ios - 时间戳不会改变字符串格式

Question

let dateFormater : DateFormatter = DateFormatter()
dateFormater.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
let date = dateFormater.date(from: "2016-11-11T11:42:27Z")
print("date is  ---->%@",date)

let timestamp = date?.timeIntervalSince1970
print("timestamp is  ---->%@",timestamp!)

let str =  String(format: "%@",timestamp!)
print("str value is ---->%@",str)

date is -----> 2016-11-11 11:42:27 +000
timestamp is----->1478864547.0
str value is-----> null

获取日期和时间戳值。如何将 timestamp 值更改为字符串。表示 1478864547.0(timestampvalue) 到字符串 formate

let str = String(format: "%@",timestamp!) 这行有什么问题。

Answer 1

您可以简单地使用 let timestampInString = "\(timestamp)"。

如果是可选的则

if let timestamp = date?.timeIntervalSince1970 {
     let timestampInString = "\(timestamp)"
}