swift -SnapKit一些基本使用

 

参考：SnapKit - 修改约束

https://blog.csdn.net/longshihua/article/details/80289061

 import SnapKit

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<em> class ViewController: UIViewController {           private var isUpdateSnapkitV  = false           private lazy var snapkitV : UIView = {         let snapkitV = UIView()         snapkitV.backgroundColor = UIColor.red         return snapkitV     }()           override func viewDidLoad() {         super.viewDidLoad()                   self.view.addSubview(snapkitV)         snapkitV.addGestureRecognizer(UITapGestureRecognizer.init(target: self, action: #selector(reloadView)))         snapkitV.snp.makeConstraints { (make) in             make.size.equalTo(CGSize(width: 100, height: 100))             make.centerX.centerY.equalTo(view)         }     }                 override func updateViewConstraints() {                   //移除原有的重新添加         snapkitV.snp.remakeConstraints { (make) in             if isUpdateSnapkitV{                 make.size.equalTo(CGSize(width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.width))             }else{                 make.size.equalTo(CGSize(width: 100, height: 100))             }         }                   //更新原有的不会添加         snapkitV.snp.updateConstraints { (make) in             if isUpdateSnapkitV{                 make.size.equalTo(CGSize(width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.width))             }else{                 make.size.equalTo(CGSize(width: 100, height: 100))             }         }                   //最后一步在调用         super.updateViewConstraints()     } }   extension ViewController{<br><br>///第一种更新动画方法 推荐 https://www.cnblogs.com/qingzZ/p/14005859.html<br><br><br>///第二种动画方法 不推荐     @objc private func reloadView(){         isUpdateSnapkitV.toggle()         self.view.setNeedsUpdateConstraints() //标记为需要更新约束         self.view.updateConstraintsIfNeeded()//立即调用updateViewConstraints更新约束, 此方法只是更新了约束, 并没有刷新布局         UIView.animate(withDuration: 1.0) {             self.view.layoutIfNeeded()//动画 刷新布局         }     } }<br><br><br>设置内边距inset<br></em><em id="__mceDel"> </em>

        bgView.snp.remakeConstraints { make in

            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 0, left: 16, bottom: 16, right: 16)).priority(.high);

        }