问如何从Cocoa中的应用程序名称中获取Bundle Identifier？

EN

extension Bundle {
    class func bundleIDFor(appNamed appName: String) -> String? {
        if let appPath = NSWorkspace.shared.fullPath(forApplication: appName) {
            if let itsBundle = Bundle(path: appPath) { // < in my build this condition fails if we're looking for the ID of the app we're running...
                if let itsID = itsBundle.bundleIdentifier {
                    return itsID
                }
            } else {
                //Attempt to get the current running app.
                //This is probably too simplistic a catch for every single possibility
                if let ownID =  Bundle.main.bundleIdentifier {
                    return ownID
                }
            }
        }
        return nil
    }
}

let id = Bundle.bundleIDFor(appNamed: "Mail.app")

let id = Bundle.bundleIDFor(appNamed: "Mail")

func bundleIdentifierForApplicationName(appName : String) -> String
{
    var workspace = NSWorkspace.sharedWorkspace()
    var appPath : String = workspace.fullPathForApplication(appName)
    if (appPath != "") {
        var appBundle : NSBundle = NSBundle(path:appPath)
     return appBundle.bundleIdentifier
    }
   return ""
}