1、Unity调用iOS:
1.1、在Unity C#中：
[ DllImport( "__Internal" )]
private static extern int _showSelectTitleDialog ( string title, string msg);
1.2、在Xcode Objective-C中：
extern "C" { int _showSelectTitleDialog(const char *title, const char *msg) { return [[UNDialogManager sharedManager] showSelectDialog:[NSString stringWithUTF8String:title] message:[NSString stringWithUTF8String:msg]]; } }
2、在iOS中调用Unity:
2.1、在Xcode Objective-C中：
UnitySendMessage("DialogManager", "OnCancel", tag.UTF8String);
2.2、在Unity C#中：
public void OnCancel ( string idStr)
{
int id = int.Parse (idStr); if (_delegates.ContainsKey (id)) { _delegates [id] (-1); _delegates.Remove (id); Debug.LogWarning ( "===OnCancel idStr1:" + idStr); } else { Debug.LogWarning ( "===OnCancel idStr2:" + idStr); } }
参考资料：
http://docs.unity3d.com/Manual/PluginsForIOS.html