[240125] Today I Learned

AutoLayout

구성

1. Constraints 제약조건

• 뷰의 크기, (상대적) 위치를 정의하는 규칙
• 주로 Interface Builder 또는 코드로 설정됨

2. Autoresizing Masks

• Autoresizing masks는 iOS 6 이전에 사용된 레이아웃 시스템
• Constraints를 사용하여 레이아웃을 구성하는 것이 더 강력하고 유연한 방법
• translatesAutoresizingMaskIntoConstraints = false를 해줘야함

기본적인 Constraints 속성

1. Left/Right (Leading, Trailing)
   view.leftAnchor.constraints(equalTo: superview.leftAnchor, constant: 20).isActive = true
2. Top/Bottom
   view.topAnchor.constraint(equalTo: superview.topAnchor, constant: 20).isActive = true
3. Width/Height
   view.widthAnchor.constraint(equalToConstant: 100).isActive = true
4. CenterX/CenterY
   view.centerXAnchor.constraint(equalTo: superview.centerXAnchor).isActive = true
5. Safe Area
   view.topAnchor.constraint(equalTo: view.superview.safeAreaLayoutGuide.topAnchor).isActive = true
6. Multiplier
   view1.widthAnchor.constraint(equalTo: view2.widAnchor, multiplier: 0.5).isActive = true
7. Priority
   view.widthAnchor.constraint(equalTo: superview.widthAnchor, constant: 20).priority = .required
8. Aspect Ratio
   view.widthAnchor.constraint(equalTo: view.heightAnchor, multiplier: 2).isActive = true
9. Activation/Deactivation
   constraint.isActive = false