在objc中，我可以获得NSPopUpButton的selectedItem、titleOfSelectedItem和indexOfSelectedItem:-(IBAction)myPopUpButton:(id)sender{NSLog([senderselectedItem]);//worksNSLog([sendertitleOfSelectedItem]);//worksNSLog([senderindexOfSelectedItem]);//works}在swift中，我可以获得selectedItem和titleOfSelectedItem但不是NSPopUpButton