第六天:SwiftPopUPAndFadeOut

参考链接:https://www.jianshu.com/p/632fdaede292　　

　　　　　　　　　　　　　　　　　　　　　　　　

import UIKit

// 先写两个屏幕宽高的宏定义
let kScreenWidth = UIScreen.main.bounds.size.width
let kScreenHeight = UIScreen.main.bounds.size.height

class ViewController: UIViewController {

    // 定义三个属性
    // 背景View
    // 弹出View
    // 弹出View 的 Label
    var bkgView: UIView!
    var popView: UIView!
    var popLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        setupUI()
    }
    
    
    // 配置 UI 方法 func setupUI() { }
    func setupUI() {
        // self.view 的颜色
        self.view.backgroundColor = UIColor.cyan
        
        // 创建 弹出 Button
        let popBtn = UIButton()
        popBtn.frame.size = CGSize(width: 100.0, height: 100.0)
        popBtn.center = self.view.center
        popBtn.layer.cornerRadius = 50.0
        popBtn.backgroundColor = UIColor.green
        popBtn.setTitle("PopUP", for: .normal)
        
        popBtn.addTarget(self, action: #selector(popUpAction), for: .touchUpInside)
        
        self.view.addSubview(popBtn)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

// 延展
extension ViewController {
    @objc func popUpAction() {
        
        guard let windows = UIApplication.shared.keyWindow else {
            return
        }
        
        bkgView = UIView()
        bkgView.frame = windows.bounds
        bkgView.backgroundColor = UIColor (white: 0.3, alpha: 0.6)
        windows.addSubview(bkgView)
        
        popView = UIView()
        popView.frame = CGRect(x: 30.0, y: kScreenHeight, width: kScreenWidth - 60.0, height: 30.0)
        popView.backgroundColor = UIColor.orange
        popView.layer.cornerRadius = 15.0
        windows.addSubview(popView)
        
        UIView.animate(withDuration: 0.3) {
            self.popView.frame = CGRect(x: 30.0, y: (kScreenHeight - 30) / 2.0, width: kScreenWidth - 60.0, height: 30.0)
        }
        
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(hideView))
        bkgView.addGestureRecognizer(tapGesture)
    }
    
    @objc func hideView() {
        UIView.animate(withDuration: 0.3) {
            self.popView.frame = CGRect(x: 30.0, y: kScreenHeight, width: kScreenWidth - 60.0, height: 30.0)
            
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.3, execute: {
                self.popView.removeFromSuperview()
                self.bkgView.removeFromSuperview()
            })
        }
    }
    
}