在iOS Swift中将NSDate转换为字符串

Question

我正在尝试将a转换NSDate为a String，然后更改格式。但是当我传递NSDate给String它时会产生空白。

 let formatter = DateFormatter()
 let myString = (String(describing: date))
 formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
 let yourDate: Date? = formatter.date(from: myString)
 formatter.dateFormat = "dd-MMM-yyyy"
 print(yourDate)

Answer 1

您可以从Apple
Dateformatter文档中
获取详细信息。如果要为dateString设置dateformat，请参阅此链接，您可以在此处获取详细的dateformat ，例如

let formatter = DateFormatter()
// initially set the format based on your datepicker date / server String
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

let myString = formatter.string(from: Date()) // string purpose I add here 
// convert your string to date
let yourDate = formatter.date(from: myString)
//then again set the date format whhich type of output you need
formatter.dateFormat = "dd-MMM-yyyy"
// again convert your date to string
let myStringafd = formatter.string(from: yourDate!)

print(myStringafd)

你得到的输出为