时间：2021-08-21 09:11:14 | 栏目：iOS代码 | 点击：次
前言
本文主要给大家介绍了关于iOS WKWebViewJavascriptBridge Xcode9中导致crash的相关解决办法，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。
WKWebViewJavascriptBridge 这个第三方还是比较不错的，但是最近Xcode9上，却出现了crash；WKWebViewJavascriptBridge官方github看了大家也都有如此问题，最后终于解决了；
需要在WKWebViewJavascriptBridge类里，如下修改：
- (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);
} else {
/// 在这新添加了else
if (strongDelegate && [strongDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) {
[_webViewDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler];
} else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}
}
或这样修改
- (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);
/// 在这新添加了return
return;
}
if (strongDelegate && [strongDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) {
[_webViewDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler];
} else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}
我猜测主要原因是 Xcode9上，decisionHandler() 这个block回调，不允许多次被调用；
总结
参考链接
1、 https://github.com/marcuswestin/WebViewJavascriptBridge/issues/302
2、http://www.jianshu.com/p/909afcbc401e