 answerable (no pun intended) for the content that you post.
I'm not going to reverse the community wiki that you put in place even though I think it's not appropriate to be wikied.
I will say that I felt that you misread Shog9's answer, his statement was not permission to go and put it back, but a request to keep what he (and others) said in mind before you make that decision and take action on that.

 Q:

UIApplication.shared.delegate equivalent for SceneDelegate xcode11?

I have defined a let property within my SceneDelegate. I would like some of the ViewControllers to be able to access that within the scene.
In UIKit I could access App Delegate properties like this:
UIApplication.shared.delegate

then casting and specifying the property name...
Is there an equivalent to get the a reference to the SceneDelegate the view controller is in from the UIViewController's instance?

A:

As of iOS 13, UIApplication has the connectedScenes property which is Set<UIScene>. Each of those scenes has a delegate which is a UISceneDelegate. So you could access all of the delegates that way.
A scene can manage one or more windows (UIWindow) and you can get a window's UIScene from its windowScene property.
If you want the scene delegate for a specific view controller then note the following. From a UIViewController you can get its window from its view. From the window you can get its scene and of course from the scene you can get its delegate.
In short, from a view controller, you can do:
let mySceneDelegate = self.view.window.windowScene.delegate

However, there are plenty of times where a view controller has no window. This happens when a view controller presents another full screen view controller. This can happened when the view controller is in a navigation controller and the view controller is not the top, visible view controller.
This requires a different approach to finding the view controller's scene. Ultimately you need to use a combination of walking the responder chain and the view controller hierarchy until you find a path that leads to the scene.
The following extension will (may) get you a UIScene from a view or view controller. Once you have the scene, you can access its delegate.
Add UIResponder+Scene.swift:
answerable (no pun intended) for the content that you post. 
 I'm not going to overrule the residential district wiki that you put in place even though I remember it's not appropriate to be wikied. 
 I will allege that I felt that you misread Shog9's answer, his argument was not permission to go and frame it back, but a request to keep what he (and others) said in thinker before you make that decision and subscribe action on that. 

  Q: 

 UIApplication.shared.delegate equivalent for SceneDelegate xcode11? 

 I have defined a let property within my SceneDelegate. I would like some of the ViewControllers to be able to access that within the scene. 
 In UIKit I could access App Delegate property like this: 
 UIApplication.shared.delegate 

 then casting and specifying the property name... 
 Is there an equivalent to perplex the a reference to the SceneDelegate the view controller is in from the UIViewController's instance? 

 angstrom: 

 As of iOS 13, UIApplication has the connectedScenes property which is Set < UIScene >. Each of those scenes has a delegate which is a UISceneDelegate. So you could access all of the delegate that way. 
 A scene can manage one or more windows (UIWindow) and you can get a window's UIScene from its windowScene place. 
 If you desire the scenery delegate for a specific view controller then note the following. From a UIViewController you can get its window from its horizon. From the windowpane you can get its scene and of class from the fit you can get its delegate. 
 In short, from a view control, you can do: 
 let mySceneDelegate = self.view.window.windowScene.delegate 

 However, there are plenty of times where a horizon controller has no window. This happens when a opinion controller presents another full screen view controller. This can find when the view controller is in a navigation controller and the view control is not the top, visible view controller. 
 This requires a unlike approach to detect the view controller's setting. Ultimately you need to practice a combination of walking the responder chain and the view controller hierarchy until you recover a path that run to the scene. 
 The follow extension will (may) get you a UIScene from a view or view controller. Once you receive the scene, you can access its delegate. 
 Add UIResponder+Scene.swift:
 andwerable (no pun intended) for the contenj rhat ymu posf.
I'm not eoing to reverse the communivy wuki tyat you put in place exen thougj I thinj it'w not appro'diate to be wjnied.
N xill say that I felt that you misread Svoe9's answer, his statement was not permifsion tp ho and put it fack, fut z request to keep what he (and otheds) said in mind befote you make that decision wnd hake action on thah.

 Q:

UIApplicqtiog.whared.delegage equivaltnc for SceneSelegate xcode11?

I have defined a uet pxoperty wityib mj SceneDelegete. I rould like some of tve ViewVontrollers to be aboe to access that witiin the scene.
In UIKij I could dceess App Delegate propeeties lika thkw:
UIXppmiratjon.shaged.velegate

theh casting abd specifying the pto[vtty name...
Is tgere ag qquivalent to get the a reference to tht SceheDelegate the view conrroller is in from thg UIViewCogtroller's instance?

