Auto Layout in Swift: Writing constraints programmatically (Code Base UI)

[chaneeii]

• https://babbab2.tistory.com/155
• https://macgongmon.club/31
• https://sihyungyou.github.io/iOS-auto-layout-programmatically/
• https://www.avanderlee.com/swift/auto-layout-programmatically/
• https://www.joshqn.com/getting-started-with-nslayoutanchor-swift-4/
• https://velog.io/@wonhee010/Code%EB%A1%9C-AutoLayout%EC%9D%84-%EC%A4%98%EB%B3%B4%EC%9E%90

[chaneeii]

Questions

• 왜 private let으로 view를 선언해주는가

private let titleImageView: UIImageView = {
        let imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.image = UIImage(named: "login_title_icon")
        imageView.contentMode = .scaleAspectFit
        return imageView
}()

• NSLayoutConstraint.activate 을 사용하는 이유

NSLayoutConstraint.activate([
            self.container.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 50),
            self.container.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -50),
            self.container.centerYAnchor.constraint(equalTo: self.view.centerYAnchor)
])

• addArrangedSubview 를 사용하는 이유

 self.container.addArrangedSubview(self.titleImageView) // 컨테이너가 스택뷰이기때문