Merge pull request #20 from Jamesweng/master

fix FlutterError: This widget has been unmounted, so the State no longer has a context

Author: waseemdev

src/generators/class-generator.ts

@@ -1,8 +1,8 @@
-import { RootWidgetModel, WidgetModel, VariableModel, FormControlModel } from "../models/models";
+import { FormControlModel, RootWidgetModel, VariableModel, WidgetModel } from "../models/models";
+
 import { WidgetCodeGenerator } from "./widget-generator";
 import { getUniqueBy } from "../utils";
 
-
 export class ClassCodeGenerator {
     private readonly widgetGenerator: WidgetCodeGenerator;
 
@@ -209,7 +209,7 @@ class ${widgetName} extends StatelessWidget${mixinsCode} {
             ...(hasController ? rootWidget.params.filter(a => !!a.name).map(a => `ctrl._${a.name} = widget.${a.name};`) : []),
             ...controllers.filter(a => !a.isPrivate && !a.skipGenerate).map(a => `${hasController ? `ctrl._${a.name} = `: ''}${a.name} = ${a.value ? a.value : `new ${a.type}()`};`),
             ...rootWidget.vars.map(a => `${hasController ? `ctrl._${a.name} = `: ''}${a.name} = ${a.value};`),
-            ...(hasController ? [`WidgetsBinding.instance.addPostFrameCallback((_) => ctrl.afterFirstBuild(context));`] : [])
+            ...(hasController ? [`WidgetsBinding.instance.addPostFrameCallback((_) => mounted ? ctrl.afterFirstBuild(context) : null);`] : [])
         ];
         const superParams = rootWidget.params
           .filter(a => a.superParamName)
@@ -327,4 +327,4 @@ class ${rootWidget.controller} extends ${rootWidget.controller}Base {
 
         return new Array(...new Set(res));
     }
-}
+}