How to wrap a custom UIView for SwiftUI
Updated for Xcode 12.0
Although SwiftUI does a good job of providing many of UIKit’s UIView subclasses, it doesn’t have them all yet at this time. Fortunately, it’s not hard to create custom wrappers for a UIView that you want.
As an example, let’s create a simple SwiftUI wrapper for UITextView. This takes four steps:
- Creating a struct that conforms to
UIViewRepresentable. - Defining one property that stores the text string we are working with.
- Giving it a
makeUIView()method that will return our text view. - Adding a
updateUIView()method that will be called whenever the data for the text view has changed.
In code we end up with this:
struct TextView: UIViewRepresentable {
@Binding var text: String
func makeUIView(context: Context) -> UITextView {
return UITextView()
}
func updateUIView(_ uiView: UITextView, context: Context) {
uiView.text = text
}
}And that’s it! You can now immediately use the TextView component in SwiftUI views, such as this one:
struct ContentView : View {
@State var text = ""
var body: some View {
TextView(text: $text)
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
}
}
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