如何将数据作为Timestamp数据类型发布到Firestore - swift

Question

我想知道如何才能以String格式将数据以Timestamp格式发布到Firestore。我正在创建一个示例应用程序，该应用程序将数据存储在tableView上，数据将基于Timestamp排序。

因此，在编程中，我试图将当前时间和日期设置为String，但我不知道如何将数据设置为Firestore，因为字段为Timestamp。当我从Firestore查询数据时，我希望根据Timestamp对数据进行排序。

let currentDateTime = Date()

// initialize the date formatter and set the style
let formatter = DateFormatter()
formatter.timeStyle = .long
formatter.dateStyle = .long

// get the date time String from the date object
formatter.string(from: currentDateTime)

Firestore中的Timestamp包含日期和时间。如何以String格式将数据以Timestamp格式发布到Firestore

Answer 1

如果我理解正确的话，您想在Firestore中以时间戳或日期存储文件？

从字面上看，时间戳就是日期，一种更简单的方法是将其存储为时间戳，因为它只是一个将在Firestore中排序的数字。

   let timestamp = Int(NSDate.timeIntervalSinceReferenceDate*1000).description

Image Link : This will be the end result

Answer 2

为什么你想把它发布为String？下面是我使用Int的方法

let timestamp = Int(Date().timeIntervalSince1970) // gives you an Int like 1534840591

然后，当您从Firebase解析它时，将它传递给类似如下的func，以便将Int时间戳转换为日期：

 func timestampIntToString(integerTime: Int, timestampLabel: UILabel) {
    let timestampDate = Date(timeIntervalSince1970: Double(integerTime))
    let now = Date()
    let components = Set<Calendar.Component>([.second, .minute, .hour, .day, .weekOfMonth])
    let difference = Calendar.current.dateComponents(components, from: timestampDate, to: now)
    var timeText = ""

    if difference.second! <= 0 {
        timeText = "now"
    }
    if difference.second! > 0 && difference.minute! == 0 {
        timeText =  "\(difference.second!) sec ago"
    }
    if difference.minute! > 0 && difference.hour! == 0 {
        timeText =  "\(difference.minute!) min"
    }
    if difference.hour! > 0 && difference.day! == 0 {
        timeText =  "\(difference.hour!)h"
    }
    if difference.day! > 0 && difference.weekOfMonth! == 0 {
        timeText =  (difference.day == 1) ? "\(difference.day!)day" : "\(difference.day!) days ago"
    }
    if difference.weekOfMonth! > 0 {
        timeText =  (difference.weekOfMonth == 1) ? "\(difference.weekOfMonth!) w" : "\(difference.weekOfMonth!)w"
    }

    timestampLabel.text = timeText
}