Question

错误：

警告：尝试呈现已经呈现的内容

似乎alert(confirm('ok?'));样式代码触发器在WKWebview的委托中同时呈现视图控制器，有没有办法支持这个？

我的HTML：

    <button onclick="alert(1);">alert</button><br>
    <button onclick="alert(confirm('ok?'));">confirm</button><br>
    <button onclick="alert(prompt('please input'));">text</button><br>

我的代码：

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{
    NSLog(@"runJavaScriptAlertPanelWithMessage:%@", message);
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"TITLE" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"runJavaScriptAlertPanelWithMessage:%@, did clicked", message);
    }];
    [alert addAction:action];
    completionHandler();
    [self presentViewController:alert animated:YES completion:nil];
}
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler{
    NSLog(@"runJavaScriptAlertPanelWithMessage:%@", message);
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"TITLE" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"runJavaScriptConfirmPanelWithMessage:%@, did clicked yes", message);
    }];
    UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"runJavaScriptConfirmPanelWithMessage:%@, did click cancel", message);
    }];
    [alert addAction:action];
    [alert addAction:actionCancel];
    completionHandler(YES);
    [self presentViewController:alert animated:YES completion:nil];
}

Answer 1

抱歉，我的坏。

你应该在每个动作回调中使用completionHandler，而不是仅仅把它放在委托主体中，所以它可能是这样的：

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler{
    NSLog(@"runJavaScriptAlertPanelWithMessage:%@", message);
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"runJavaScriptConfirmPanelWithMessage:%@, did clicked", message);
        completionHandler(YES);
    }];
    UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"runJavaScriptConfirmPanelWithMessage:%@, did click cancel", message);
        completionHandler(NO);
    }];
    [alert addAction:action];
    [alert addAction:actionCancel];
    [self presentViewController:alert animated:YES completion:nil];
}

提醒（确认（＆＃39;确定？＆＃39;））在WKWebview中无法正常工作

1 个答案: