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wkwebview 代理介绍
iOS 8引入了一个新的框架——WebKit，之后变得好起来了。在WebKit框架中，有WKWebView可以替换UIKit的UIWebView和AppKit的WebView，而且提供了在两个平台可以一致使用的接口。WebKit框架使得开发者可以在原生App中使用Nitro来提高网页的性能和表现，Nitro就是Safari的JavaScript引擎。WebKit 介绍
下面举个??
代码中有详细的注释
//// ViewController.m// WKWebView01//// Created by njdby on 16/7/8.// Copyright © 2016年 njdby. All rights reserved.//#import "ViewController.h"#import <WebKit/WebKit.h>@interface ViewController ()<WKUIDelegate, WKNavigationDelegate,WKScriptMessageHandler>@property (nonatomic, strong) WKWebView *webView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; // 设置偏好设置 config.preferences = [[WKPreferences alloc] init]; // 默认为0 config.preferences.minimumFontSize = 10; // 默认认为YES config.preferences.javaScriptEnabled = YES; // 在iOS上默认为NO，表示不能自动通过窗口打开 config.preferences.javaScriptCanOpenWindowsAutomatically = NO; // web内容处理池，由于没有属性可以设置，也没有方法可以调用，不用手动创建 config.processPool = [[WKProcessPool alloc] init]; // 通过JS与webview内容交互 config.userContentController = [[WKUserContentController alloc] init]; // 注入JS对象名称AppModel，当JS通过AppModel来调用时， // 我们可以在WKScriptMessageHandler代理中接收到 [config.userContentController addScriptMessageHandler:self name:@"AppModel"]; self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config]; [self.view addSubview:self.webView]; // 导航代理 self.webView.navigationDelegate = self; // 与webview UI交互代理 self.webView.UIDelegate = self;// [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.baidu.com"]]]; NSURL *path = [[NSBundle mainBundle] URLForResource:@"test" withExtension:@"html"]; [self.webView loadRequest:[NSURLRequest requestWithURL:path]]; // 添加KVO监听 [self.webView addObserver:self forKeyPath:@"loading" options:NSKeyValueObservingOptionNew context:nil]; [self.webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:nil]; [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];}#pragma mark - WKUIDelegate#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_9_0- (void)webViewDidClose:(WKWebView *)webView { NSLog(@"%s", __FUNCTION__);}#endif// 创建一个新的WebView（标签带有 target=‘_blank‘ 时，导致WKWebView无法加载点击后的网页的问题。）- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures { // 接口的作用是打开新窗口委托 WKFrameInfo *frameInfo = navigationAction.targetFrame; if (![frameInfo isMainFrame]) { [webView loadRequest:navigationAction.request]; } return nil;}// 在JS端调用alert函数时，会触发此代理方法。// JS端调用alert时所传的数据可以通过message拿到// 在原生得到结果后，需要回调JS，是通过completionHandler回调- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler { NSLog(@"%s", __FUNCTION__); UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:@"JS调用alert" preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler(); }]]; [self presentViewController:alert animated:YES completion:NULL]; NSLog(@"%@", message);}// JS端调用confirm函数时，会触发此方法// 通过message可以拿到JS端所传的数据// 在iOS端显示原生alert得到YES/NO后// 通过completionHandler回调给JS端- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler { NSLog(@"%s", __FUNCTION__); UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"confirm" message:@"JS调用confirm" preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler(YES); }]]; [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) { completionHandler(NO); }]]; [self presentViewController:alert animated:YES completion:NULL]; NSLog(@"%@", message);}// JS端调用prompt函数时，会触发此方法// 要求输入一段文本// 在原生输入得到文本内容后，通过completionHandler回调给JS- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler { NSLog(@"%s", __FUNCTION__); NSLog(@"%@", prompt); UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"textinput" message:@"JS调用输入框" preferredStyle:UIAlertControllerStyleAlert]; [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) { textField.textColor = [UIColor redColor]; }]; [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler([[alert.textFields lastObject] text]); }]]; [self presentViewController:alert animated:YES completion:NULL];}#pragma mark - WKNavigationDelegate#pragma mark - WKNavigationDelegate/** * 在发送请求之前，决定是否跳转 * * @param webView 实现该代理的 * @param navigationAction 当前navigation * @param decisionHandler 是否调转block */- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { NSString *hostname = navigationAction.request.URL.host.lowercaseString; if (navigationAction.navigationType == WKNavigationTypeLinkActivated && ![hostname containsString:@".baidu.com"]) { // 对于跨域，需要手动跳转 [[UIApplication sharedApplication] openURL:navigationAction.request.URL]; // 不允许web内跳转 decisionHandler(WKNavigationActionPolicyCancel); } else { self.progressView.alpha = 1.0; decisionHandler(WKNavigationActionPolicyAllow); } NSLog(@"%s", __FUNCTION__);}/** * 在收到响应后，决定是否跳转 * * @param webView 实现该代理的webview * @param navigationResponse 当前navigation * @param decisionHandler 是否跳转block */- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler { // NSLog(@"%@",navigationResponse.response); // 如果响应的地址是百度，则允许跳转 // if ([navigationResponse.response.URL.host.lowercaseString isEqual:@"www.baidu.com"]) { // // // 允许跳转 // decisionHandler(WKNavigationResponsePolicyAllow); // return; // } // // 不允许跳转 // decisionHandler(WKNavigationResponsePolicyCancel); decisionHandler(WKNavigationResponsePolicyAllow);}/** * 页面开始加载时调用 * * @param webView 实现该代理的webview * @param navigation 当前navigation */- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation { NSLog(@"%s", __FUNCTION__);}/** * 接收到服务器跳转请求之后调用 * * @param webView 实现该代理的webview * @param navigation 当前navigation */- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation { NSLog(@"%s", __FUNCTION__);}/** * 加载失败时调用 * * @param webView 实现该代理的webview * @param navigation 当前navigation * @param error 错误 */- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error { NSLog(@"%s", __FUNCTION__);}/** * 当内容开始返回时调用 * * @param webView 实现该代理的webview * @param navigation 当前navigation */- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation { NSLog(@"%s", __FUNCTION__);}/** * 页面加载完成之后调用 * * @param webView 实现该代理的webview * @param navigation 当前navigation */- (