1. 在加載本地Html文件的時候，報了如下的錯誤：
   reason: 'Completion handler passed to -[JavaScriptCallOCViewController webView:decidePolicyForNavigationAction:decisionHandler:] was not called'

錯誤的原因是： 在方法

 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler 

中未實現(xiàn) decisionHandler(WKNavigationActionPolicyCancel） block 的回調。

未實現(xiàn)回調報錯.png

代理方法中，未實現(xiàn)block的回調

方法中未實現(xiàn)回調.png

放開上圖中的注釋部分就可以了。

// 必須實現(xiàn)decisionHandler的回調，否則就會報錯
    if (navigationAction.navigationType == WKNavigationTypeLinkActivated) {
        decisionHandler(WKNavigationActionPolicyCancel);
        NSLog(@"WKNavigationActionPolicyCancel");
    } else {
        decisionHandler(WKNavigationActionPolicyAllow);
        NSLog(@"WKNavigationActionPolicyAllow");
    }

另外一個代理方法也是，需要實現(xiàn)block的回調，不然也會報錯。
這個方法是在加載網(wǎng)絡頁面的時候調用。

- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler

錯誤提示如下：
reason: 'Completion handler passed to -[JavaScriptCallOCViewController webView:decidePolicyForNavigationResponse:decisionHandler:] was not called'

代理方法中未實現(xiàn)回調報錯.png

要實現(xiàn)的代理方法回調.png

#pragma mark 在收到響應后，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
{
    NSLog(@"6->在收到響應后，決定是否跳轉");
    NSLog(@"navigationResponse = %@", navigationResponse);
    NSLog(@"navigationResponse.response = %@", navigationResponse.response);
    // 必須實現(xiàn)decisionHandler的回調，否則就會報錯
    decisionHandler(WKNavigationResponsePolicyAllow);
    NSLog(@"WKNavigationResponsePolicyAllow");
}