feat:增加数据存储

lib/provider/health_provider.dart

@@ -0,0 +1,43 @@
+import 'package:fitnote/models/health.dart';
+import 'package:flutter/material.dart';
+
+class HealthProvider with ChangeNotifier {
+  late HealthRecord _formItem;
+
+  HealthRecord get formItem => _formItem;
+
+  void resetForm() {
+    _formItem = HealthRecord.getEmpty();
+    notifyListeners();
+  }
+
+  void initForm(HealthRecord record) {
+    _formItem = record;
+    notifyListeners();
+  }
+
+  void updateWeight(num weight) {
+    _formItem.weight = weight;
+    notifyListeners();
+  }
+
+  void updateSportProject(String sportProject) {
+    _formItem.sportProject = sportProject;
+    notifyListeners();
+  }
+
+  void updateSportDuration(num sportDuration) {
+    _formItem.sportDuration = sportDuration;
+    notifyListeners();
+  }
+
+  void updateSleepStartTime(String sleepStartTime) {
+    _formItem.sleepStartTime = sleepStartTime;
+    notifyListeners();
+  }
+
+  void updateSleepEndTime(String sleepEndTime) {
+    _formItem.sleepEndTime = sleepEndTime;
+    notifyListeners();
+  }
+}