iOS11 WKWebView 无法加载 iOS11 WKWebView 无法加载内容的解决办法
dj_rose 人气:5问题描述: iOS9和iOS10用WKWebView加载URL都没有问题,iOS11却是一片空白
可能是用了 NSMutableURLRequest ,iOS11貌似不支持 NSMutableURLRequest ,无论是用 UIWebView 还是 WKWebView ,都不支持 NSMutableURLRequest
解决方法参考
if #available(iOS 11, *) { let request = NSURLRequest.init(url: URL.init(string: urlStr)!) self.wkWebView.load(request as URLRequest) }else{ let request = NSMutableURLRequest.init(url: URL.init(string: urlStr)!, cachePolicy: NSURLRequest.CachePolicy.reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 60) request.httpMethod = "GET" request.httpBody = ("token=" + tokenValue()).data(using: String.Encoding.utf8) self.wkWebView.load(request as URLRequest) }
iOS11 Xcode9 WKWebView崩溃问题解决方案
正式版的iOS11&Xcode 9已经发布,乘着版本空档期,赶紧花点时间完成适配工作。
在用iPhone X 的模拟器进入Hybrid项目时,发现一进去就崩溃,崩溃信息少的可怜:
libc++abi.dylib: terminating with uncaught exception of type NSException
靠这玩意儿肯定是定位不出bug的,不过全局断点还是给出了一点信息:
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { NSString *requestString = navigationAction.request.URL.absoluteString; //对外链、拨号和跳转appstore做特殊处理 UIApplication *app = [UIApplication sharedApplication]; NSURL *url = [navigationAction.request URL]; //电话 //此处省略若干业务代码 if ([url.absoluteString containsString:@"itunes.apple.com"]) { if ([app canOpenURL:url]) { [app openURL:url]; decisionHandler(WKNavigationActionPolicyCancel); } } if ([requestString hasPrefix:@"easy-js:"]) { [self handleRequestString:requestString webView:(EasyJSWebView *)webView.superview]; decisionHandler(WKNavigationActionPolicyCancel); } if ([self.realDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) { [self.realDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler]; } decisionHandler(WKNavigationActionPolicyAllow);//崩在这里 }
仍然不知道为啥子崩在这儿?之前一直是没问题的啊??
小Tips:
为了获取一些堆栈信息以便于快准狠的定位问题,可以在main函数里:
int main(int argc, char * argv[]) { @try { @autoreleasepool { return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); } } @catch (NSException* exception) { NSDebugLog(@"Exception=%@\nStack Trace:%@", exception, [exception callStackSymbols]); } }
最终得到一条关键报错:
Completion handler passed to -[WKPrivateNavigationDelegate webView:decidePolicyForNavigationAction:decisionHandler:] was called more than once
意思就是WKWebView的这个代理方法被多次调用了。
if ([requestString hasPrefix:@"easy-js:"]) { [self handleRequestString:requestString webView:(EasyJSWebView *)webView.superview]; decisionHandler(WKNavigationActionPolicyCancel); } if ([self.realDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) { [self.realDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler]; } decisionHandler(WKNavigationActionPolicyAllow);//崩在这里
简单分析一下被多次调用的原因:
1、系统判断这个方法被多次执行,主要是看decisionHandler()是否被多次执行;
2、由于if判断里会执行decisionHandler(),最后一行代码也会执行decisionHandler(),并且self.realDelegate中也会执行decisionHandler(),这就导致了decisionHandler()这个handler可能会被多次执行。
那解决问题的方向就是修改代码保证WKWebView单次LoadRequest只调一次此代理方法~
修改如下:
if ([requestString hasPrefix:@"easy-js:"]) { [self handleRequestString:requestString webView:(EasyJSWebView *)webView.superview]; decisionHandler(WKNavigationActionPolicyCancel); } else if ([self.realDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) { [self.realDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler]; } else { decisionHandler(WKNavigationActionPolicyAllow); }
即保证了单次LoadRequest只执行一次decisionHandler()
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