UIScrollView+UIStackView

stackView作为ScrollView的滚动内容，arrangedSubview的最右边因为填充边缘的，进而来确定滚动范围

         let scrollview = UIScrollView()
         view.addSubview(scrollview)
         scrollview.translatesAutoresizingMaskIntoConstraints = false
         scrollview.topAnchor.constraint(equalTo: view.topAnchor, constant: 100).isActive = true
         scrollview.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
         scrollview.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
         scrollview.heightAnchor.constraint(equalToConstant: 200).isActive = true
         scrollview.backgroundColor = .red
        
         let stackview = UIStackView()
         stackview.spacing = 20;
         scrollview.addSubview(stackview)
         stackview.translatesAutoresizingMaskIntoConstraints = false
         stackview.trailingAnchor.constraint(equalTo: scrollview.trailingAnchor).isActive = true
         stackview.topAnchor.constraint(equalTo: scrollview.topAnchor).isActive = true
         stackview.leadingAnchor.constraint(equalTo: scrollview.leadingAnchor).isActive = true
        
        for _ in 0 ... 5 {
            let view = UIView()
            view.backgroundColor = .green
            stackview .addArrangedSubview(view)
            view.translatesAutoresizingMaskIntoConstraints = false
            view.widthAnchor.constraint(equalToConstant: 100).isActive = true
            view.heightAnchor.constraint(equalToConstant: 100).isActive = true
        }

• configureScrollview

- (void)configureScrollView:(UIScrollView *)scrollView AddArrangedSubview: (void(^)( UIStackView *stackView))block  {
    UIStackView *stackView =[[UIStackView alloc]init];
    [scrollView addSubview:stackView];
    stackView.backgroundColor =[UIColor yellowColor];
    [stackView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(scrollView);
        make.height.equalTo(scrollView.mas_height);
    }];
    block(stackView);
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    UIScrollView *scrollView =[[UIScrollView alloc]init];
    [self.view addSubview:scrollView];
    [scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.top.offset(100);
        make.right.offset(-100);
        make.height.mas_equalTo(300);
    }];
    scrollView.backgroundColor =[UIColor redColor];
  
    [self configureScrollView:scrollView AddArrangedSubview:^(UIStackView *stackView) {
        for (int i=0; i<6; i++) {
            UIView *redView =[[UIView alloc]init];
            redView.backgroundColor = [UIColor grayColor];
            [stackView addArrangedSubview:redView];
            stackView.spacing =20;
            [redView mas_makeConstraints:^(MASConstraintMaker *make) {
                make.width.mas_equalTo(@200);
            }];
        }
    }];
}