參考博客：
iOS中UIWebView與WKWebView盗扒、JavaScript與OC交互、Cookie管理看我就夠（中）
iOS UIWebView 和 WKWebView 的 cookie 獲取,設置,刪除
iOS11 WKWebView過濾規(guī)則WKContentRuleListStore
Webview加載H5優(yōu)化小記
iOS 端 h5 頁面秒開優(yōu)化實踐（使用WKURLSchemeHandler）
iOS WKWebView全部API解讀
南華Coder -- WKWebview使用二三事

1缀去、WKWebView

是Apple于iOS 8.0推出的WebKit中的核心控件侣灶，用來替UIWebView。
WKWebView比UIWebView的優(yōu)勢在于：

1缕碎、更多的支持HTML5的特性
2褥影、高達60fps的滾動刷新率以及內置手勢
3、與Safari相同的JavaScript引擎
4咏雌、將UIWebViewDelegate與UIWebView拆分成了14類與3個協(xié)議（官方文檔說明）
5凡怎、更豐富的api與代理方法，比如可以獲取加載進度：estimatedProgress（UIWebView需要調用私有Api）

WKUserContentController

@property (nonatomic, strong) WKUserContentController *userContentController;

@interface WKUserContentController : NSObject <NSCoding>
//讀取添加過的腳本
@property (nonatomic, readonly, copy) NSArray<WKUserScript *> *userScripts;
//添加腳本
- (void)addUserScript:(WKUserScript *)userScript;
//刪除所有添加的腳本
- (void)removeAllUserScripts;
//通過window.webkit.messageHandlers.<name>.postMessage(<messageBody>) 來實現(xiàn)js->oc傳遞消息赊抖，并添加handler
- (void)addScriptMessageHandler:(id <WKScriptMessageHandler>)scriptMessageHandler name:(NSString *)name;
//刪除handler
- (void)removeScriptMessageHandlerForName:(NSString *)name;
@end

創(chuàng)建一個WKWebView的代碼如下：

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
WKUserContentController *controller = [[WKUserContentController alloc] init];
configuration.userContentController = controller;
self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:configuration];
self.webView.allowsBackForwardNavigationGestures = YES; //允許右滑返回上個鏈接统倒，左滑前進
self.webView.allowsLinkPreview = YES; //允許鏈接3D Touch
self.webView.customUserAgent = @"WebViewDemo/1.0.0"; //自定義UA，UIWebView就沒有此功能氛雪，后面會講到通過其他方式實現(xiàn)
self.webView.UIDelegate = self;
self.webView.navigationDelegate = self;
[self.view addSubview:self.webView];

一些屬性

@property (nullable, nonatomic, readonly, copy) NSString *title;    //頁面的title房匆，終于可以直接獲取了
@property (nullable, nonatomic, readonly, copy) NSURL *URL;     //當前webView的URL
@property (nonatomic, readonly, getter=isLoading) BOOL loading; //是否正在加載
@property (nonatomic, readonly) double estimatedProgress;   //加載的進度
@property (nonatomic, readonly) BOOL canGoBack; //是否可以后退，跟UIWebView相同
@property (nonatomic, readonly) BOOL canGoForward;  //是否可以前進报亩，跟UIWebView相同

2浴鸿、動態(tài)注入JS

（1）給每個頁面添加一個Cookie

//注入一個Cookie
WKUserScript *newCookieScript = [[WKUserScript alloc] initWithSource:@"document.cookie = 'DarkAngelCookie=DarkAngel;'" injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
[controller addUserScript:newCookieScript];

（2）然后再注入一個腳本，每當頁面加載弦追，就會alert當前頁面cookie岳链，在OC中的實現(xiàn)

//創(chuàng)建腳本
WKUserScript *cookieScript = [[WKUserScript alloc] initWithSource:@"alert(document.cookie);" injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:NO];
//添加腳本
[controller addUserScript:script];

（3）注入客戶端的登錄狀態(tài)方法

NSString *app_isLogin = [NSString stringWithFormat:@"function app_isLogin(){return %i}",[ZYXAccountInfoManager sharedManager].isLogin];
WKUserScript *userScript = [[WKUserScript alloc] initWithSource:javaScriptSource injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
[self.webView.configuration.userContentController addUserScript:userScript];

3、OC -> JS

[self.webView evaluateJavaScript:@"document.title" completionHandler:^(id _Nullable title, NSError * _Nullable error) {
        NSLog(@"調用evaluateJavaScript異步獲取title：%@", title);
}];

4劲件、JS -> OC

1掸哑、URL攔截

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    //可以通過navigationAction.navigationType獲取跳轉類型，如新鏈接零远、后退等
    NSURL *URL = navigationAction.request.URL;
    //判斷URL是否符合自定義的URL Scheme
    if ([URL.scheme isEqualToString:@"darkangel"]) {
        //根據(jù)不同的業(yè)務苗分，來執(zhí)行對應的操作，且獲取參數(shù)
        if ([URL.host isEqualToString:@"smsLogin"]) {
            NSString *param = URL.query;
            NSLog(@"短信驗證碼登錄, 參數(shù)為%@", param);
            decisionHandler(WKNavigationActionPolicyCancel);
            return;
        }
    }
    decisionHandler(WKNavigationActionPolicyAllow);
    NSLog(@"%@", NSStringFromSelector(_cmd));
}

