1 swift 2 3 var alert:NSAlert = NSAlert() 4 alert.messageText = "警告"alert.addButtonWithTitle("好") 5 alert.alertStyle = NSAlertStyle.CriticalAlertStyle 6 7 // 滑出式 8 alert.beginSheetModalForWindow(window,completionHandler:nil) 9 10 // 弹出式 11 alert.runModal() 12 13 14 15 16 17 //OC 18 19 NSAlert *alert = [NSAlert alertWithMessageText:@"提示" defaultButton:@"明白" alternateButton:nil otherButton:nil informativeTextWithFormat:@"用户名或者密码不能为空！"]; 20 [alert runModal];