WebKit(WKNavigationDelegate)

WebKit(展示Web界面)

WebKit(WKScriptMessageHandler)

WebKit(WKUIDelegate)

WebKit(WKNavigationDelegate)

WebKit(刷新)

WebKit(导航)

WebKit(浏览记录)

WebKit(进度条)

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使用过UIWebView的朋友都知道UIWebViewDelegate这个协议，它能帮助我们监听网页加载的进度，以及错误。

WebKit框架也有这样的协议WKNavigationDelegate，它的功能比UIWebViewDelegate更强，还能监听服务器跳转、身份认证等。

这篇博文为大家带来关于WKNavigationDelegate的介绍。

1 搭建项目

在这里我们不在使用前面的YJBaseVC，而是使用YJSeniorVC类。因为这里开始使用高级模块了。

下面就是YJSeniorVC.m的源代码。

////  YJSeniorVC.m//  WebKit////  CSDN:http://blog.csdn.net/y550918116j//  GitHub:https://github.com/937447974/Blog////  Created by yangjun on 15/11/29.//  Copyright © 2015年 阳君. All rights reserved.//#import "YJSeniorVC.h"#import <WebKit/WebKit.h>/** 屏幕宽度*/#define UIScreenWeight [[UIScreen mainScreen] bounds].size.width/** 屏幕高度*/#define UIScreenHeight [[UIScreen mainScreen] bounds].size.height@interface YJSeniorVC () <WKNavigationDelegate>@property (nonatomic, strong) WKWebView *webView;                      ///< WKWebView@end@implementation YJSeniorVC- (void)viewDidLoad {    [super viewDidLoad];    // 刷新界面    NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"];    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];    [self.webView loadRequest:urlRequest]; // 加载页面}#pragma mark - get方法- (WKWebView *)webView {    if (_webView == nil) {        // WKWebView的配置        WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];        // 显示网页        CGRect rect = CGRectZero;        rect.size.width = UIScreenWeight;        rect.size.height = UIScreenHeight;        _webView = [[WKWebView alloc] initWithFrame:rect configuration:configuration];        _webView.navigationDelegate = self; // 代理设置        [self.view addSubview:_webView];    }    return _webView;}@end

这里已经使用懒加载的方式为大家创建WKWebView，并加载百度首页。大家运行项目即可看见百度首页，如果看不见请检查自己的相关代码和查阅前面的博文。

这里还指向了WKNavigationDelegate，详见

@interface YJSeniorVC () <WKNavigationDelegate>

并使用

_webView.navigationDelegate = self; // 代理设置

让_webView的navigationDelegate指向当前类。只是当前类还没有实现WKNavigationDelegate而已。

2 WKNavigationDelegate协议

WKNavigationDelegate协议有两大核心部分，第一部分是导航部分，第二部分是页面内监听。

2.1 导航监听

#pragma mark - WKNavigationDelegate 页面跳转#pragma mark 在发送请求之前，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;#pragma mark 身份验证- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *__nullable credential))completionHandler;#pragma mark 在收到响应后，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;#pragma mark 接收到服务器跳转请求之后调用- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation;#pragma mark WKNavigation导航错误- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;#pragma mark WKWebView终止- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView;

2.2 网页监听

#pragma mark - WKNavigationDelegate 页面加载#pragma mark 页面开始加载时调用- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation;#pragma mark 当内容开始返回时调用- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation;#pragma mark 页面加载完成之后调用- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation;#pragma mark 页面加载失败时调用- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;

3 实现WKNavigationDelegate

在YJSeniorVC.m中导入如下方法。

#pragma mark - WKNavigationDelegate 页面跳转#pragma mark 在发送请求之前，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {    NSLog(@"%s",__FUNCTION__);    /**     *typedef NS_ENUM(NSInteger, WKNavigationActionPolicy) {     WKNavigationActionPolicyCancel, // 取消     WKNavigationActionPolicyAllow,  // 继续     }     */    decisionHandler(WKNavigationActionPolicyAllow);}#pragma mark 身份验证- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *__nullable credential))completionHandler {    NSLog(@"%s",__FUNCTION__);    // 不要证书验证    completionHandler(NSURLSessionAuthChallengeUseCredential, nil);}#pragma mark 在收到响应后，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {    NSLog(@"%s",__FUNCTION__);    decisionHandler(WKNavigationResponsePolicyAllow);}#pragma mark 接收到服务器跳转请求之后调用- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"%s",__FUNCTION__);}#pragma mark WKNavigation导航错误- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {    NSLog(@"%s",__FUNCTION__);}#pragma mark WKWebView终止- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {    NSLog(@"%s",__FUNCTION__);}#pragma mark - WKNavigationDelegate 页面加载#pragma mark 页面开始加载时调用- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"%s",__FUNCTION__);}#pragma mark 当内容开始返回时调用- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"%s",__FUNCTION__);}#pragma mark 页面加载完成之后调用- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"%s",__FUNCTION__);}#pragma mark 页面加载失败时调用- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {    NSLog(@"%s",__FUNCTION__);    NSLog(@"%@", error.localizedDescription);}

再次运行项目，可在控制台看见相应输出。这样我们能更细腻化的把控WKWebView。
 

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其他

源代码

Objective-C

参考资料

WebKit Framework Reference

WKWebView的新特性与使用

WKWeb​View

文档修改记录

时间 描述 2015-12-02 博文完成 2015-12-12 更改链接

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CSDN：http://blog.csdn.net/y550918116j

GitHub：https://github.com/937447974/Blog