ios开发之--WKWebView的使用

/// webView的自定义配置
@property (nonatomic, readonly, copy) WKWebViewConfiguration *configuration;

/// 导航代理
@property (nullable, nonatomic, weak) id <WKNavigationDelegate> navigationDelegate;

/// UI代理
@property (nullable, nonatomic, weak) id <WKUIDelegate> UIDelegate;

/// 访问过网页历史列表
@property (nonatomic, readonly, strong) WKBackForwardList *backForwardList;

/// 自定义初始化webView
- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration NS_DESIGNATED_INITIALIZER;

- (nullable instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;

/// url加载webView视图
- (nullable WKNavigation *)loadRequest:(NSURLRequest *)request;

/// 文件加载webView视图
- (nullable WKNavigation *)loadFileURL:(NSURL *)URL allowingReadAccessToURL:(NSURL *)readAccessURL API_AVAILABLE(macosx(10.11), ios(9.0));

/// HTMLString字符串加载webView视图
- (nullable WKNavigation *)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL;

/// NSData数据加载webView视图
- (nullable WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL API_AVAILABLE(macosx(10.11), ios(9.0));

/// 返回上一个网页节点
- (nullable WKNavigation *)goToBackForwardListItem:(WKBackForwardListItem *)item;

/// 网页的标题
@property (nullable, nonatomic, readonly, copy) NSString *title;

/// 网页的URL地址
@property (nullable, nonatomic, readonly, copy) NSURL *URL;

/// 网页是否正在加载
@property (nonatomic, readonly, getter=isLoading) BOOL loading;

/// 加载的进度 范围为[0, 1]
@property (nonatomic, readonly) double estimatedProgress;

/// 网页链接是否安全
@property (nonatomic, readonly) BOOL hasOnlySecureContent;

/// 证书服务
@property (nonatomic, readonly, nullable) SecTrustRef serverTrust API_AVAILABLE(macosx(10.12), ios(10.0));

/// 是否可以返回
@property (nonatomic, readonly) BOOL canGoBack;

/// 是否可以前进
@property (nonatomic, readonly) BOOL canGoForward;

/// 返回到上一个网页
- (nullable WKNavigation *)goBack;

/// 前进到下一个网页
- (nullable WKNavigation *)goForward;

/// 重新加载
- (nullable WKNavigation *)reload;

/// 忽略缓存 重新加载
- (nullable WKNavigation *)reloadFromOrigin;

/// 停止加载
- (void)stopLoading;

/// 执行JavaScript
- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))completionHandler;

/// 是否允许左右滑动，返回-前进操作  默认是NO
@property (nonatomic) BOOL allowsBackForwardNavigationGestures;

/// 自定义代理字符串
@property (nullable, nonatomic, copy) NSString *customUserAgent API_AVAILABLE(macosx(10.11), ios(9.0));

/// 在iOS上默认为NO，标识不允许链接预览
@property (nonatomic) BOOL allowsLinkPreview API_AVAILABLE(macosx(10.11), ios(9.0));

/// 滚动视图
@property (nonatomic, readonly, strong) UIScrollView *scrollView;

/// 是否支持放大手势，默认为NO
@property (nonatomic) BOOL allowsMagnification;

/// 放大因子，默认为1
@property (nonatomic) CGFloat magnification;

/// 据设置的缩放因子来缩放页面，并居中显示结果在指定的点
- (void)setMagnification:(CGFloat)magnification centeredAtPoint:(CGPoint)point;

/// 证书列表
@property (nonatomic, readonly, copy) NSArray *certificateChain API_DEPRECATED_WITH_REPLACEMENT("serverTrust", macosx(10.11, 10.12), ios(9.0, 10.0));

WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://developer.apple.com/reference/webkit"]]];    
[self.view addSubview:webView];

自定义配置
再WKWebView里面注册供JS调用的方法，是通过WKUserContentController类下面的方法：

- (void)addScriptMessageHandler:(id <WKScriptMessageHandler>)scriptMessageHandler name:(NSString *)name;

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
　　// 判断是否是调用原生的
   if ([@"NativeMethod" isEqualToString:message.name]) {
  　　 // 判断message的内容，然后做相应的操作
    　　if ([@"close" isEqualToString:message.body]) {

    　　}
   }
}

[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"NativeMethod"];

typedef NS_ENUM(NSInteger, WKNavigationActionPolicy) {
WKNavigationActionPolicyCancel, // 取消跳转
WKNavigationActionPolicyAllow, // 允许跳转
} API_AVAILABLE(macosx(10.10), ios(8.0));

