27
2017
09

iOS_Xcode9_项目报错

更新Xcode9之后,运行、跳转至H5页面,发生崩溃。显示的报错信息如下:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Completion handler passed to -[WKWebViewJavascriptBridge webView:decidePolicyForNavigationAction:decisionHandler:] was called more than once'

解决方法,在WKWebViewJavascriptBridge.m内在对应位置添加如下代码:

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    if (webView != _webView) { return; }
    NSURL *url = navigationAction.request.URL;
    __strong typeof(_webViewDelegate) strongDelegate = _webViewDelegate;

    if ([_base isWebViewJavascriptBridgeURL:url]) {
        if ([_base isBridgeLoadedURL:url]) {
            [_base injectJavascriptFile];
        } else if ([_base isQueueMessageURL:url]) {
            [self WKFlushMessageQueue];
        } else {
            [_base logUnkownMessage:url];
        }
        decisionHandler(WKNavigationActionPolicyCancel);
        return;// 处理报错,添加此行代码
    }

    if (strongDelegate && [strongDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) {
        [_webViewDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler];
    } else {
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}
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