WKWebView的優勢

• 在效能、穩定性、功能方面有很大提升（最直觀的體現就是載入網頁是佔用的記憶體，模擬器載入百度與開源中國網站時，WKWebView佔用23M，而UIWebView佔用85M）
• 更多的支援HTML5的特性
• 允許JavaScript的Nitro庫載入並使用（UIWebView中限制）；
• 高達60fps的滾動重新整理率以及內建手勢；
• 將UIWebViewDelegate與UIWebView重構成了14類與3個協議（檢視蘋果官方文件）；

基本使用方法

WKWebView有兩個delegate,WKUIDelegate 和 WKNavigationDelegate。WKNavigationDelegate主要處理一些跳轉、載入處理操作，WKUIDelegate主要處理JS指令碼，確認框，警告框等。因此WKNavigationDelegate更加常用。

比較常用的方法

- (void)viewDidLoad {
    [super viewDidLoad];
    webView = [[WKWebView alloc]init];
    [self.view addSubview:webView];
    [webView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view);
        make.right.equalTo(self.view);
        make.top.equalTo(self.view);
        make.bottom.equalTo
 
(self.view);
    }];
    webView.UIDelegate = self;
    webView.navigationDelegate = self;
    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];

}

#pragma mark - WKNavigationDelegate
// 頁面開始載入時呼叫
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation
 
 *)navigation{

}
// 當內容開始返回時呼叫
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation{

}
// 頁面載入完成之後呼叫
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{

}
// 頁面載入失敗時呼叫
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation{

}
// 接收到伺服器跳轉請求之後呼叫
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation{

}
// 在收到響應後，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{

    NSLog(@"%@",navigationResponse.response.URL.absoluteString);
    //允許跳轉
    decisionHandler(WKNavigationResponsePolicyAllow);
    //不允許跳轉
    //decisionHandler(WKNavigationResponsePolicyCancel);
}
// 在傳送請求之前，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{

     NSLog(@"%@",navigationAction.request.URL.absoluteString);
    //允許跳轉
    decisionHandler(WKNavigationActionPolicyAllow);
    //不允許跳轉
    //decisionHandler(WKNavigationActionPolicyCancel);
}
#pragma mark - WKUIDelegate
// 建立一個新的WebView
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures{
    return [[WKWebView alloc]init];
}
// 輸入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler{
    completionHandler(@"http");
}
// 確認框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler{
    completionHandler(YES);
}
// 警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{
    NSLog(@"%@",message);
    completionHandler();
}

本來打算自己寫的，參考了一些別人的部落格，覺得他們寫的簡直太好了，所以直接粘連結吧

簡書WKWebView的使用