使用nativescript的初始准备（2）
1.配置nativescript 开发环境
https://blog.****.net/wershest/article/details/77512634
2.解决Cannot find a compatible Android SDK for compilation. To be able to build for Android, install Android SDK 28 or later.
MAC环境Android SDK环境变量配置20180715
https://blog.****.net/jlminghui/article/details/81204352
3.解决Xcode is not installed or is not configured properly.
https://github.com/NativeScript/nativescript-cli/issues/3174
（1）首先尝试运行xcodebuild -version 检查版本，报错xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
（2）打开Xcode，并在依次打开工具栏Preferences -> Locations -> Command Line Tools
（3）再次运行xcodebuild -version
4.解决CocoaPods is not installed or is not configured properly.
xcodeproj is not installed or is not configured properly.
(1)首先pod --version，报错
(2)sudo gem install cocoapods
安装完成以后检查一遍