当我滚动时，Listview 抛出错误

Question

已编辑：此错误仅在 IOS 设备上出现，在 android 上没有问题。

当我滚动 AlertDialog 时，RangeError 被捕获。我有更多带有纯文本的 AlertDialogs，没有这样的问题。 滚动时，错误一直被抛出。我知道有类似的问题，但它们都使用构建器并且可以定义 Itemcount。

               showDialog(
                  context: context,
                  builder: (BuildContext context) {
                    return AlertDialog(
                      elevation: 20,
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(15.0),
                      ),
                      content: Container(
                        width: double.maxFinite,
                        height: 130,
                        child: ListView(children: <Widget>[
                          
                          RichText(
                              text: TextSpan(children: [
                            TextSpan(
                                text: 'Feedback:',
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                text: "\n",
                                style: TextStyle(color: Colors.black)),
                            WidgetSpan(
                                child: Icon(
                              Icons.email,
                              size: 15,
                            )),
                            TextSpan(
                                text:
                                    '  email@outlook.com' + "\n",
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                text: "\n",
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                text: 'Updates:',
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                text: "\n",
                                style: TextStyle(color: Colors.black)),
                            WidgetSpan(
                                child: Icon(
                              Icons.link,
                              size: 15,
                            )),
                            TextSpan(
                                text: '  ',
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                style: TextStyle(
                                  color: Colors.blue,
                                  decoration: TextDecoration.underline,
                                ),
                                text: 'Instagram' + "\n",
                                recognizer: TapGestureRecognizer()
                                  ..onTap = () async {
                                    var url =
                                        "https://www.instagram.com/";
                                    if (await canLaunch(url)) {
                                      await launch(url);
                                    } else {
                                      throw "Cannot load Url";
                                    }
                                  }),
                            TextSpan(
                                text: "\n",
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                text: 'Support',
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                text: "\n",
                                style: TextStyle(color: Colors.black)),
                            WidgetSpan(
                                child: Icon(
                              Icons.payment,
                              size: 15,
                            )),
                            TextSpan(
                                text: '  ',
                                style: TextStyle(color: Colors.black)),
                            TextSpan(
                                style: TextStyle(
                                  color: Colors.blue,
                                  decoration: TextDecoration.underline,
                                ),
                                text: 'Paypal',
                                recognizer: TapGestureRecognizer()
                                  ..onTap = () async {
                                    var url =
                                        "https://www.paypal.me/";
                                    if (await canLaunch(url)) {
                                      await launch(url);
                                    } else {
                                      throw "Cannot load Url";
                                    }
                                  }),
                          ]))
                        ]),
                      ),
                    );
                  });

遵循错误和堆栈跟踪：

======== Exception caught by scheduler library =====================================================
The following RangeError was thrown during a scheduler callback:
RangeError (index): Invalid value: Valid value range is empty: 0

When the exception was thrown, this was the stack: 
#0      List.[] (dart:core-patch/growable_array.dart:177:60)
#1      List.elementAt (dart:core-patch/growable_array.dart:386:16)
#2      RenderParagraph.assembleSemanticsNode (package:flutter/src/rendering/paragraph.dart:921:50)
#3      _SwitchableSemanticsFragment.compileChildren (package:flutter/src/rendering/object.dart:3717:13)
#4      _SwitchableSemanticsFragment.compileChildren (package:flutter/src/rendering/object.dart:3709:16)
...

其他一切正常。感谢您的帮助！