我希望這有助於某人...

Answer 2

您可以實現此功能，從Rafael的answer

private func createMessageRealmModelFromIncomingMessage(incomingMessage: MessageRestModel) -> MessageRealmModel { 
    let messageRealmModel = MessageRealmModel() 

    messageRealmModel.id = incomingMessage.id! 
    messageRealmModel.messageType = "CHAT_MESSAGE" 
    messageRealmModel.value = (incomingMessage.content?.value)! 
    messageRealmModel.senderId = incomingMessage.senderId! 
    messageRealmModel.recipientId = incomingMessage.recipientId! 
    messageRealmModel.sendDate = incomingMessage.sendDate! 
    messageRealmModel.serverDeliveryDate = incomingMessage.serverDeliveryDate! 
    messageRealmModel.receiverDeliveryDate = NSDate().msFromEpoch() 

    return messageRealmModel 
} 

，然後用它作爲像這樣境界的filter函數中的參數：

var c = NSDateComponents() 
c.year = 2016 
c.month = 3 
c.day = 27 

var date = NSCalendar(identifier: NSCalendarIdentifierGregorian)?.dateFromComponents(c) 

let generalListsInDay = realm.objects(GeneralList).filter(self.predicateForDayFromDate(day)) 

執行此代碼您generalListsInDay後應包含所有GeneralList在27.03.2016