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unity中提供的TextEditor类，只能在windows环境下使用，对于安卓和iOS，就不得不使用原生代码了

在unity中使用宏区分下平台：

public void CopyToClipboard(string input)  
{  

#if UNITY_EDITOR
TextEditor t = new TextEditor();
t.text = input;
t.OnFocus();
t.Copy();
#elif UNITY_IPHONE
CopyTextToClipboard_iOS(input);
#elif UNITY_ANDROID
AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
AndroidJavaObject currentActivity = unityPlayer.GetStatic("currentActivity");
AndroidJavaClass tool = new AndroidJavaClass("com.my.ugcf.Tool");
tool.CallStatic("CopyTextToClipboard", currentActivity, input);
#endif
}

java：

public static void CopyTextToClipboard(final Context activity, final String str) throws Exception {  
    if (Looper.myLooper() == null){  
        Looper.prepare();  
    }  
    clipboard = (ClipboardManager) activity.getSystemService(Activity.CLIPBOARD\_SERVICE);  
    ClipData textCd = ClipData.newPlainText("data", str);  
    clipboard.setPrimaryClip(textCd);  
}

objective-c：

　　void CopyTextToClipboard_iOS(const char *text)
{
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
pasteboard.string = _CreateNSString(text);
}