Issue 1:
iOS has support for changing what the return/done key on the keybaord should be labeled with...

Issue 2:
Steps to Reproduce

After upgrading flutter to the latest version I get a lot of erroneous warnings and errors when running flutter analyze. Many of the warnings are reported multiple times (the warnings seem valid though). But most disturbingly I get errors at the very start of some files:

error • Invalid constant value at lib/page_error.dart:1:1 • invalid_constant

All files has the same encoding (according to IntelliJ), and I've checked with a binary viewer xxd and there seem to be no weird invisible characters at the beginning of the affected files.

First lines of output from xxd:

00000000: 696d 706f 7274 2027 6461 7274 3a69 6f27 import 'dart:io'
00000010: 3b0a 696d 706f 7274 2027 6461 7274 3a6d ;.import 'dart:m
00000020: 6174 6827 3b0a 0a69 6d70 6f72 7420 2770 ath';..import 'p
00000030: 6163 6b61 6765 3a66 6c75 7474 6572 2f6d ackage:flutter/m

Logs

Complete output from flutter analyze:

Viktors-MacBook-Pro:Newsvoice vik$ flutter analyze
Analyzing /Users/vik/Projects/NewsVoice/NewsvoiceApp/Newsvoice...
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/page_error.dart:1:1 • invalid_constant
error • Invalid constant value at lib/page_onboarding.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widget_newsmix.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/page_category.dart:1:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/page_error.dart:1:1 • invalid_constant
error • Invalid constant value at lib/page_onboarding.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widget_newsmix.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/page_category.dart:1:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widget_newsmix.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/page_category.dart:1:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/page_error.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widget_newsmix.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/page_category.dart:1:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/page_onboarding.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widget_newsmix.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widget_newsmix.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_material.dart:1:1 • invalid_constant
error • Arguments of a constant creation must be constant expressions at lib/widgets_material.dart:1:1 • const_with_non_constant_argument
error • Invalid constant value at lib/widgets_news.dart:1:1 • invalid_constant
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
hint • Unused import at lib/widgets_comments.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
error • Invalid constant value at lib/widgets_scaffold.dart:1:1 • invalid_constant
hint • Unused import at lib/aspectorama_api.dart:4:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:5:8 • unused_import
hint • Unused import at lib/aspectorama_api.dart:13:8 • unused_import
hint • Unused import at lib/service_universal_links.dart:1:8 • unused_import
54 errors and 109 hints found.
(Ran in 5.9s)

Flutter Doctor

[✓] Flutter (on Mac OS X 10.12.3 16D32, channel master)

• Flutter at /Users/vik/Projects/flutter

• Framework revision b52d659 (14 hours ago), 2017-04-17 15:44:41 -0700

• Engine revision c24a0e5

• Tools Dart version 1.23.0-dev.11.7

[✓] Host Executable Compatibility

• Downloaded executables execute on host

[✓] Android toolchain - develop for Android devices (Android SDK 25.0.2)

• Android SDK at /Users/vik/Library/Android/sdk

• Platform android-25, build-tools 25.0.2

• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java

• Java version: OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[✓] iOS toolchain - develop for iOS devices (Xcode 8.3)

• Xcode at /Applications/Xcode.app/Contents/Developer

• Xcode 8.3, Build version 8E162

• ios-deploy 1.9.1

• CocoaPods version 1.2.0

[✓] Android Studio (version 2.3)

• Android Studio at /Applications/Android Studio.app/Contents

• Gradle version 3.2

• Java version: OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[✓] IntelliJ IDEA Community Edition (version 2016.3.4)

• Dart plugin version 163.13137

• Flutter plugin version 0.1.11.1

[✓] Connected devices

• Nexus 5X • 01023965355db590 • android-arm • Android 6.0 (API 23)