how to declare a variable that will later be defined as a SwiftUI view?

Question

mikeTheDad OP

Created May ’20

Replies 2

Boosts 0

Views 1.2k

Participants 2

I can refactor, to avoid having to do this, but what can I use as the var type in the snippet below:

var mySwiftUIView: __________?
if shouldUseFancyView() {
    mySwiftUIView = FancyView(param: paramValue)
} else {
    mySwiftUIView = PlainView(param: otherParamValue)
}
let hostingView = NSHostingView(rootView: mySwiftUIView)

In the API, NSHostingView's rootView appears to be of type Content, but it's not clear to me what Content refers to.

thanks in advance,

Mike

Answered by OOPer in 422015022

I can refactor, to avoid having to do this

Then you should better refactor.

But if you really need it, you can write something like this.

        var mySwiftUIView: AnyView
        if shouldUseFancyView() {
            mySwiftUIView = AnyView(FancyView(param: paramValue))
        } else {
            mySwiftUIView = AnyView(PlainView(param: otherParamValue))
        }
        let hostingView = NSHostingView(rootView: mySwiftUIView)

Your second case:

        var hostingView: NSView
        if shouldUseFancyView() {
            hostingView = NSHostingView(rootView: FancyView(param: paramValue))
        } else {
            hostingView = NSHostingView(rootView: PlainView(param: otherParamValue))
        }

Boost

Answer 1

mikeTheDad OP

May ’20

alternatively/additionally, if I instead want to declare a hostingView var, what type would it use?

var hostingView: NSHostingView<_____: _____>?

if shouldUseFancyView() {

hostingView = NSHostingView(rootView: FancyView(param: paramValue))

} else {

hostingView = NSHostingView(rootView: mySwiftUIView = PlainView(param: otherParamValue))

}

0

Answer 2

OOPer OP

May ’20

Accepted Answer

I can refactor, to avoid having to do this

Then you should better refactor.

But if you really need it, you can write something like this.

        var mySwiftUIView: AnyView
        if shouldUseFancyView() {
            mySwiftUIView = AnyView(FancyView(param: paramValue))
        } else {
            mySwiftUIView = AnyView(PlainView(param: otherParamValue))
        }
        let hostingView = NSHostingView(rootView: mySwiftUIView)

Your second case:

        var hostingView: NSView
        if shouldUseFancyView() {
            hostingView = NSHostingView(rootView: FancyView(param: paramValue))
        } else {
            hostingView = NSHostingView(rootView: PlainView(param: otherParamValue))
        }

0