(Swift) 从用户输入设置 UIDatePicker 视图 [英] (Swift) Setting UIDatePicker View from User Input

问题描述

首先我在屏幕上显示一个 UIDatePicker 并允许用户选择日期和时间.我像这样保存该值，它得到的日期格式如下所示:6/1/16, 1:47 PM

First I display a UIDatePicker on the screen and allow the user to choose a date and time. I save that value like this, which gets a date format that looks like this: 6/1/16, 1:47 PM

let time = NSDateFormatter.localizedStringFromDate(datePicker.date, dateStyle: .ShortStyle, timeStyle: .ShortStyle)

稍后在应用程序中，我希望用户能够编辑他们的原始日期，因此当按下按钮时，我希望 UIDatePicker 显示他们最初选择的时间.
我正在使用以下代码来尝试实现这一点，尽管应用程序不断收到运行时错误，因为日期始终为零.

Later on in the application, I want users to be able to edit their original date, so when a button is pressed, I would like the UIDatePicker to display the time that they had originally chosen.
I am using the following code to try to make that happen, although the app keeps getting a runtime error because the date is always nil.

let dateFromatter = NSDateFormatter()
let date = dateFromatter.dateFromString("6/1/16, 1:47 PM")
datePicker.setDate(date!, animated: true) 

感谢您的帮助！

推荐答案

您遇到的是日期格式问题，而不是日期选择器问题.

You are having an issue with the date format and not with the date picker.

 @IBOutlet weak var datePicker: UIDatePicker!
 override func viewDidLoad() {
    super.viewDidLoad()

    let dateFromatter = NSDateFormatter()
    dateFromatter.dateFormat = "M/d/yy, H:mm"
    if let date = dateFromatter.dateFromString("6/1/16, 1:47") {
      datePicker.setDate(date, animated: true)
    }
  }

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