SwiftUI forms: Picker

After TextField and Toggle, another common form control is Picker. It lets us choose an option among a series of possible ones.

First thing we need to do is to have an array with a list of options:

var cities = ["Rome", "Milan", "Venice", "Florence"]

Then we need a property to store the selected choice. We wrap it with @State as that’s something that will change based on the user’s input:

@State private var selected = "Rome"

Finally we use a Picker view. We pass 2 parameters. The first is a label, the second is the property used for the selected item, and in the closure we add a Text view for each different option, using a ForEach view:

Picker("What's your favorite city?", selection: $selected) {
    ForEach(cities, id: \.self) {
        Text($0)
    }
}

Here’s the full code of our ContentView

struct ContentView: View {
    var cities = ["Rome", "Milan", "Venice", "Florence"]

    @State private var selected = "Rome"
    
    var body: some View {
        Form {
            Picker("What's your favorite city?", selection: $selected) {
                ForEach(cities, id: \.self) {
                    Text($0)
                }
            }
        }
    }
}

You can try to run it, and it shows correctly, with the default option visualized:

But even in preview mode, or in the Simulator, you can’t tap it.

Why?

Because you need to wrap it all inside a NavigationView:

struct ContentView: View {
    var cities = ["Rome", "Milan", "Venice", "Florence"]

    @State private var selected = "Rome"
    
    var body: some View {
        NavigationView{
            Form {
                Picker("What's your favorite city?", selection: $selected) {
                    ForEach(cities, id: \.self) {
                        Text($0)
                    }
                }
            }
        }
    }
}

We’ll talk about NavigationView in another post

Now running it again, you can see the label turned black instead of gray:

You can tap it, and you’ll see the options list, with a navigation link to go back:

Tap one, and you’ll see the selected option being visualized instead of the default one:

You can also avoid using an array for the options and use a Text view directly, but you need to use the tag() modifier on each view to identify each option:

struct ContentView: View {
    @State private var selected = "Rome"

    var body: some View {
        NavigationView {
            Form {
                Picker("What's your favorite city?", selection: $selected) {
                    Text("Rome")
                        .tag("Rome")
                    Text("Milan")
                        .tag("Milan")
                    Text("Venice")
                        .tag("Venice")
                    Text("Florence").tag("Florence")
                }
            }
        }
    }
}

Post date September 27, 2021

This content originally appeared on flaviocopes.com and was authored by flaviocopes.com

After TextField and Toggle, another common form control is Picker. It lets us choose an option among a series of possible ones.

First thing we need to do is to have an array with a list of options:

var cities = ["Rome", "Milan", "Venice", "Florence"]

Then we need a property to store the selected choice. We wrap it with @State as that’s something that will change based on the user’s input:

@State private var selected = "Rome"

Picker("What's your favorite city?", selection: $selected) {
    ForEach(cities, id: \.self) {
        Text($0)
    }
}

Here’s the full code of our ContentView

struct ContentView: View {
    var cities = ["Rome", "Milan", "Venice", "Florence"]

    @State private var selected = "Rome"
    
    var body: some View {
        Form {
            Picker("What's your favorite city?", selection: $selected) {
                ForEach(cities, id: \.self) {
                    Text($0)
                }
            }
        }
    }
}

You can try to run it, and it shows correctly, with the default option visualized:

But even in preview mode, or in the Simulator, you can’t tap it.

Why?

Because you need to wrap it all inside a NavigationView:

struct ContentView: View {
    var cities = ["Rome", "Milan", "Venice", "Florence"]

    @State private var selected = "Rome"
    
    var body: some View {
        NavigationView{
            Form {
                Picker("What's your favorite city?", selection: $selected) {
                    ForEach(cities, id: \.self) {
                        Text($0)
                    }
                }
            }
        }
    }
}

We’ll talk about NavigationView in another post

Now running it again, you can see the label turned black instead of gray:

You can tap it, and you’ll see the options list, with a navigation link to go back:

Tap one, and you’ll see the selected option being visualized instead of the default one:

You can also avoid using an array for the options and use a Text view directly, but you need to use the tag() modifier on each view to identify each option:

struct ContentView: View {
    @State private var selected = "Rome"

    var body: some View {
        NavigationView {
            Form {
                Picker("What's your favorite city?", selection: $selected) {
                    Text("Rome")
                        .tag("Rome")
                    Text("Milan")
                        .tag("Milan")
                    Text("Venice")
                        .tag("Venice")
                    Text("Florence").tag("Florence")
                }
            }
        }
    }
}

This content originally appeared on flaviocopes.com and was authored by flaviocopes.com

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