What is the type of a constant that is being implemented into a custom modifier?

Question

Created Jan ’21

Replies 1

Boosts 0

Participants 2

Hi there,

I'm developing an app that uses custom view modifiers using struct View: ViewModifier {} and extension {} but am having issues when it comes to using the below extension:

Code Block extension View {
    func settingsIconViewWithSFSymbols(with icon: <#unknownType#>) -> some View {
        self.modifier(settingsIconImageStyleUsingSFSymbols(icon: icons[0]))
    }
}

In that code block just after the with icon text, I'm unsure what type it is. Here's the full block of code, so you can have a look at what I mean.

Code Block import SwiftUI
struct settingsIconImageStyleUsingSFSymbols: ViewModifier {
    let icon: rowAndIconView
    func body(content: Content) -> some View {
        Image(icon.systemImageName)
            .resizable()
            .aspectRatio(contentMode: .fit)
            .frame(width: 35, height: 35)
            .padding(7)
            .foregroundColor(icon.foregroundColorOfImage)
            .background(icon.backgroundColorOfImage)
            .cornerRadius(10)
            .padding(5)
    }
}
extension View {
    func settingsIconViewWithSFSymbols(with icon: <#Unknown Type#>) -> some View {
self.modifier(settingsIconImageStyleUsingSFSymbols(icon: icons[0]))
    }
}

Code Block struct rowAndIconView: Identifiable {
    let id = UUID()
    let systemImageName: String
    let text: String
    let foregroundColorOfImage: Color
    let backgroundColorOfImage: Color
}

I'd really appreciate it if someone could please tell me what type the constant

Code Block icon

is. I just can't seem to figure it out.

Thanks!

Grey360

Boost

Answer 1

OOPer OP

Jan ’21

In Swift, type names should start with Capital letter.
If you have some reason that you cannot follow the basic coding rule of Swift, please re-interpret the following description.

You declare icon in your SettingsIconImageStyleUsingSFSymbols as a concrete struct type RowAndIconView.
Then there is no choice other than you declare it as RowAndIconView:

Code Block import SwiftUI
struct SettingsIconImageStyleUsingSFSymbols: ViewModifier {
    let icon: RowAndIconView
    func body(content: Content) -> some View {
        Image(icon.systemImageName)
            .resizable()
            .aspectRatio(contentMode: .fit)
            .frame(width: 35, height: 35)
            .padding(7)
            .foregroundColor(icon.foregroundColorOfImage)
            .background(icon.backgroundColorOfImage)
            .cornerRadius(10)
            .padding(5)
    }
}
extension View {
    func settingsIconViewWithSFSymbols(with icons: [RowAndIconView]) -> some View {
self.modifier(SettingsIconImageStyleUsingSFSymbols(icon: icons[0]))
    }
}
//Or
extension View {
    func settingsIconViewWithSFSymbols(with icon: RowAndIconView) -> some View {
self.modifier(SettingsIconImageStyleUsingSFSymbols(icon: icon))
    }
}

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