SwiftUI how to bind DatePicker with a variable of type 'TimeStamp'?

Question

I am trying to Bind UIDatePicker with a variable that is coming straight from Server but the issue is variable has a type of TimeStamp and UIDatePicker requires a type of Date.

if(self.shouldShowDatePicker)
{
    DatePicker(selection:self.$taskData.fields[index].dateField.valueTime , displayedComponents: .date)
    Text("DatePicker")
}

Now I know that this variable self.$taskData.fields[index].dateField.valueTime is of TimeStamp type, and since you can see that this variable belongs to a very complex array of fields so I cannot alter the structure. Please let me know what is the possible solution. Thanks

Asperi · Accepted Answer · 2020-01-31 09:10:13Z

2

You can wrap it in dynamic Binding, like the following

if(self.shouldShowDatePicker)
{
   DatePicker(selection: Binding<Date>(
       get: { Date(timeIntervalSince1970: self.taskData.fields[index].dateField.valueTime) },
       set: { self.taskData.fields[index].dateField.valueTime = $0.timeIntervalSince1970 } ), 
       displayedComponents: [.date]) { Text("DatePicker") }
}

edited Jan 31, 2020 at 9:10

answered Jan 29, 2020 at 15:57

Asperi

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3 Comments

Najam Over a year ago

I got this error 'Generic parameter 'SelectionValue' could not be inferred' after adding your piece of code.

Asperi Over a year ago

@Najam, I wrote just inline from your snapshot to show the idea of binding, try updated. Compiling errors might be just due to typos.

Asperi Over a year ago

@Najam, tested with self.timestamp replaced your model - compiled & worked. Xcode 11.2 / iOS 13.2

lorem ipsum · Accepted Answer · 2020-01-29 16:26:49Z

0

An extension should do the trick

extension Double {
    var _boundDate: Date {
        get {
            return Date(timeIntervalSince1970: self )
        }
        set {
            self = newValue.timeIntervalSince1970
        }
    }
    public var boundDate: Date {
        get {
            return _boundDate
        }
        set {
            _boundDate = newValue
        }
    }
}

Your binding on the DatePicker would look like this

self.$taskData.fields[index].dateField.valueTime.boundDate

answered Jan 29, 2020 at 16:26

lorem ipsum

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1 Comment

lorem ipsum Over a year ago

@Najam What type is valueTime? Is it a Double or TimeInterval? Is TimeStamp a Custom class? If so, you can replace Double on my code with TimeStamp and adjust the _boundDate get set methods to point to the seconds in the TimeStamp class.

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