WebView & WKWebView & UIWebView
WebView
WKWebView
https://developer.apple.com/documentation/webkit/wkwebview
UIWebView
https://developer.apple.com/documentation/uikit/uiwebview
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, 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
原生开发可以访问平台所有功能,而混合开发中,H5 代码是运行在 WebView 中,
而 WebView 实质上就是一个浏览器内核,其 JavaScript 依然运行在一个权限受限的沙箱中,
所以对于大多数系统能力都没有访问权限,如无法访问文件系统、不能使用蓝牙等。
所以,对于 H5 不能实现的功能,都需要原生去做。
而混合框架一般都会在原生代码中预先实现一些访问系统能力的 API, 然后暴露给 WebView 以供 JavaScript调用;
这样一来,WebView 就成为了 JavaScript与原生 API之间通信的桥梁,主要负责 JavaScript与原生之间传递调用消息;
而消息的传递必须遵守一个标准的协议,它规定了消息的格式与含义;
我们把依赖于 WebView的用于在 JavaScript与原生之间通信并实现了某种消息传输协议的工具称之为 WebView JavaScript Bridge, 简称 JsBridge,它也是混合开发框架的核心。
WebView Scheme / URL Scheme
https://book.flutterchina.club/chapter1/mobile_development_intro.html
refs
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