Unity多平台预处理

在开发中，特别是unity的跨平台中，我们常常会在各个平台游走，如安卓版，苹果版，PC版......。在此不同的平台上，有可能我们须要做不同的操作。然而我们就能够用unity的自带的平台宏定义方式来做平台的推断。Unity帮我们定义了例如以下平台预处理:

名称	描写叙述
UNITY_EDITOR	Define for calling Unity Editor scripts from your game code.
UNITY_STANDALONE_OSX	Platform define for compiling/executing code specifically for Mac OS (This includes Universal, PPC and Intel architectures).
UNITY_DASHBOARD_WIDGET	Platform define when creating code for Mac OS dashboard widgets.
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_IPHONE	Platform define for compiling/executing code for the iPhone platform.
UNITY_ANDROID	Platform define for the Android platform.
UNITY_PS3	Platform define for running PlayStation 3 code.
UNITY_XBOX360	Platform define for executing Xbox 360 code.
UNITY_NACL	Platform define when compiling code for Google native client (this will be set additionally to UNITY_WEBPLAYER).
UNITY_FLASH	Platform define when compiling code for Adobe Flash.

   以后我们能够依据如上宏定义就能够去轻而易举的非常easy去在我们代码中增加推断了。我举个简单样例，例如以下:

using UnityEngine;
using System.Collections;

public class Recompile : MonoBehaviour
{

    private string platform = string.Empty;
    // Use this for initialization
    void Start()
    {
        DebugPlatformMesaage();
    }

    void DebugPlatformMesaage()
    {

#if UNITY_EDITOR
        platform = "hi,大家好,我是在unity编辑模式下";
#elif UNITY_XBOX360
       platform="hi，大家好,我在XBOX360平台";
#elif UNITY_IPHONE
       platform="hi，大家好,我是IPHONE平台";
#elif UNITY_ANDROID
       platform="hi，大家好,我是ANDROID平台";
#elif UNITY_STANDALONE_OSX
       platform="hi，大家好,我是OSX平台";
#elif UNITY_STANDALONE_WIN
       platform="hi，大家好,我是Windows平台";
#endif
        Debug.Log("Current Platform:" + platform);
    }
}

上面假设我是在Editor状态下的话，就能看见打印出:     

我们也能够自定义宏定义，在PlayerSetting中定义：

比如我在上面圈起来的地方填写一个CUSTOM_ITF这个预编译指令。然后在DebugPlatformMesaage函数尾部增加这句话

//新加入的内容
#if CUSTOM_ITF
        customMsg = "我自己定义了预编译";
#endif
        Debug.Log(customMsg);

然后我们执行看下，你就能在控制台看见我们输出的信息了：

    当我们把我们自己定义的宏定义给去掉的时候，我们打印的信息就不会出来。

除了这些，unity中还有各个版本号的宏定义，一般开发插件的大牛都会用到。

UNITY_2_6	Platform define for the major version of Unity 2.6.
UNITY_2_6_1	Platform define for specific version 1 from the major release 2.6.
UNITY_3_0	Platform define for the major version of Unity 3.0.
UNITY_3_0_0	Platform define for the specific version 0 of Unity 3.0.
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 major version of Unity 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.