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  • 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
    
    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( 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( UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.width))
                }else{
                    make.size.equalTo(CGSize( 100, height: 100))
                }
            }
            
            //更新原有的不会添加
            snapkitV.snp.updateConstraints { (make) in
                if isUpdateSnapkitV{
                    make.size.equalTo(CGSize( UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.width))
                }else{
                    make.size.equalTo(CGSize( 100, height: 100))
                }
            }
            
            //最后一步在调用
            super.updateViewConstraints()
        }
    }
    
    extension ViewController{

    ///第一种更新动画方法 推荐 https://www.cnblogs.com/qingzZ/p/14005859.html


    ///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 } } }

      

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  • 原文地址:https://www.cnblogs.com/qingzZ/p/11132252.html
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