ios - UIViewControllerAnimatedTransitioning: screen keeps getting black under custom view -


i have found many related topics on (and elsewhere) still couldn't find solution problem. want display custom alert on view using uiviewcontrollertransitioningdelegate. first, in initial view controller, here call:

@ibaction func tappedbutton(_ sender: any) {      myalertviewcontroller.presentin(viewcontroller: self) }

and here code of myalertviewcontroller:

import uikit  open class myalertviewcontroller: uiviewcontroller, uiviewcontrollertransitioningdelegate {      @iboutlet weak var overlayview: uiview?     @iboutlet weak var alertview: uiview?     @iboutlet weak var alertcenteryconstraint: nslayoutconstraint?      public override init(nibname nibnameornil: string?, bundle nibbundleornil: bundle?) {         super.init(nibname: "myalertview", bundle: nil)         self.transitioningdelegate = self     }      required public init?(coder adecoder: nscoder) {         fatalerror("init(coder:) has not been implemented")     }      static func presentin(viewcontroller: uiviewcontroller) {         let alertviewcontroller = myalertviewcontroller()          if thread.ismainthread {              viewcontroller.present(alertviewcontroller, animated: true, completion: nil)         } else {             dispatchqueue.main.async {                 viewcontroller.present(alertviewcontroller, animated: true, completion: nil)             }         }     }      public func animationcontroller(fordismissed dismissed: uiviewcontroller) -> uiviewcontrolleranimatedtransitioning? {         return mydismissalertviewanimationcontroller()     }      public func animationcontroller(forpresented presented: uiviewcontroller, presenting: uiviewcontroller, source: uiviewcontroller) -> uiviewcontrolleranimatedtransitioning? {         return mypresentalertviewanimationcontroller()     } }  class mypresentalertviewanimationcontroller: nsobject, uiviewcontrolleranimatedtransitioning {     public func transitionduration(using transitioncontext: uiviewcontrollercontexttransitioning?) -> timeinterval {         return 0.3     }      public func animatetransition(using transitioncontext: uiviewcontrollercontexttransitioning) {         let toviewcontroller: myalertviewcontroller = transitioncontext.viewcontroller(forkey: uitransitioncontextviewcontrollerkey.to) as! myalertviewcontroller         let duration = self.transitionduration(using: transitioncontext)          let containerview = transitioncontext.containerview         toviewcontroller.view.frame = containerview.frame         containerview.addsubview(toviewcontroller.view)          toviewcontroller.overlayview?.alpha = 0.0         uiview.animate(withduration: duration, animations: {             toviewcontroller.overlayview?.alpha = 0.6         })          let finishframe = toviewcontroller.alertview?.frame         var startingframe = finishframe         startingframe?.origin.y = -((finishframe?.height)!)         toviewcontroller.alertview?.frame = startingframe!          uiview.animate(withduration: 0.5, delay: 0.0, usingspringwithdamping: 0.7, initialspringvelocity: 1.0, options: .layoutsubviews, animations: {             toviewcontroller.alertview?.frame = finishframe!         }, completion: { result in             transitioncontext.completetransition(result)         })     } }  class mydismissalertviewanimationcontroller: nsobject,  uiviewcontrolleranimatedtransitioning {     public func transitionduration(using transitioncontext: uiviewcontrollercontexttransitioning?) -> timeinterval {         return 0.3     }      public func animatetransition(using transitioncontext: uiviewcontrollercontexttransitioning) {         let fromviewcontroller: myalertviewcontroller = transitioncontext.viewcontroller(forkey: uitransitioncontextviewcontrollerkey.from) as! myalertviewcontroller         let duration = self.transitionduration(using: transitioncontext)          uiview.animate(withduration: duration, animations: {             fromviewcontroller.overlayview?.alpha = 0.0         })          var finishframe = fromviewcontroller.alertview?.frame         finishframe?.origin.y = -(finishframe?.height)!         finishframe?.origin.y = fromviewcontroller.isdismissingbybottom ? fromviewcontroller.view.frame.size.height : -(finishframe?.height)!          uiview.animate(withduration: duration, delay: 0.0, usingspringwithdamping: 1.0, initialspringvelocity: 1.0, options: .layoutsubviews, animations: {             fromviewcontroller.alertview?.frame = finishframe!         }, completion: { result in             transitioncontext.completetransition(true)         })     } }

the animation works fine, black screen appears after call completetransition() can see below:

enter image description here

thanks help...

i think need either set background color so:

self.view.backgroundcolor = .clear

this make sure background see not background color of modal.

or prevent presenting view controller removed screen making modal presentation style overcurrentcontext 

self.modalpresentationstyle = .overcurrentcontext

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