SwiftUI View – viewDidLoad()?

We can achieve this using view modifier.

1. Create ViewModifier:

struct ViewDidLoadModifier: ViewModifier {

    @State private var didLoad = false
    private let action: (() -> Void)?

    init(perform action: (() -> Void)? = nil) {
        self.action = action
    }

    func body(content: Content) -> some View {
        content.onAppear {
            if didLoad == false {
                didLoad = true
                action?()
            }
        }
    }

}

2. Create View extension:

extension View {

    func onLoad(perform action: (() -> Void)? = nil) -> some View {
        modifier(ViewDidLoadModifier(perform: action))
    }

}

3. Use like this:

struct SomeView: View {
    var body: some View {
        VStack {
            Text("HELLO!")
        }.onLoad {
            print("onLoad")
        }
    }
}