解决方案:
首先请升级到flutter 1.9+版本,
然后直接在Textfield ,style属性加个文字样式,值为:TextStyle(textBaseline: TextBaseline.alphabetic),即可
new TextField( style: TextStyle(textBaseline: TextBaseline.alphabetic), ),
new TextField( style: TextStyle(textBaseline: TextBaseline.alphabetic), ),