2遍烦、WKScriptMessageHandler
OC中添加一個WKScriptMessageHandler俭嘁，則會在all frames中添加一個js的function

（1）OC中監(jiān)聽JS的方法

// 監(jiān)聽JS的currentCookies方法
[controller addScriptMessageHandler:self name:@"currentCookies"]; //這里self要遵循協(xié) WKScriptMessageHandler

（2）JS中調用下面的方法時

// JS調用currentCookies的時候寫上這句代碼
window.webkit.messageHandlers.currentCookies.postMessage(document.cookie);

（3）OC中將會收到WKScriptMessageHandler的回調

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    if ([message.name isEqualToString:@"currentCookies"]) {
        NSString *cookiesStr = message.body;    //message.body返回的是一個id類型的對象，所以可以支持很多種js的參數(shù)類型(js的function除外)
        NSLog(@"當前的cookie為： %@", cookiesStr);
    }
}

當然服猪，記得在適當?shù)牡胤秸{用removeScriptMessageHandler

- (void)dealloc {
    //記得移除
    [self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"currentCookies"];
}

實現(xiàn)JS -> OC的調用供填，并且OC -> JS 異步回調結果拐云，這里還是拿分享來舉個例子

JS

/**
   * 分享方法，并且會異步回調分享結果
   * @param  {對象類型} shareData 一個分享數(shù)據(jù)的對象近她，包含title,imgUrl,link以及一個回調function
   * @return {void}  無同步返回值
   */
  function shareNew(shareData) {

    //用于WKWebView叉瘩，因為WKWebView并沒有辦法把js function傳遞過去，因此需要特殊處理一下
    //把js function轉換為字符串粘捎，oc端調用時 (<js function string>)(true); 即可
    var result = shareData.result;
    shareData.result = result.toString();
    window.webkit.messageHandlers.shareNew.postMessage(shareData);
  }

  function test() {
     //清空分享結果
    shareResult.innerHTML = "";
    
    //調用時薇缅，應該
    shareNew({
        title: "title",
        imgUrl: "http://img.dd.com/xxx.png",
        link: location.href,
        result: function(res) {
            //這里shareResult 等同于 document.getElementById("shareResult")
            shareResult.innerHTML = res ? "success" : "failure";
        }
    });
  }

在html頁面中我定義了一個a標簽來觸發(fā)test()函數(shù)

<a href="javascript:void(0);" onclick="test()">測試新分享</a>

在OC端，實現(xiàn)如下

//首先別忘了攒磨，在configuration中的userContentController中添加scriptMessageHandler
[controller addScriptMessageHandler:self name:@"shareNew"]; //記得適當時候remove哦


//點擊a標簽時泳桦，則會調用下面的方法
#pragma mark - WKScriptMessageHandler 

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    if ([message.name isEqualToString:@"shareNew"]) {
        NSDictionary *shareData = message.body;
        NSLog(@"shareNew分享的數(shù)據(jù)為： %@", shareData);
        //模擬異步回調
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            //讀取js function的字符串
            NSString *jsFunctionString = shareData[@"result"];
            //拼接調用該方法的js字符串
            NSString *callbackJs = [NSString stringWithFormat:@"(%@)(%d);", jsFunctionString, NO];    //后面的參數(shù)NO為模擬分享失敗
            //執(zhí)行回調
            [self.webView evaluateJavaScript:callbackJs completionHandler:^(id _Nullable result, NSError * _Nullable error) {
                if (!error) {
                    NSLog(@"模擬回調，分享失敗");
                }
            }];
        });
    }
}

那么當點擊a標簽時過2s娩缰，會顯示failure灸撰。

5、Cookie管理

Cookie設置

（iOS11以前有些問題拼坎，各種方式都使用了浮毯，有些時候Cookie設置不上去）

    ///給webView注入cookie
    if (@available(iOS 11.0, *)) {
        WKHTTPCookieStore *cookieStore = self.webView.configuration.websiteDataStore.httpCookieStore;
        // 取出保存的Cookie
        NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:@"WKHTTPCookie"];
        NSArray *cookies = [NSKeyedUnarchiver unarchiveObjectWithData:data];
        for (int i=0; i< cookies.count; i++) {
            [cookieStore setCookie:cookies[i] completionHandler:nil];
        }
    } else {
        
        NSString *cookieString = [[NSUserDefaults standardUserDefaults] objectForKey:@"CookieString"];
        //cookieString=@"aaaaaa=bbbb";
        if (cookieString) {
            // 多鐘方式全都寫上，不管了
            // （1）第一種方式：request.setHTTPHeaderField
            [request setValue:cookieString forHTTPHeaderField:@"Cookie"];

