UIStackView demo

potatotips45.swift

// スライドはこちら https://www.slideshare.net/kirimotch/uistackviewui-82938602

// MARK: - ViewController.swift
import UIKit
import SnapKit

class ViewController: UIViewController
{
    private let colors: [UIColor] = [.red, .blue, .green, .yellow, .orange, .cyan, .magenta]

    override func loadView() {
        super.loadView()
        view.backgroundColor = .white

        let scrollView = UIScrollView().apply { this in
            view.addSubview(this)
            this.isPagingEnabled = true
            this.snp.makeConstraints { make in
                make.top.equalToSuperview().inset(100)
                make.left.right.equalToSuperview()
                make.height.equalTo(this.snp.width).multipliedBy(0.5)
            }
        }

        let stackView = UIStackView().apply { this in
            scrollView.addSubview(this)
            this.snp.makeConstraints { make in
                make.edges.height.equalToSuperview()
            }
        }

        colors.forEach { color in
            let _ = UIView().apply { this in
                stackView.addArrangedSubview(this)
                this.backgroundColor = color
                this.snp.makeConstraints { make in
                    make.width.equalTo(scrollView.snp.width)
                }
            }
        }
    }
}


// MARK: - Extension.swift
import Foundation

protocol ApplyProtocol {}

extension ApplyProtocol {
    func apply(_ closure: (_ this: Self) -> Void) -> Self {
        closure(self)
        return self
    }
}

extension NSObject: ApplyProtocol {}