@interface BaiduViewController () <WKNavigationDelegate, WKUIDelegate>

@property (strong, nonatomic) WKWebView *webView;

@end


@implementation BaiduViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
  // 圖片縮放的js代碼
    NSString *js = @"var count = document.images.length;for (var i = 0; i < count; i++) {var image = document.images[i];image.style.width=320;};window.alert('加載' + count + '的圖');";
    
    // 根據JS字符串初始化WKUserScript對象
    WKUserScript *script = [[WKUserScript alloc] initWithSource:js injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
    
    // 根據生成的WKUserScript對象，初始化WKWebViewConfiguration
    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
    [config.userContentController addUserScript:script];
    
    _webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
    //_webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
    _webView.UIDelegate = self;
    _webView.navigationDelegate = self;
    [self.view addSubview:_webView];
    
    [_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.baidu.com"]]];
}


#pragma mark - WKNavigationDelegate

/**
 *  在發送請求之前，決定是否跳轉 01
 *
 *  @param webView          實現該代理的webview
 *  @param navigationAction 當前navigation
 *  @param decisionHandler  是否調轉block
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    

    // 是否允許跳轉
    decisionHandler(WKNavigationActionPolicyAllow);
}

/**
 *  頁面開始加載時調用 02
 *
 *  @param webView    實現該代理的webview
 *  @param navigation 當前navigation
 */
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {

}

/**
 *  在收到響應后，決定是否跳轉 03
 *
 *  @param webView            實現該代理的webview
 *  @param navigationResponse 當前navigation
 *  @param decisionHandler    是否跳轉block
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    
    NSString *lowercaseString = navigationResponse.response.URL.host.lowercaseString ;
     // 是否允許跳轉
    decisionHandler(WKNavigationResponsePolicyAllow);
}


/**
 *  當內容開始返回時調用 04
 *
 *  @param webView    實現該代理的webview
 *  @param navigation 當前navigation
 */
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
}

/**
 *  頁面加載完成之后調用 05
 *
 *  @param webView    實現該代理的webview
 *  @param navigation 當前navigation
 */
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
}

/**
 *  加載失敗時調用
 *
 *  @param webView    實現該代理的webview
 *  @param navigation 當前navigation
 *  @param error      錯誤
 */
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {
}

/**
 *  接收到服務器跳轉請求之后調用
 *
 *  @param webView      實現該代理的webview
 *  @param navigation   當前navigation
 */
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {

}

#pragma mark - WKUIDelegate

/**
 *  web界面中有彈出警告框時調用
 *
 *  @param webView           實現該代理的webview
 *  @param message           警告框中的內容
 *  @param frame             主窗口
 *  @param completionHandler 警告框消失調用
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    
    [[[UIAlertView alloc] initWithTitle:@"溫馨提示" message:message delegate:nil cancelButtonTitle:@"確認" otherButtonTitles: nil] show];
    
    completionHandler();
}

//運行JavaScript確認面板與消息
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
    
    NSLog(@"message%@",message);
}

//運行JavaScript確認面板與消息
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *))completionHandler {
    NSLog(@"defaultText%@",defaultText);
    
}

// 從web界面中接收到一個腳本時調用
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    
    NSLog(@"%@", message);
}



@end