How to place UIStackView in UIScrollView

HomeViewController.m

//
//  HomeViewController.m
//  MYPROJECT
//
//  Created by Marc Tarnutzer on 18.03.20.
//  Copyright © 2020 Marc Tarnutzer. All rights reserved.
//

#import "HomeViewController.h"

@interface HomeViewController ()

@end

@implementation HomeViewController {
    UIScrollView *scrollView;
    UISearchController *searchController;
    UIStackView *stackView;
    UIView *testView;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    printf("HomeViewController didLoad\n");
    
    self.navigationItem.title = @"Home";
    
    // Scroll view setup
    scrollView = [[UIScrollView alloc] init];
    scrollView.alwaysBounceVertical = YES;
    scrollView.backgroundColor = [UIColor systemBackgroundColor];
    scrollView.translatesAutoresizingMaskIntoConstraints = false;
    [self.view addSubview:scrollView];
    
    [scrollView.topAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.topAnchor constant:0].active = YES;
    [scrollView.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor constant:0].active = YES;
    [scrollView.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor constant:0].active = YES;
    [scrollView.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor constant:0].active = YES;
    
    // Search controller setup
    searchController = [[UISearchController alloc] init];
    searchController.searchBar.placeholder = @"Search";
    self.navigationItem.hidesSearchBarWhenScrolling = YES;
    self.navigationItem.searchController = searchController;
    
    // Stackview
    stackView = [[UIStackView alloc] init];
    stackView.backgroundColor = [UIColor greenColor];
    [stackView setAxis:UILayoutConstraintAxisVertical];
    [stackView setAlignment:UIStackViewAlignmentFill];
    [stackView setDistribution:UIStackViewDistributionEqualSpacing];
    [stackView setSpacing:0];
    stackView.translatesAutoresizingMaskIntoConstraints = false;
    [scrollView addSubview:stackView];
    
    [stackView.topAnchor constraintEqualToAnchor:scrollView.topAnchor constant:0].active = YES;
    [stackView.leadingAnchor constraintEqualToAnchor:scrollView.leadingAnchor constant:0].active = YES;
    [stackView.trailingAnchor constraintEqualToAnchor:scrollView.trailingAnchor constant:0].active = YES;
    [stackView.bottomAnchor constraintEqualToAnchor:scrollView.bottomAnchor constant:0].active = YES;
    [stackView.widthAnchor constraintEqualToAnchor:scrollView.widthAnchor multiplier:1].active = YES;
    [stackView.widthAnchor constraintEqualToAnchor:self.view.widthAnchor constant:0].active = YES;
    
    // Test view inside of stackview
    testView = [[UIView alloc] init];
    testView.backgroundColor = [UIColor systemBackgroundColor];
    [stackView addArrangedSubview:testView];
    
    [testView.heightAnchor constraintEqualToConstant:200].active = YES;
}

@end