How can I define default empty input content for a function in SwiftUI?

Question

I have a customContentViewFunction() that I like give an empty content like {} or EmptyView as default to it, which I do not have to do it in use case, for example I done same thing for color!

    struct ContentView: View {
    var body: some View {

        
        customContentViewFunction(content: Text("hello"), color: .green)
        
       // customContentViewFunction() : << Like this one!
        
    }
    
    
    func customContentViewFunction<Content: View>(content: Content, color: Color = Color.red) -> some View {

        ZStack {
            
            Rectangle()
                .fill(color)
 
             content

        }

    }
  
 
}

jnpdx · Accepted Answer · 2021-02-10 03:06:45Z

1

Define another version/signature of the function where it gets passed EmptyView() for content.

You could either choose to define it with the color property still there, or leave that out and let it get set to the default in the original signature.

struct ContentView: View {
    var body: some View {
        customContentViewFunction()
    }
    
    func customContentViewFunction(color: Color = Color.red) -> some View {
        return customContentViewFunction(content: EmptyView(), color: color)
    }
    
    func customContentViewFunction<Content: View>(content: Content, color: Color = Color.red) -> some View {
        ZStack {
            Rectangle()
                .fill(color)
            content
        }
    }
}

answered Feb 10, 2021 at 3:06

jnpdx

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2 Comments

swiftPunk Over a year ago

Since we have no initializer for any functions at all I mean in general case of func, in this kind of situations should we always define multiple functions to get the flexibility?

jnpdx Over a year ago

Just looking at the heads for lots of Apple's Swift code, you can see there are often multiple signatures for functions for flexibility.

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