passepartout-apple/Passepartout/Library/Sources/CommonUtils/Views/OnLoadModifier.swift

//
//  OnLoadModifier.swift
//  Passepartout
//
//  Created by Davide De Rosa on 2/24/24.
//  Copyright (c) 2024 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of Passepartout.
//
//  Passepartout is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  Passepartout is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
//

import SwiftUI

public struct OnLoadModifier: ViewModifier {
    public let onLoad: () -> Void

    @State
    private var didAppear = false

    public init(onLoad: @escaping () -> Void) {
        self.onLoad = onLoad
    }

    public func body(content: Content) -> some View {
        content
            .onAppear {
                guard !didAppear else {
                    return
                }
                didAppear = true
                onLoad()
            }
    }
}

extension View {
    public func onLoad(perform: @escaping () -> Void) -> some View {
        modifier(OnLoadModifier(onLoad: perform))
    }
}