Objective-C中的单例，用于存储和访问程序范围内的变量。几个问题

I am using Apple's MyGizmoClass Singleton class for program-wide "session variables" and loving it! However, when I run "Build and Analyze" it gives weird results. Maybe my usage is wrong (it works, but it may be working due to a flakey side effect). Here is an example.I am using Apple's MyGizmoClass Singleton class