SwiftUI code snippet example with a Custom View inside in another custom view (InnerContentView => ContentView)

ContentView.swift

//
//  ContentView.swift
//  FlickrImages
//
//  Created by Felipe on 27/03/2020.
//  Copyright © 2020 darkness. All rights reserved.
//

import SwiftUI

struct InnerContentView: View {
    
    var parent: ContentView? = nil
    
    @ObservedObject
    var imgsVm = ImagesViewModel()
    
    @State
    var searchTerm: String = ""
    
    var body: some View {
        
        VStack {
            NavigationView {
                
                ScrollView {
                    
                    SearchBar(text: self.$searchTerm)
                    
                    ImagesRow(collection: self.imgsVm.imgs)
                    
                }.navigationBarTitle(Text("Flickr Images"))
                    .navigationBarItems(trailing: Button(action: {
                        
                        ContentView.loadData(content: self)
                }, label: {
                    Text("Search")
                }))
            
            }
        }.onAppear {

            ContentView.loadData(content: self)
        }
    }
}

struct ContentView: View {
    
    @State
    var showLoadingView: Bool = false
    
    var body: some View {
        
        ActivityIndicatorView(isShowing: .constant(showLoadingView)) {
            
            InnerContentView(parent: self)
        }
    }
    
    /**
        # Load photos data
            
            Request a REST API and return the array data to a @Published variable
     
         # Attention
     
            > **PS:** This method is static to avoid error: `scaping closure captures mutating 'self'`
     
            Because this problem, that method exists, and the method `ImagesViewModel.fetchSearch` is not
            executed in `self.init()`, for example
            
     */
    static func loadData(content: InnerContentView, after afterLoad: (() -> Void)? = nil) {
        
        if content.parent != nil {
            content.parent!.showLoadingView = true;
        }
        
        content.imgsVm.fetchSearch(tags: content.searchTerm) {
            
            if content.parent != nil {
                content.parent!.showLoadingView = false;
            }
            
            if afterLoad != nil {
                afterLoad!()
            }
        }
    }
}

#if DEBUG
struct ContentView_Previews: PreviewProvider {
    
    static var previews: some View {

        ContentView().onAppear()
        
    }
}
#endif