ThedocumentationfortheNSApplicationMainfunction说是loadsthemainnibfilefromtheapplication’smainbundle网上建议NSApplicationMain通过查看Info.plist文件中的NSMainNibFile键找到“主要的nib文件”(被XCode混淆为“Mainnibfilebasename”)，即NSApplicationMain做类似的事情letmainBundle:Bundle=Bundle.mainletmainNibFileBaseName:String=mainBundle.inf

在XCode中创建一个新的Cocoa项目会给我一个AppDelegate.swift文件，如下所示:importCocoa@NSApplicationMainclassAppDelegate:NSObject,NSApplicationDelegate{@IBOutletweakvarwindow:NSWindow!}The@NSApplicationMainattributeisdocumentedhere作为NSApplicationMainApplythisattributetoaclasstoindicatethatitistheapplicationdelegate.Usin