unity 平臺控制宏

Property:	Function:
UNITY_EDITOR	Define for calling Unity Editor scripts from your game code.
UNITY_EDITOR_WIN	Platform define for editor code on Windows.
UNITY_EDITOR_OSX	Platform define for editor code on Mac OSX.
UNITY_STANDALONE_OSX	Platform define for compiling/executing code specifically for Mac OS (This includes Universal, PPC and Intel architectures).
UNITY_STANDALONE_WIN	Use this when you want to compile/execute code for Windows stand alone applications.
UNITY_STANDALONE_LINUX	Use this when you want to compile/execute code for Linux stand alone applications.
UNITY_STANDALONE	Use this to compile/execute code for any standalone platform (Mac, Windows or Linux).
UNITY_WEBPLAYER	Platform define for web player content (this includes Windows and Mac Web player executables).
UNITY_WII	Platform define for compiling/executing code for the Wii console.
UNITY_IOS	Platform define for compiling/executing code for the iOS platform.
UNITY_IPHONE	Deprecated. Use UNITY_IOS instead.
UNITY_ANDROID	Platform define for the Android platform.
UNITY_PS3	Platform define for running PlayStation 3 code.
UNITY_PS4	Platform define for running PlayStation 4 code.
UNITY_XBOX360	Platform define for executing Xbox 360 code.
UNITY_XBOXONE	Platform define for executing Xbox One code.
UNITY_BLACKBERRY	Platform define for a Blackberry10 device.
UNITY_TIZEN	Platform define for the Tizen platform.
UNITY_WP8	Platform define for Windows Phone 8.
UNITY_WP8_1	Platform define for Windows Phone 8.1.
UNITY_WSA	Platform define for Windows Store Apps (additionally NETFX_CORE is defined when compiling C# files against .NET Core).
UNITY_WSA_8_0	Platform define for Windows Store Apps when targeting SDK 8.0.
UNITY_WSA_8_1	Platform define for Windows Store Apps when targeting SDK 8.1.
UNITY_WSA_10_0	Platform define for Windows Store Apps when targeting Universal Windows 10 Apps (additionally WINDOWS_UWP and NETFX_CORE is defined when compiling C# files against .NET Core).
UNITY_WINRT	Equivalent to UNITY_WP8 | UNITY_WSA.
UNITY_WINRT_8_0	Equivalent to UNITY_WP8 | UNITY_WSA_8_0.
UNITY_WINRT_8_1	Equivalent to UNITY_WP_8_1 | UNITY_WSA_8_1. It’s also defined when compiling against Universal SDK 8.1.
UNITY_WINRT_10_0	Same as UNITY_WSA_10_0
UNITY_WEBGL	Platform define for WebGL.

Also you can compile code selectively depending on the version of the engine you are working on. Currently the supported ones are:

UNITY_2_6	Platform define for the major version of Unity 2.6.
UNITY_2_6_1	Platform define for specific version 2.6.1.
UNITY_3_0	Platform define for the major version of Unity 3.0.
UNITY_3_0_0	Platform define for specific version 3.0.0.
UNITY_3_1	Platform define for major version of Unity 3.1.
UNITY_3_2	Platform define for major version of Unity 3.2.
UNITY_3_3	Platform define for major version of Unity 3.3.
UNITY_3_4	Platform define for major version of Unity 3.4.
UNITY_3_5	Platform define for major version of Unity 3.5.
UNITY_4_0	Platform define for major version of Unity 4.0.
UNITY_4_0_1	Platform define for specific version 4.0.1.
UNITY_4_1	Platform define for major version of Unity 4.1.
UNITY_4_2	Platform define for major version of Unity 4.2.
UNITY_4_3	Platform define for major version of Unity 4.3.
UNITY_4_5	Platform define for major version of Unity 4.5.
UNITY_4_6	Platform define for major version of Unity 4.6.
UNITY_5_0	Platform define for major version of Unity 5.0.