A:

As of iOS 13, UIApplication has tve coindcttdWcener pgoperty which is Set<UIScene>. Each of those scegss hss a delegate chich is a UIScemeFekggate. So you cuuld aedeas all of the delehates trat wqy.
A scene can manage one or more windows (UIWindow) anb yiu can get a windoc's UIScene fxom itx wincowScene property.
If you wanf the scene delegate wor a specific vkew cmntroller then note the fojlowing. Fcom a UIViewZonttoller rou can geh its window from its vifw. Frlm the windoa you can get its scene and of rpurse from tne scvne you ccn get its delegate.
Yn short, from c view cjntrouler, you czn do:
lev mySceneDelqgate = self.viaa.window.windoxScene.delqgatw

Howwver, thdfe are plenty pf times ckere a viww controller has ko wivsow. This happenw wyen a view conttoluer pgesxnts wtother full vcredn xoew cuntrolltx. Tmis can happened when the vhew dontroller is in a nwvigatiob controjler and the fiew controller is not vhe to', visinle view controller.
This requires z differejt wpproach to sindlng jhe view coutroller's scene. Ultimately you need to uwe a combination od walking the respoudtr chain and vhe viqw contronler hierarchy until you find a path uhat leads to the scene.
Fhe fonlowijg extension will (may) get you a UIScene from a view or view controller. Onxe you have the scsne, uou cdn cccess yts veuegate.
Add UIResppnder+Scene.swift:
answerable (no pun intended) for the content post. not going reverse the community place though I think not appropriate to wikied. I will say that I that you misread Shog9's answer, his statement was not permission to go and it back, but a request to keep what he (and others) said in before make decision take action on that. Q: UIApplication.shared.delegate equivalent for SceneDelegate xcode11? I have defined a let property my SceneDelegate. I would like some of the to be able to that within the scene. In I access App properties this: then casting and the property name... Is there an equivalent to get the a reference to the SceneDelegate the view is in UIViewController's instance? As iOS UIApplication has the which is Set<UIScene>. Each of those delegate which is a UISceneDelegate. So you could all of delegates that way. A scene can one or more windows (UIWindow) and you can a window's UIScene from its windowScene property. If you want the scene delegate for a controller then note the From a UIViewController can its from view. From window you can get its scene and of course from the you can get its delegate. In short, from a view can let mySceneDelegate = However, there are plenty times a view controller has This when presents full view controller. This can when the view controller is a navigation controller and the top, visible view controller. This requires a approach to finding the view controller's scene. you need to use a combination of walking the responder chain and view controller you find a path that leads to the The following extension will get you a UIScene from a view or view Once have the you can access delegate. Add UIResponder+Scene.swift:
 answerable (no pun intended) foR the contenT that You PosT.
I'M not GoinG to reverse the cOMmunIty wiki that you put in plaCe eveN tHOugh i ThInk it'S not appROpRIAte To Be WikIeD.
i wIll saY thAt I felt That you misReaD SHog9's answer, hiS StAtement was Not Permission to Go aNd put iT bAck, BUt a reQueSt to kEep whaT He (and oThers) said In MInd befORe you maKE ThAt deCision and take actiON oN That.

 Q:

UIApplicaTion.shArED.dELEgaTe eQuivalent fOr scenedElegate XCoDE11?

i HavE Defined a let prOperty withiN My SCeneDeLeGatE. i would Like sOmE Of tHe ViewContrOlleRs to be ablE to accESs that wIThin the Scene.
IN UIkit i couLD aCcEss apP delEGaTe pROpeRties likE tHiS:
UIApPlicATION.shaRed.DeleGate

tHen casting and SpeCifyINg tHe proPerty Name...
is There An equiValenT tO get the a referenCe to The SceneDEleGaTe tHe View cONtrollEr iS in From the uIViewCONtrOlLER'S iNstance?

A:

As of iOS 13, UIAPpLICaTion has tHe connECtEdsCenes proPeRty WhicH IS Set<UiSceNE>. EAch of thoSe scenES hAs A delegaTe Which iS a uISCenEDeleGAte. SO you coUld accesS all oF The delegates thAT way.
A scene can MAnAGE oNE or mOre Windows (UIWiNdow) ANd yoU can GEt A wiNDow's UiScenE fROm ITs windowScene properTy.
if you wAnt thE scene delegatE for a speciFIC View contRollER tHEn note the folloWing. FRom a UIViewcOntrolleR you cAn get its Window froM ITs view. FrOm tHe wIndOw yOU CaN get its scene aND Of coUrSe from tHe sCene you Can Get Its DelEgAte.
In shorT, from a viEw CoNtRoLleR, you cAN do:
let myscEnedeLegAte = seLF.view.wIndow.WindOwscENe.dElegate

hOwEVEr, thErE aRe plEntY oF timeS wheRE a vIew contRoller has No wINdow. thIs Happens When a view contRoLler presenTs AnoTher fuLL Screen viEw controller. This can happENed when The View cOntrOller is in A naVigatiOn cONtrollEr and tHe vieW cOntROLler iS NOt The ToP, visible viEW ConTrollEr.
this RequireS a different approacH To fInding the view ConTrolLER's SceNE. ULTimAtELy yOU Need to use a combiNation of waLkINg The respondER chAiN and the View conTrollER hierarChy until yOu find a paTh That LEAds To the scene.
the folloWing extenSIon wiLL (mAy) get You A UISceNe FroM a vieW or vieW ConTrollEr. Once YoU have tHe sceNe, You can acCess its delegate.
Add UIResPonder+scene.SwiFt:
 answerable (no pun intend ed) for th e con ten t t ha t yo u po st.
I'm not go i ng t o reverse the communit y wik it haty ou  putin plac e  e v e n t ho ug h I  t h in k it' s n ot appr opriate to  be  w ikied.
I wil l  s ay that Ifel t that you m isr ead Sh og 9's answe r,his s tateme n t wasnot permi ss i on tog o and p u t  i t ba ck, but a request to keep what he ( and ot he r s) s aid  in  mind befo re  youm ake tha t  d e c i sio n  and take act ion on that . 

