iOS简化 Auto Layout Guide 方法.swift

import UIKit

extension UIView {
    /// UIView 添加 Auto Layout
    @objc func layout(_ constraints: [NSLayoutConstraint]) {
        translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate(constraints)
    }

    /// 简单的边缘对齐superView
    @objc func pinEdgesToSuperview() {
        guard let superview = superview else {
            fatalError("请先添加到superview")
        }
        
        layout([
            leftAnchor.constraint(equalTo: superview.leftAnchor),
            rightAnchor.constraint(equalTo: superview.rightAnchor),
            topAnchor.constraint(equalTo: superview.topAnchor),
            bottomAnchor.constraint(equalTo: superview.bottomAnchor),
        ])
    }
}


extension NSLayoutConstraint {
    @objc func offset(_ constant: CGFloat) -> NSLayoutConstraint {
        self.constant = constant
        return self
    }
    
    func priority(_ p: UILayoutPriority) -> NSLayoutConstraint {
        self.priority = p
        return self
    }
}

/// 用于 top bottom leading trailing
extension NSLayoutAnchor {
    
    @objc func equalTo(_ anchor: NSLayoutAnchor) -> NSLayoutConstraint {
        constraint(equalTo: anchor)
    }
    
    @objc func greaterThanOrEqualTo(_ anchor: NSLayoutAnchor) -> NSLayoutConstraint {
        constraint(greaterThanOrEqualTo: anchor)
    }
    
    @objc func lessThanOrEqualTo(_ anchor: NSLayoutAnchor) -> NSLayoutConstraint {
        constraint(lessThanOrEqualTo: anchor)
    }
    
}

/// 用于 width 和 height
extension NSLayoutDimension {
    
    @objc func equal(_ constant: CGFloat) -> NSLayoutConstraint {
        constraint(equalToConstant: constant)
    }

    @objc func greaterThanOrEqual(_ constant: CGFloat) -> NSLayoutConstraint {
        constraint(greaterThanOrEqualToConstant: constant)
    }

    @objc func lessThanOrEqual(_ constant: CGFloat) -> NSLayoutConstraint {
        constraint(lessThanOrEqualToConstant: constant)
    }
}