修复TextField失去焦点时,controller.clear()报错的问题

Author: phoenixsky

lib/ui/page/user/login_field_widget.dart

@@ -167,7 +167,9 @@ class _LoginTextFieldClearIconState extends State<LoginTextFieldClearIcon> {
       },
       child: InkWell(
           onTap: () {
+            WidgetsBinding.instance.addPostFrameCallback((_) {
               widget.controller.clear();
+            });
           },
           child: Icon(CupertinoIcons.clear,
               size: 30, color: Theme.of(context).hintColor)),