Issue 1:
I/flutter ( 5612): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 5612): The following assertion was thrown building MapPage(dirty, state: _MapPageState#7a02d):
I/flutter ( 5612): 'file:///C:/Flutter/flutter/.pub-cache/git/plugins-3897d4305492d658ed5a22570cbe36f3cb2ee73e/packages/google_maps_flutter/lib/src/google_map.dart':
I/flutter ( 5612): Failed assertion: line 24 pos 15: 'initialCameraPosition != null': is not true.
I/flutter ( 5612):
I/flutter ( 5612): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter ( 5612): more information in this error message to help you determine and fix the underlying cause.
I/flutter ( 5612): In either case, please report this assertion by filing a bug on GitHub:
I/flutter ( 5612): https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter ( 5612):
I/flutter ( 5612): When the exception was thrown, this was the stack:
I/flutter ( 5612): #2 new GoogleMap (file:///C:/Flutter/flutter/.pub-cache/git/plugins-3897d4305492d658ed5a22570cbe36f3cb2ee73e/packages/google_maps_flutter/lib/src/google_map.dart:24:15)
I/flutter ( 5612): #3 _MapPageState.build (package:tracking_systems/pages/home_page.dart:22:20)
I/flutter ( 5612): #4 StatefulElement.build (package:flutter/src/widgets/framework.dart:3809:27)
I/flutter ( 5612): #5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3721:15)
I/flutter ( 5612): #6 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #7 StatefulElement.update (package:flutter/src/widgets/framework.dart:3878:5)
I/flutter ( 5612): #8 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #9 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #12 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #13 StatelessElement.update (package:flutter/src/widgets/framework.dart:3781:5)
I/flutter ( 5612): #14 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #15 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #16 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #17 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #18 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #19 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #20 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #21 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #22 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #23 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #24 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #25 StatefulElement.update (package:flutter/src/widgets/framework.dart:3878:5)
I/flutter ( 5612): #26 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #27 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #28 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #29 StatelessElement.update (package:flutter/src/widgets/framework.dart:3781:5)
I/flutter ( 5612): #30 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #31 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #32 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #33 StatefulElement.update (package:flutter/src/widgets/framework.dart:3878:5)
I/flutter ( 5612): #34 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #35 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #36 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #37 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #38 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #39 ProxyElement.update (package:flutter/src/widgets/framework.dart:3990:5)
I/flutter ( 5612): #40 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #41 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #42 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #43 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #44 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #45 StatefulElement.update (package:flutter/src/widgets/framework.dart:3878:5)
I/flutter ( 5612): #46 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #47 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #48 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #49 StatelessElement.update (package:flutter/src/widgets/framework.dart:3781:5)
I/flutter ( 5612): #50 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #51 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:4867:14)
I/flutter ( 5612): #52 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #53 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #54 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #55 ProxyElement.update (package:flutter/src/widgets/framework.dart:3990:5)
I/flutter ( 5612): #56 Element.updateChild (package:flutter/src/widgets/framework.dart:2742:15)
I/flutter ( 5612): #57 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
I/flutter ( 5612): #58 Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
I/flutter ( 5612): #59 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2286:33)
I/flutter ( 5612): #60 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:676:20)
I/flutter ( 5612): #61 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:219:5)
I/flutter ( 5612): #62 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
I/flutter ( 5612): #63 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
I/flutter ( 5612): #64 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:751:7)
I/flutter ( 5612): #66 _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
I/flutter ( 5612): #67 _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
I/flutter ( 5612): #68 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)
I/flutter ( 5612): (elided 3 frames from class _AssertionError and package dart:async)

Issue 2:
I want a landscape page in my app

use this code

@override
void initState() {
super.initState();
SystemChrome.setPreferredOrientations([
DeviceOrientation.landscapeRight,
DeviceOrientation.landscapeLeft,
]);
}

in android, it works well. app could auto landscape.but it doesn't work in ios.

i must horizontally iphone to make it work.

bug?