Hi i need help with making lazy property.
I have this code:
lazy var dateFormat: DateFormatter =
{
let formatter = DateFormatter()
formatter.locale = NSLocale.current
formatter.dateFormat = "dd/MM/YYYY hh:mm"
return formatter
}()
And when using it in Text(date, formatter: self.dateFormat)
I am getting this error Cannot use mutating getter on immutable value: 'self' is immutable
You can use static instead of lazy.
struct Formatter: View {
var date = Date()
private static var dateFormat: DateFormatter = {
let formatter = DateFormatter()
formatter.locale = NSLocale.current
formatter.dateFormat = "dd/MM/YYYY hh:mm"
return formatter
}()
var body: some View {
Text("\(date, formatter: Self.dateFormat)")
}
}
The answers about using a date formatter in SwiftUI aren't wrong, but none of them correctly handle the localised date format. If you aren't going to use any of the predefined date formats you should use the DateFormatter instance function setLocalizedDateFormatFromTemplate(_ dateFormatTemplate: String).
This lets you pass in the format you want - and cleverly applies the correct localised versions of that format: You can try it out in a Swift Playground:
You can see that the correct locale is used to render the date string.
You cannot use lazy within SwiftUI view, if you want in this specific case can be used static, as in below example
struct TestView: View {
static var dateFormat: DateFormatter =
{
let formatter = DateFormatter()
formatter.locale = NSLocale.current
formatter.dateFormat = "dd/MM/YYYY hh:mm"
return formatter
}()
// ... other code
// use as TestView.dateFormat
as alternate you can move lazy var dateFormat into related view model class and use it from corresponding instance.