// 1 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(@"1-------在发送请求之前，决定是否跳转  -->%@",navigationAction.request);

    decisionHandler(WKNavigationActionPolicyAllow);
}

// 2 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"2-------页面开始加载时调用");
}

// 3 在收到响应后，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    /// 在收到服务器的响应头，根据response相关信息，决定是否跳转。decisionHandler必须调用，来决定是否跳转，参数WKNavigationActionPolicyCancel取消跳转，WKNavigationActionPolicyAllow允许跳转

    NSLog(@"3-------在收到响应后，决定是否跳转");

    decisionHandler(WKNavigationResponsePolicyAllow);
}

// 4 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    NSLog(@"4-------当内容开始返回时调用");
}

// 5 页面加载完成之后调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    NSLog(@"5-------页面加载完成之后调用");
}

// 6 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation {

    NSLog(@"6-------页面加载失败时调用");
}

// 接收到服务器跳转请求之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"-------接收到服务器跳转请求之后调用");
}

// 数据加载发生错误时调用
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
    NSLog(@"----数据加载发生错误时调用");
}

// 需要响应身份验证时调用 同样在block中需要传入用户身份凭证
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler {
    //用户身份信息

    NSLog(@"----需要响应身份验证时调用 同样在block中需要传入用户身份凭证");

    NSURLCredential *newCred = [NSURLCredential credentialWithUser:@""
                                                          password:@""
                                                       persistence:NSURLCredentialPersistenceNone];
    // 为 challenge 的发送方提供 credential
    [[challenge sender] useCredential:newCred forAuthenticationChallenge:challenge];
    completionHandler(NSURLSessionAuthChallengeUseCredential,newCred);
}

// 进程被终止时调用
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {
    NSLog(@"----------进程被终止时调用");
}

/**
 *  web界面中有弹出警告框时调用
 *
 *  @param webView           实现该代理的webview
 *  @param message           警告框中的内容
 *  @param completionHandler 警告框消失调用
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(void (^)())completionHandler {

    NSLog(@"-------web界面中有弹出警告框时调用");
}

// 创建新的webView时调用的方法
- (nullable WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {

    NSLog(@"-----创建新的webView时调用的方法");
    return webView;
}

// 关闭webView时调用的方法
- (void)webViewDidClose:(WKWebView *)webView {

    NSLog(@"----关闭webView时调用的方法");
}

// 下面这些方法是交互JavaScript的方法
// JavaScript调用confirm方法后回调的方法 confirm是js中的确定框，需要在block中把用户选择的情况传递进去
-(void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {

    NSLog(@"%@",message);
    completionHandler(YES);
}
// JavaScript调用prompt方法后回调的方法 prompt是js中的输入框 需要在block中把用户输入的信息传入
-(void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable))completionHandler{

    NSLog(@"%@",prompt);
    completionHandler(@"123");
}

// 默认预览元素调用
- (BOOL)webView:(WKWebView *)webView shouldPreviewElement:(WKPreviewElementInfo *)elementInfo {

    NSLog(@"-----默认预览元素调用");
    return YES;
}

// 返回一个视图控制器将导致视图控制器被显示为一个预览。返回nil将WebKit的默认预览的行为。
- (nullable UIViewController *)webView:(WKWebView *)webView previewingViewControllerForElement:(WKPreviewElementInfo *)elementInfo defaultActions:(NSArray<id <WKPreviewActionItem>> *)previewActions {

    NSLog(@"----返回一个视图控制器将导致视图控制器被显示为一个预览。返回nil将WebKit的默认预览的行为。");
    return self;
}

// 允许应用程序向它创建的视图控制器弹出
- (void)webView:(WKWebView *)webView commitPreviewingViewController:(UIViewController *)previewingViewController {

    NSLog(@"----允许应用程序向它创建的视图控制器弹出");

}

// 显示一个文件上传面板。completionhandler完成处理程序调用后打开面板已被撤销。通过选择的网址，如果用户选择确定，否则为零。如果不实现此方法，Web视图将表现为如果用户选择了取消按钮。
- (void)webView:(WKWebView *)webView runOpenPanelWithParameters:(WKOpenPanelParameters *)parameters initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSArray<NSURL *> * _Nullable URLs))completionHandler {

    NSLog(@"----显示一个文件上传面板");

}