在swift 3中将字符串转换为日期类型 [英] Convert string to DATE type in swift 3

问题描述

我有这个结构:

struct message {变量 ID:字符串 =0"var 文本:字符串 = ""var 日期:日期！变量状态:字符串 = ""}

我必须从 dbase 加载这个结构，它以 String 格式和 date 导出.所以我写了这段代码把String转换成Date类型:

let dateFormatter = DateFormatter()dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"dateFormatter.timeZone = NSTimeZone(缩写:UTC")作为时区！让 dataDate = dateFormatter.date(from: elemMessage["date"] as!String)！

我在结构中加载它:

message(id: elemMessage["id"] as!String, text: elemMessage["text"] as!String, date: dataDate as!Date, status: elemMessage["status"] as!String)

但是我有这个警告:从 Date 转换到无关类型 Date 总是失败"

因此，如果我运行应用程序，它将失败.

我该如何解决这个问题，结构中的 date 变量必须是 Date 类型.

谢谢.

解决方案

您可以将 String Date 转换为 Date/NSDate 如下代码:-

<块引用>

Swift 3.2 &Swift 4.2

字符串到日期

let dateFormatter = DateFormatter()dateFormatter.dateFormat = "dd-MM-yyyy";//你的日期格式dateFormatter.timeZone = TimeZone(abbreviation: "GMT+0:00")//当前时区//根据日期格式你的日期字符串守卫让日期= dateFormatter.date(来自:01-01-2017")其他{致命错误()}打印(日期)//将字符串转换为日期

---

日期到字符串

dateFormatter.dateFormat = "MMM d, yyyy";//您的新日期格式根据要求更改它自己let newDate = dateFormatter.string(from: date)//在这里传递日期print(newDate)//新格式化的日期字符串

---

输出:-

2017-01-11 00:07:00 +00002017 年 1 月 11 日

I have this structure:

struct message {

  var id: String = "0"
  var text: String = ""
  var date: Date!
  var status: String = "" 
}

I have to load this structure from dbase, that it export in String format also date. So I write this code to convert String to Date type:

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(abbreviation: "UTC") as TimeZone!
let dataDate = dateFormatter.date(from: elemMessage["date"] as! String)!

And I load it in structure:

message(id: elemMessage["id"] as! String, text: elemMessage["text"] as! String, date: dataDate as! Date, status: elemMessage["status"] as! String)

But I have this warning: "Cast from Date to unrelated type Date always fails"

So if I run app it will fails.

How Can I fix this, the date var in structure have to be Date type.

Thank you.

解决方案

You can convert String Date into Date/NSDate like below code: -

Swift 3.2 & Swift 4.2

String to Date

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy" //Your date format
dateFormatter.timeZone = TimeZone(abbreviation: "GMT+0:00") //Current time zone
//according to date format your date string
guard let date = dateFormatter.date(from: "01-01-2017") else {
    fatalError()
}
print(date) //Convert String to Date

---

Date to String

dateFormatter.dateFormat = "MMM d, yyyy" //Your New Date format as per requirement change it own
let newDate = dateFormatter.string(from: date) //pass Date here
print(newDate) //New formatted Date string

---

Output: -

2017-01-11 00:07:00 +0000
Jan 11, 2017

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