SwiftUI: Changing Button Text based on some external event

Question

Created Oct ’20

Replies 4

Boosts 0

Views 7.9k

Participants 4

I am a newbie to SwiftUI. I have a button with some text. I want to change the text of that button when some external event happens. For example take the string typed in a Text Box and show that as text in the button.
Please share a way to do this. Thanks

Answered by OmerFlame in 642490022

Here's how to make the example you proposed:

Code Block swiftimport SwiftUI
struct ContentView: View {
	@State var buttonText = ""
	var body: some View {
		VStack {
			TextField("Text Here", text: $buttonText)
				.padding()
				.textFieldStyle(RoundedBorderTextFieldStyle())
			
			Button(self.buttonText) {
				/* code to be executed when button is pressed */
			}
		}
	}
}

I suggest that you read about the @State property wrapper and how SwiftUI Views work in general.

In short, SwiftUI is a state-driven UI framework, meaning that every variable which is somehow displayed on screen that you change at some point in time will immediate refresh the view with the new data. It makes updating things and listening to changes an absolute breeze.

I hope I helped!

Boost

Answer 1

OOPer OP

Oct ’20

Declare an @State variable and use it as the label text of the Button.

Code Block import SwiftUI
struct ContentView: View {
    @State var buttonTitle: String = ""
    var body: some View {
        VStack {
            TextField("Input text:", text: $buttonTitle)
            Button(buttonTitle) {
                print("\(buttonTitle) pressed")
            }
        }
    }
}

0

Answer 2

OmerFlame OP

Oct ’20

Accepted Answer

Here's how to make the example you proposed:

Code Block swiftimport SwiftUI
struct ContentView: View {
	@State var buttonText = ""
	var body: some View {
		VStack {
			TextField("Text Here", text: $buttonText)
				.padding()
				.textFieldStyle(RoundedBorderTextFieldStyle())
			
			Button(self.buttonText) {
				/* code to be executed when button is pressed */
			}
		}
	}
}

I suggest that you read about the @State property wrapper and how SwiftUI Views work in general.

In short, SwiftUI is a state-driven UI framework, meaning that every variable which is somehow displayed on screen that you change at some point in time will immediate refresh the view with the new data. It makes updating things and listening to changes an absolute breeze.

I hope I helped!

1

Answer 3

hindermath OP

Mar ’24

Cool, this example code save my day and my app works in the way I have thought thanks to this examples the lead me to the right way!

0

Answer 4

hindermath OP

Mar ’24

My solution looks like this

    @State var counter = 0
    @State var buttonTitle = "Klick mich!"
    var body: some View {
        VStack {
            // other controls
            Button(buttonTitle) {
                counter += 1
                buttonTitle = "\(counter) mal\(counter > 1 ? "e":"") geklickt"
            }
        }

0