如何在 ios 中将数据类型声明为 Timestamp - swift

Question

我是一名iOS编程新手。我正在创建一个与Firestore. 在Firestore我创建的集合中，每个文档都包含许多字段。

我在我的文档中添加了Timestamp字段。当我创建模型时，xcode我如何声明我的变量，Timestamp因为我需要tableView基于Timestamp.

Timestamp看起来是这样Firestore的：

September 17, 2018 at 3:37:43 PM UTC+7

那么，我如何编写程序并获取当前的信息，Timestamp如所示Firestore

这是编程中的：

struct RecentCallModel {

var call_answered: Bool?
var call_extension: String?
var call_type: String?
var details: String?
var duration:  String?
var title: String?
// How can i declare as Timestamp
var timestamp: ???

init(call_answered: Bool, call_extension: String, call_type: String, details: String , duration: String, timestamp: String,  title: String) {

    self.call_answered = call_answered
    self.call_extension = call_extension
    self.call_type = call_type
    self.details = details
    self.title = title
 }


}

Answer 1

不熟悉 Firebase。但通常，在 iOS 中，我们将时间戳存储TimeInterval为Double.

class func getDateOnly(fromTimeStamp timestamp: TimeInterval) -> String { 
  let dayTimePeriodFormatter = DateFormatter()
  dayTimePeriodFormatter.timeZone = TimeZone.current 
  dayTimePeriodFormatter.dateFormat = "MMMM dd, yyyy - h:mm:ss a z" 
  return dayTimePeriodFormatter.string(from: Date(timeIntervalSince1970: timestamp)) 
}