CampusAssistantApp/CampusAssistant/LoadingView.swift

//
//  LoadingView.swift
//  Fei
//
//  Created by mcvivi on 2022/3/31.
//

import UIKit
import APNGKit

extension UIWindow
{
    class var window:UIWindow{
        let window = UIApplication.shared.connectedScenes
            .map({ $0 as? UIWindowScene })
            .compactMap({ $0 })
            .first?.windows.first
        if(!window!.isHidden){
            return window!;
        }
        return (UIApplication.shared.delegate?.window!)!;
    }
}

extension LoadingView{
    class func show(){
        let window = UIWindow.window
        shared.loadingView.center = window.center
        window.addSubview(shared.loadingViewBackground)
        shared.label.text = "加载中..."
        shared.loadingViewBackground.alpha = 0
        shared.loadingViewBackground.addSubview(shared.loadingView)
        shared.loadingView.addSubview(shared.imageView)
        shared.loadingView.addSubview(shared.label)
        UIView.animate(withDuration: 0.3) {
            shared.loadingViewBackground.alpha = 1
        }
    }
    
    class func complete(){
        DispatchQueue.main.asyncAfter(deadline: .now()+1, execute:
                                        {
            UIView.animate(withDuration: 0.3) {
                shared.loadingViewBackground.alpha = 0
            } completion: { (bool) in
                shared.loadingViewBackground.removeFromSuperview()
            }
                                        })
    }
    
}


class LoadingView: NSObject {
    fileprivate static let shared:LoadingView = LoadingView()
    
    static var width = 400.0
    static var height = 700.0
    
    var loadingViewBackground:UIView = {
        let loadingViewBackground = UIView(frame: CGRect.init(x: 0, y: 0, width: width, height: height))
        loadingViewBackground.backgroundColor = .white
        return loadingViewBackground
    }()
    
    var loadingView:UIView = {
        let loadingViewSideLength = 109*LoadingView.width/375
        let loadingViewXDistance = (LoadingView.width-loadingViewSideLength)/2
        let loadingViewYDistance = (LoadingView.height-loadingViewSideLength)/2
        let loadingView = UIView(frame: CGRect.init(x: loadingViewXDistance, y: loadingViewYDistance, width: loadingViewSideLength, height: loadingViewSideLength))
        loadingView.backgroundColor = .black
        loadingView.layer.opacity = 0.65
        loadingView.layer.cornerRadius = 12
        return loadingView
    }()
    
    var label:UILabel = {
        let loadingLabelWidth = 52.5*LoadingView.width/375
        let loadingLabelHeight = 12.5*LoadingView.width/375
        let loadingLabelXDistance = 30.5*LoadingView.width/375
        let loadingLabelYDistance = 66.5*LoadingView.width/375
        let loadingLabel = UILabel(frame: CGRect(x: loadingLabelXDistance, y: loadingLabelYDistance, width: loadingLabelWidth, height: loadingLabelHeight))
        loadingLabel.text = "加载中..."
        loadingLabel.textColor = .white
        loadingLabel.font = UIFont.init(name: "PingFang-SC-Medium", size: 13*LoadingView.width/375)
        return loadingLabel
    }()
    
    var imageView:APNGImageView = {
        do {
            let loadingImageSideLength = 28*LoadingView.width/375
            let loadingImageXDistance = 40.5*LoadingView.width/375
            let loadingImageYDistance = 30.5*LoadingView.width/375
            let image = try APNGImage(named: "jz_00_iSpt")
            let loadingViewImageView = APNGImageView(image: image)
            loadingViewImageView.frame = CGRect(x: loadingImageXDistance, y: loadingImageYDistance, width: loadingImageSideLength, height: loadingImageSideLength)
            return loadingViewImageView
        }catch {
            
        }
        return APNGImageView.init(frame: CGRect.init(x: 0.0, y: 0.0, width: 0.0, height: 0.0))
    }()
    
}