原因：

不知道，可能是个Bug，在真机上运行会出现。

解决方法：

在TextField的onChanged事件里添加代码：

 

 onChanged: (value) {
                                //操作
                                _textEditingController.text = value;
                                //添加的代码：光标一直在文本框后面
                                _textEditingController.value = TextEditingValue(
                                    text: _textEditingController.text,
                                    selection:
                                        TextSelection.fromPosition(TextPosition(
                                      affinity: TextAffinity.downstream,
                                      offset:
                                          _textEditingController.text.length,
                                    )));
                              },

 

 

 

 

 

 

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