            NSString *documentCookieString = [NSString stringWithFormat:@"document.cookie = '%@'",cookieString];
            NSURL *targetURL = [NSURL URLWithString:@"https://test130-m.angsi.com"];
            // （2）第二種方式
            NSArray *headeringCookie = [NSHTTPCookie cookiesWithResponseHeaderFields:@{@"Set-Cookie":documentCookieString} forURL:targetURL];
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookies:headeringCookie forURL:targetURL mainDocumentURL:nil];

            // （3）第三種方式
            WKUserScript * cookieScript = [[WKUserScript alloc] initWithSource: documentCookieString injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
            [_webView.configuration.userContentController addUserScript:cookieScript];
        }
    }
    
    [self.webView loadRequest:request];

Cookie獲取保存

// 頁面加載完成之后調用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    
    //cookies獲取存儲
    if (@available(iOS 11.0, *)) {
        WKHTTPCookieStore *cookieStore = webView.configuration.websiteDataStore.httpCookieStore;
        [cookieStore getAllCookies:^(NSArray<NSHTTPCookie *> * cookies) {
            if (cookies.count >0 ) {
                // 保存Cookie
                NSData *data = [NSKeyedArchiver archivedDataWithRootObject:cookies];
                [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"WKHTTPCookie"];
                [[NSUserDefaults standardUserDefaults] synchronize];
            }
        }];
    } else {

        // js獲取
        [webView evaluateJavaScript:[NSString stringWithFormat:@"document.cookie"] completionHandler:^(id _Nullable response, NSError * _Nullable error) {
            if (response != 0) {
                [[NSUserDefaults standardUserDefaults] setObject:response forKey:@"CookieString"];
                [[NSUserDefaults standardUserDefaults] synchronize];
            }
        }];
    }
}

JS彈窗,需要全部現(xiàn)實WKUIDelegate的代理

 #pragma mark - WKUIDelegate
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:message?:@"" preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:([UIAlertAction actionWithTitle:@"確認" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler();
    }])];
    [self presentViewController:alertController animated:YES completion:nil];
    
}
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:message?:@"" preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:([UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        completionHandler(NO);
    }])];
    [alertController addAction:([UIAlertAction actionWithTitle:@"確認" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler(YES);
    }])];
    [self presentViewController:alertController animated:YES completion:nil];
}
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable))completionHandler{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:prompt message:@"" preferredStyle:UIAlertControllerStyleAlert];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.text = defaultText;
    }];
    [alertController addAction:([UIAlertAction actionWithTitle:@"完成" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler(alertController.textFields[0].text?:@"");
    }])];
    [self presentViewController:alertController animated:YES completion:nil];
}

6泰鸡、WKURLSchemeHandler實現(xiàn)攔截（iOS11）

攔截加載本地圖片代碼例子

        WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
        [config setURLSchemeHandler:[[SchemeHandler alloc] init] forURLScheme:@"XXXXXScheme"];
        NSURL *url = [NSURL URLWithString:@"XXXXXScheme://xxxx"];
        NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
        [webView loadRequest:request];

#import <Foundation/Foundation.h>
#import <WebKit/WebKit.h>
@interface SchemeHandler : NSObject<WKURLSchemeHandler>
@end

#import "SchemeHandler.h"

@implementation SchemeHandler

- (void)webView:(WKWebView *)webView startURLSchemeTask:(id <WKURLSchemeTask>)urlSchemeTask
{
    UIImage *image = [UIImage imageNamed:@"photo"];
    NSData *data =  UIImageJPEGRepresentation(image, 1.0);
    // 這里可以換成任何資源：image/jpg债蓝、text/html
    [urlSchemeTask didReceiveResponse:[[NSURLResponse alloc] initWithURL:urlSchemeTask.request.URL MIMEType:@"image/jpg" expectedContentLength:data.length textEncodingName:nil]];
    [urlSchemeTask didReceiveData:data];
    [urlSchemeTask didFinish];
}

- (void)webView:(WKWebView *)webView stopURLSchemeTask:(id <WKURLSchemeTask>)urlSchemeTask;
{
    urlSchemeTask = nil;
}

@end

7、使用WKWebView需要注意的地方

1盛龄、Cookie問題

2饰迹、白屏問題

當WKWebView加載的網(wǎng)頁占用內存過大時，會出現(xiàn)白屏現(xiàn)象讯嫂。

解決：
A蹦锋、借助 WKNavigtionDelegate： (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView API_AVAILABLE(macosx(10.11), ios(9.0));回調函數(shù)：
當 WKWebView 總體內存占用過大，頁面即將白屏的時候欧芽，系統(tǒng)會調用上面的回調函數(shù)，我們在該函數(shù)里執(zhí)行[webView reload](這個時候 webView.URL 取值尚不為 nil）解決白屏問題葛圃。在一些高內存消耗的頁面可能會頻繁刷新當前頁面千扔，H5側也要做相應的適配操作。

// 白屏處理
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {
    [webView reload];   //刷新就好了
}

B库正、檢測 webView.title 是否為空：在WKWebView白屏的時候曲楚，另一種現(xiàn)象是 webView.titile 會被置空, 因此，可以在 viewWillAppear 的時候檢測 webView.title 是否為空來 reload 頁面

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    // 白屏處理
    if (self.webView.title == nil) {
        [self.webView reload];
    }
}