SnapKit 을 이용하여 Dynamic Height ScollView 를 만드는 법

import UIKit
import SnapKit

class ViewController: UIViewController {
    
    let scrollView = UIScrollView()
    let contentView = UIView()
    
    let view1 = UIView()
    let view2 = UIView()
    let view3 = UIView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.view.addSubview(scrollView) // 메인뷰에
        
        scrollView.snp.makeConstraints { (make) in
            make.edges.equalToSuperview() // 스크롤뷰가 표현될 영역
        }
        
        scrollView.addSubview(contentView)
        
        contentView.snp.makeConstraints { (make) in
            make.width.equalToSuperview()
            make.centerX.top.bottom.equalToSuperview()
        }
        
        _ = [view1, view2, view3].map { self.contentView.addSubview($0)}
        
        view1.backgroundColor = .red
        view2.backgroundColor = .black
        view3.backgroundColor = .blue
        
        
        view1.snp.makeConstraints { (make) in
            
            make.leading.top.trailing.equalToSuperview()
            make.height.equalTo(300)
        }
        
        view2.snp.makeConstraints { (make) in
            
            make.top.equalTo(view1.snp.bottom)
            make.leading.trailing.equalToSuperview()
            make.height.equalTo(300)
        }
        
        view3.snp.makeConstraints { (make) in
            
            make.top.equalTo(view2.snp.bottom)
            make.leading.trailing.equalToSuperview()
            make.height.equalTo(300)
            make.bottom.equalToSuperview() // 이것이 중요함
        }
    }
    
}