SwiftUI Text field default value

Question

I am trying to set a default value in a text field but I don't know how.

//TextField("", text:$name)

struct MyView: View {

    @State var name:String = ""

    var body: some View {
        TextField("", text:$name)
    }

    init(n:String) {
        name = n
    }
}

If I call MyView("Jack"), Jack does not appear as a value in the textfield.

Martijn Pieters · Accepted Answer · 2022-08-23 08:54:30Z

9

This can be done in a following way

struct MyView: View {

    @State var name: String

    var body: some View {
        TextField("", text:$name)
    }

    init(n: String) {
        _name = State(initialValue: n)
    }
}

edited Aug 23, 2022 at 8:54

Martijn Pieters

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answered Apr 14, 2020 at 18:25

Asperi

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5 Comments

Элёржон Кимсанов Over a year ago

@Asperi Why does undescored var name works? And is there more vanilla way of assigning initial value?

Asperi Over a year ago

@ЭлёржонКимсанов, Swift Property Wrappers

Big_Chair Over a year ago

If anyone is wondering how this works, here someone actually explained this answer instead of code only: stackoverflow.com/a/61398097/1972372

user4150758 Over a year ago

this is interesting, any particular reason why should we use property wrappers to initialize? I mean wouldn't view updates as soon as the value is assigned in onAppear closure?(that's the whole point of @State)

yo1995 Over a year ago

Please be aware of the view identity implications of calling the state property's initializer. It is never a good idea to call it when the input is a variable.

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