問題一描述:
iOS9和iOS10用WKWebView加載URL都沒有問題,iOS11卻是一片空白
可能是用了NSMutableURLRequest,iOS11貌似不支持NSMutableURLRequest,無論是用UIWebView還是WKWebView,都不支持NSMutableURLRequest
解決方法參考
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) }問題二描述：在用iPhone X 的模擬器進(jìn)入Hybrid項(xiàng)目時(shí)，發(fā)現(xiàn)一進(jìn)去就崩潰，崩潰信息少的可憐：
libc++abi.dylib: terminating with uncaught exception of type NSException
靠這玩意兒肯定是定位不出bug的，不過全局?jǐn)帱c(diǎn)還是給出了一點(diǎn)信息：
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { NSString *requestString = navigationAction.request.URL.absoluteString; //對(duì)外鏈、撥號(hào)和跳轉(zhuǎn)appstore做特殊處理 UIApplication *app = [UIApplication sharedApplication]; NSURL *url = [navigationAction.request URL]; //電話 //此處省略若干業(yè)務(wù)代碼 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);//崩在這里}仍然不知道為啥子崩在這兒？之前一直是沒問題的啊？？
小Tips：
為了獲取一些堆棧信息以便于快準(zhǔn)狠的定位問題，可以在main函數(shù)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]); }}最終得到一條關(guān)鍵報(bào)錯(cuò)：
Completion handler passed to -[WKPrivateNavigationDelegate webView:decidePolicyForNavigationAction:decisionHandler:] was called more than once
意思就是WKWebView的這個(gè)代理方法被多次調(diào)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);//崩在這里簡單分析一下被多次調(diào)用的原因：
1、系統(tǒng)判斷這個(gè)方法被多次執(zhí)行，主要是看decisionHandler()是否被多次執(zhí)行；
2、由于if判斷里會(huì)執(zhí)行decisionHandler()，最后一行代碼也會(huì)執(zhí)行decisionHandler()，并且self.realDelegate中也會(huì)執(zhí)行decisionHandler()，這就導(dǎo)致了decisionHandler()這個(gè)handler可能會(huì)被多次執(zhí)行。
那解決問題的方向就是修改代碼保證WKWebView單次LoadRequest只調(diào)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); }即保證了單次LoadRequest只執(zhí)行一次decisionHandler()
問題三描述：iOS11 WKWebview獲取高度不準(zhǔn)確
遇見這個(gè)問題的時(shí)候，我發(fā)現(xiàn)偏離了大概64像素，由此聯(lián)想到了tableView和collectionView。
故解決辦法如下：
if (@available(iOS 11.0, *)) { _webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever; _webView.scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0); _webView.scrollView.scrollIndicatorInsets = _webView.scrollView.contentInset; }新聞熱點(diǎn)
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