SnapKit 中的 .offset 和 .inset 有什么区别？

简而言之，对于顶部和左侧边框，偏移和插入给出相同的结果，而对于右侧和底部 - 相反。这意味着，例如，如果视图 1 的左边界附加到视图 2 的右边界，则正偏移量会将视图 2 向右移动，并向左插入，如果一个视图在另一个视图内，那么结果也会有所不同。

一般来说，如果您牢记这些细微差别并调整值，这些方法是可以互换的

查看文档中的示例

let box = UIView()
superview.addSubview(box)

box.snp.makeConstraints { (make) -> Void in
    make.top.equalTo(superview).offset(20)
    make.left.equalTo(superview).offset(20)
    make.bottom.equalTo(superview).offset(-20)
    make.right.equalTo(superview).offset(-20)
}

一样

box.snp.makeConstraints { (make) -> Void in
    make.edges.equalTo(superview).inset(UIEdgeInsetsMake(20, 20, 20, 20))
}

这是另一个例子来说明

import UIKit
import SnapKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let greenBox = UIView()
        self.view.addSubview(greenBox)
        greenBox.backgroundColor = .green
        greenBox.snp.makeConstraints { (make) in
           make.width.height.equalTo(50)
           make.center.equalTo(self.view)
        }

        // offset to green

        let redBox = UIView()
        self.view.addSubview(redBox)
        redBox.backgroundColor = .red
        redBox.snp.makeConstraints { (make) in
            make.width.height.equalTo(50)
            make.leading.equalTo(greenBox.snp.trailing).offset(20)
            make.top.equalTo(greenBox.snp.bottom)
        }

        // inset to green

        let blueBox = UIView()
        self.view.addSubview(blueBox)
        blueBox.backgroundColor = .blue
        blueBox.snp.makeConstraints { (make) in
            make.width.height.equalTo(50)
            make.leading.equalTo(greenBox.snp.trailing).inset(20)
            make.top.equalTo(redBox.snp.bottom)
        }

        // offset black inside yellow

        let yellowBox = UIView()
        self.view.addSubview(yellowBox)
        yellowBox.backgroundColor = .yellow
        yellowBox.snp.makeConstraints { (make) in
            make.width.height.equalTo(50)
            make.leading.equalTo(greenBox.snp.trailing)
            make.top.equalTo(blueBox.snp.bottom)
        }

        let blackBox = UIView()
        yellowBox.addSubview(blackBox)
        blackBox.backgroundColor = .black
        blackBox.snp.makeConstraints { (make) in
            make.edges.equalTo(yellowBox).offset(10)
        }

        // inset purple inside gray

        let grayBox = UIView()
        self.view.addSubview(grayBox)
        grayBox.backgroundColor = .gray
        grayBox.snp.makeConstraints { (make) in
            make.width.height.equalTo(50)
            make.leading.equalTo(greenBox.snp.trailing)
            make.top.equalTo(yellowBox.snp.bottom)
        }

        let purpleBox = UIView()
        grayBox.addSubview(purpleBox)
        purpleBox.backgroundColor = .purple
        purpleBox.snp.makeConstraints { (make) in
            make.edges.equalTo(grayBox).inset(10)
        }

    }

}