NEW: Got a question? Get help on our new forums! >>

How to wrap a custom UIView for SwiftUI

Paul Hudson    @twostraws   

Fully updated for Xcode 11.4

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:

  1. Creating a struct that conforms to UIViewRepresentable.
  2. Defining one property that stores the text string we are working with.
  3. Giving it a makeUIView() method that will return our text view.
  4. 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)
    }
}
Hacking with Swift is sponsored by Instabug

SPONSORED Catch bugs as soon as they happen and know exactly why a crash occurred by integrating Instabug's SDK in one minute. You will automatically receive device data, network logs, and reproduction steps with every bug and crash report.

Learn more and get started for free

Sponsor Hacking with Swift and reach the world's largest Swift community!

Snapthread is a casual video editor and slideshow maker that makes discovering, compiling and sharing your favorite memories effortless.

Similar solutions…

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 3.2/5