updated to run with latest flutter, dart and package updates

ios/Runner/AppDelegate.swift

@@ -7,6 +7,15 @@ import Flutter
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
+
+        FlutterLocalNotificationsPlugin.setPluginRegistrantCallback { (registry) in
+          GeneratedPluginRegistrant.register(with: registry)
+        }
+
+        if #available(iOS 10.0, *) {
+              UNUserNotificationCenter.current().delegate = self as UNUserNotificationCenterDelegate
+        }
+
     GeneratedPluginRegistrant.register(with: self)
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }

lib/calc/bmiCalc.dart

@@ -2,20 +2,26 @@
 import 'dart:math';
 
 class BMICalculator {
-  BMICalculator({this.height, this.weight, this.age, this.waist, this.gender});
+  BMICalculator({
+    required this.height,
+    required this.weight,
+    required this.age,
+    this.waist,
+    required this.gender,
+  });
 
   final int height;
   final double weight;
   final int age;
-  final int waist;
+  final int? waist;
   final int gender;
 
   double _bmi = 0;
   double _bf = 0;
 
   double calculateBMI() {
-    _bmi = weight / pow(height / 100, 2);
-    return num.parse(_bmi.toStringAsFixed(1));
+    _bmi = (weight / pow(height / 100, 2));
+    return double.parse(_bmi.toStringAsFixed(1));
   }
 
   double calculateBF() {
@@ -29,10 +35,10 @@ class BMICalculator {
         (0.005 * _bmi * _bmi * gender) +
         (0.00021 * _bmi * _bmi * age);
     if (_bf > 0)
-      return num.parse(_bf.toStringAsFixed(1));
+      return double.parse(_bf.toStringAsFixed(1));
     else
       return 0;
   }
 
-  // Body fat % = -44.988 + (0.503 * age) + (10.689 * gender) + (3.172 * BMI) - (0.026 * BMI2) + (0.181 * BMI * gender) - (0.02 * BMI * age) - (0.005 * BMI2 * gender) + (0.00021 * BMI2 * age)
+// Body fat % = -44.988 + (0.503 * age) + (10.689 * gender) + (3.172 * BMI) - (0.026 * BMI2) + (0.181 * BMI * gender) - (0.02 * BMI * age) - (0.005 * BMI2 * gender) + (0.00021 * BMI2 * age)
 }

lib/components/buttonButton.dart

@@ -3,8 +3,8 @@ import 'package:flutter/material.dart';
 import 'package:bp_notepad/components/constants.dart';
 
 class ButtonButton extends StatelessWidget {
-  ButtonButton({@required this.onTap, @required this.buttonTitle});
-  final Function onTap;
+  ButtonButton({required this.onTap, required this.buttonTitle});
+  final VoidCallback onTap;
   final String buttonTitle;
   @override
   Widget build(BuildContext context) {

lib/components/iconContent.dart

@@ -2,9 +2,9 @@
 import 'package:flutter/material.dart';
 
 class IconFont extends StatelessWidget {
-  IconFont({this.icon, this.lable, this.textStyle,this.colorStyle});
+  IconFont({required this.icon, required this.label, required this.textStyle,required this.colorStyle});
   final IconData icon;
-  final String lable;
+  final String label;
   final TextStyle textStyle;
   final Color colorStyle;
 
@@ -21,7 +21,7 @@ class IconFont extends StatelessWidget {
         const SizedBox(
           height: 10.0,
         ),
-        Text(lable, style: textStyle)
+        Text(label, style: textStyle)
       ],
     );
   }