WebView & WKWebView & UIWebView

WebView

WKWebView

https://developer.apple.com/documentation/webkit/wkwebview

UIWebView

https://developer.apple.com/documentation/uikit/uiwebview

https://www.hackingwithswift.com/example-code/wkwebview/whats-the-difference-between-uiwebview-and-wkwebview

https://forums.expo.io/t/received-mail-from-apple-about-the-deprecated-api-uiwebview/27117/15

https://developer.apple.com/documentation/webkit/wkwebview

import UIKit
import WebKit
class ViewController: UIViewController, WKUIDelegate {
    
    var webView: WKWebView!
    
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let myURL = URL(string:"https://www.apple.com")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
    }
}

//: A UIKit based Playground for presenting user interface


// PlaygroundSupport
import PlaygroundSupport

import UIKit
import WebKit
class ViewController: UIViewController, WKUIDelegate {
    
    var webView: WKWebView!
    
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let myURL = URL(string: "https://cdn.xgqfrms.xyz")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
    }
}

PlaygroundPage.current.liveView = ViewController();

/*
  
import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white

        let label = UILabel()
        label.frame = CGRect(x: 150, y: 200, width: 200, height: 20)
        label.text = "Hello World!"
        label.textColor = .black
        
        view.addSubview(label)
        self.view = view
    }
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()

*/

JsBridge

原生開發可以訪問平台所有功能，而混合開發中，H5 代碼是運行在 WebView 中，
而 WebView 實質上就是一個瀏覽器內核，其 JavaScript 依然運行在一個權限受限的沙箱中，
所以對於大多數系統能力都沒有訪問權限，如無法訪問文件系統、不能使用藍牙等。

所以，對於 H5 不能實現的功能，都需要原生去做。
而混合框架一般都會在原生代碼中預先實現一些訪問系統能力的 API， 然后暴露給 WebView 以供 JavaScript調用;
這樣一來，WebView 就成為了 JavaScript與原生 API之間通信的橋梁，主要負責 JavaScript與原生之間傳遞調用消息;
而消息的傳遞必須遵守一個標准的協議，它規定了消息的格式與含義;
我們把依賴於 WebView的用於在 JavaScript與原生之間通信並實現了某種消息傳輸協議的工具稱之為 WebView JavaScript Bridge, 簡稱 JsBridge，它也是混合開發框架的核心。

WebView Scheme / URL Scheme

https://book.flutterchina.club/chapter1/mobile_development_intro.html

refs

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