在UIDatePicker swift 4中将启用时间限制为特定时间跨度

Question

我正在尝试将 datePicker 的时间限制为 09:00 AM 到 09:00 PM (21:00)，时间间隔为 30 分钟。我已经尝试了所有已知的方法，并且已经在互联网上搜索了很长时间。但我什么也没找到。 这是我写的代码

//datePicker.setDate(dateFormatter.date(from: "09.00")!, animated: true)
datePicker.maximumDate = Calendar.current.date(byAdding: .hour, value: -12, to: dateFormatter.date(from: "21.00")!) //)Calendar.current.date(byAdding: Calendar.Component.hour, value: 1, to: Date())
 datePicker.minimumDate = Calendar.current.date(byAdding: Calendar.Component.hour, value: -12, to: dateFormatter.date(from: "09.00")!)

但它没有用。请帮忙。

Answer 1

限制用户，因此她/他只能选择 9 到 12 之间的日期，但会显示所有可用选项，因为这是日期选择器视图的默认行为，但通过设置正确的 minimumDate 和 ma​​ximumDate 用户只能在 9 到 21 之间选择。试试下面的代码，让我知道它是否有效

如果你想显示你选择的时间，我会建议更好地创建一个你想显示的时间数组，所以用户只会从你提供的数组中选择在这种情况下，时间介于上午 9 点和晚上 9 点，如 [9:00,9:30,10:00,10:30,.....,21:00] 并将该数组设置为普通选择器

datePicker.datePickerMode = .time // setting mode to timer so user can only pick time as you want 
datePicker.minuteInterval = 30  // with interval of 30 
let dateFormatter = DateFormatter()
dateFormatter.dateFormat =  "HH:mm"

let min = dateFormatter.date(from: "9:00")      //createing min time
let max = dateFormatter.date(from: "21:00") //creating max time
datePicker.minimumDate = min  //setting min time to picker
datePicker.maximumDate = max  //setting max time to picker

Answer 2

您要输入minimumDate 和maximumDate 的值是当前日期的上午9 点和晚上9 点。当前日期是您的代码中缺少的日期

let cal = Calendar.current
let now = Date()  // get the current date and time (2018-03-27 19:38:44)
let components = cal.dateComponents([.day, .month, .year], from: now)  // extract the date components 28, 3, 2018
let today = cal.date(from: components)!  // build another Date value just with date components, without the time (2018-03-27 00:00:00)
datePicker.minimumDate = today.addingTimeInterval(60 * 60 * 9)  // adds 9h
datePicker.maximumDate = today.addingTimeInterval(60 * 60 * 21) // adds 21h

Answer 3

您是否尝试通过情节提要实现这一目标？

尝试以下配置：

来自代码：

let calendar = Calendar.current
var dateComponents = calendar.dateComponents([.day, .month, .year], from: Date())
dateComponents.setValue(9, for: .hour)
let minDate = Calendar.current.date(from: dateComponents)
dateComponents.setValue(21, for: .hour)
let maxDate = Calendar.current.date(from: dateComponents)

self.datePicker?.minimumDate = minDate
self.datePicker?.maximumDate = maxDate
self.datePicker?.minuteInterval = 30

Answer 4

试试这个：

let now = Date()
datePicker.datePickerMode = .time
datePicker.minimumDate = Calendar.current.date(bySettingHour: 9, minute: 0, second: 0, of: now)
datePicker.maximumDate = Calendar.current.date(bySettingHour: 21, minute: 0, second: 0, of: now)
datePicker.minuteInterval = 30