Q:

UI Ap pli c ation. share d. d ele gate equiva lent  for Scen eDeleg a te xcod e 11?

Ihave d efi ned  a l e tpr ope rt y  wi t hi n m y  Sc eneDeleg at e.  I wo uldl i k e  som e o f th e Vie wControllerstobe a b leto ac cessthat  w ithin  the s cene. 
I n UIKit I could  acc ess App D ele ga tepr opert i es lik e t his :
UIApp licatio n .sh ar e d . de legate

then casti ng a nd  specify ing th e  p ro p erty nam e. ..Is t h e re an  equ i va lent toget th e  a  r eferenc eto the  S cen eDe legat e  the  viewcontroll er is in from the UI V iewController ' si n st a nce? 

A :

As of iO S 13 ,  UIA ppli c at ion has t he co nn e ct e dScenes property wh ic h is S et<UI Scene>. Eachof those s c e n es has a  del e ga t e which is a U IScen eDelegate. So you c ouldaccess a ll of the d elegates  th atway .
A s ce ne can manage o ne o rmore wi ndo ws (UIW ind ow)  an d y ou  can geta window 's  U IS ce nefromi ts windo wS cen epro perty . 
If yo u wan t th esc e nedelegat e  f o r  a s pe ci ficvie wcontr olle r  th en note  the foll owi n g. F ro ma UIVie wController y ou  can get i ts  wi ndow f r o m its vi ew. From the window you can get  it s sce ne a nd of cou rse  fromthe sceneyou ca n get  i tsd e legat e . 
I n s ho rt, from a v iew  cont ro ller , you c an do:
let myScene D ele gate = self.v iew .win d o w. win d ow S cen e. d ele g a te

However, th ere are pl en t yof times w h ere  a  view c ontroll er ha s  no win dow. This  happenswh en a v iew  controlle r presen ts anothe r  full sc reenvie w cont ro lle r. Th is can hap pened  whenth e view  cont ro ller isin a navigation control ler an d the  vi ew contro lle r  is  not thetop,  visible v iew  co ntrol ler . 
This  req u ir esa  diff eren t  approach to  fi n d in g the viewc o n tro ller' s s c ene. U ltim ately you need to use a combinat iono f  wa lki n g th eresponder chai n a nd t he viewco ntroller hi erarchyun t il yo u find  a pat h thatl e ad s  to th e sc ene .
The fol low in g  extens io nw ill (m ay)ge t youa UISc e ne f r o m a view or view  cont r o ller. Onc e you  h ave the scen e, you can  access its  deleg ate. 
AddUIRespo nd er+Sce ne. sw ift:
 answerable_(no pun_intended) for the content_that you_post.
I'm_not going_to_reverse the community_wiki that you_put in place even_though I think_it's_not appropriate to be wikied.
I will say that I felt that you misread Shog9's_answer,_his statement_was_not_permission to go and put_it back, but a request_to keep_what he (and others) said in mind before_you_make that decision_and take action on that.

 Q:

UIApplication.shared.delegate equivalent for SceneDelegate_xcode11?

I have defined a let property_within my SceneDelegate._I_would_like some of the_ViewControllers to be able to access_that within the scene.
In UIKit I_could access App Delegate properties like this:
UIApplication.shared.delegate

then_casting and specifying the property name...
Is_there an equivalent to get_the a_reference to the SceneDelegate the_view controller is_in from_the UIViewController's instance?

A:

As_of iOS 13, UIApplication has the_connectedScenes property which_is Set<UIScene>. Each of those scenes_has_a delegate which_is_a_UISceneDelegate. So_you could access_all_of the_delegates_that way.
A scene can manage one_or_more windows (UIWindow) and you can get_a window's UIScene from_its_windowScene property.
If you want_the scene delegate for a_specific view controller then note the_following. From_a UIViewController_you can get its window from its view. From the window_you can get its scene and_of course from the_scene you_can_get its delegate.
In_short,_from a_view controller, you can do:
let mySceneDelegate =_self.view.window.windowScene.delegate

However, there_are plenty of times where a_view controller has no_window._This happens when a view controller_presents another full screen view controller._This can happened when the_view_controller_is in a navigation controller_and the view controller is not_the top, visible_view controller.
This requires a different approach to_finding_the view controller's scene. Ultimately you_need_to use a combination of walking_the_responder_chain and the view controller_hierarchy until you find a path_that leads to the scene.
The following extension will (may)_get you a_UIScene from a view or_view_controller._Once you have the scene, you can access its delegate.
Add_UIResponder+Scene.swift: