iOS implementation

example/pubspec.lock

@@ -1,6 +1,20 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.10"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.2"
   async:
     dependency: transitive
     description:
@@ -8,13 +22,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.3.0"
-  just_audio:
-    dependency: "direct dev"
-    description:
-      path: ".."
-      relative: true
-    source: path
-    version: "0.0.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -36,6 +43,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.14.11"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.1"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -53,6 +74,20 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  image:
+    dependency: transitive
+    description:
+      name: image
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.4"
+  just_audio:
+    dependency: "direct dev"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "0.0.1"
   matcher:
     dependency: transitive
     description:
@@ -88,6 +123,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0+1"
+  petitparser:
+    dependency: transitive
+    description:
+      name: petitparser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.4.0"
   platform:
     dependency: transitive
     description:
@@ -170,6 +212,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.8"
+  xml:
+    dependency: transitive
+    description:
+      name: xml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.5.0"
 sdks:
-  dart: ">=2.2.2 <3.0.0"
+  dart: ">=2.4.0 <3.0.0"
   flutter: ">=1.9.1+hotfix.5 <2.0.0"