ios - UIActivity view controller crashing -


i have activity controller, crashes , dont understand why. code:

    func screenshotmethod() {     //create uiimage     let image = view?.snapshot     //save camera roll     uiimagewritetosavedphotosalbum(image, nil, nil, nil)     self.socialshare(sharingtext: "text", sharingimage: image, sharingurl:nsurl(string: "itms-apps://itunes.apple.com/app/bars/xxxxxxxx")) }   func socialshare(#sharingtext: string?, sharingimage: uiimage?, sharingurl: nsurl?) {     var sharingitems = [anyobject]()      if let text = sharingtext {         sharingitems.append(text)     }     if let image = sharingimage {         sharingitems.append(image)     }     if let url = sharingurl {         sharingitems.append(url)     }      let activityviewcontroller = uiactivityviewcontroller(activityitems: sharingitems, applicationactivities: nil)     activityviewcontroller.excludedactivitytypes = [uiactivitytypecopytopasteboard,uiactivitytypeairdrop,uiactivitytypeaddtoreadinglist,uiactivitytypeassigntocontact,uiactivitytypeposttotencentweibo,uiactivitytypeposttovimeo,uiactivitytypeprint,uiactivitytypesavetocameraroll,uiactivitytypeposttoweibo]     var currentviewcontroller:uiviewcontroller=uiapplication.sharedapplication().keywindow!.rootviewcontroller!     currentviewcontroller.presentviewcontroller(activityviewcontroller, animated: true, completion: nil)     sharebutton.alpha = 1.0 }

and here uiview snapshot extension:

extension uiview { var snapshot: uiimage {     uigraphicsbeginimagecontextwithoptions(bounds.size, false, uiscreen.mainscreen().scale)     drawviewhierarchyinrect(bounds, afterscreenupdates: true)     let result = uigraphicsgetimagefromcurrentimagecontext()     uigraphicsendimagecontext()     return result } }

and here errors getting:

thread : fatal exception: nsgenericexception 0  corefoundation                 0x25a14fef __exceptionpreprocess 1  libobjc.a.dylib                0x33e00c8b objc_exception_throw 2  uikit                          0x2970ae63 -[uipopoverpresentationcontroller presentationtransitionwillbegin] 3  uikit                          0x2934209d __71-[uipresentationcontroller _initviewhierarchyforpresentationsuperview:]_block_invoke 4  uikit                          0x29340a17 __56-[uipresentationcontroller runtransitionforcurrentstate]_block_invoke 5  uikit                          0x290e4a91 _applyblocktocfarraycopiedtostack 6  uikit                          0x2905f38f _aftercacommithandler 7  corefoundation                 0x259dafed __cfrunloop_is_calling_out_to_an_observer_callback_function__ 8  corefoundation                 0x259d86ab __cfrunloopdoobservers 9  corefoundation                 0x259d8ab3 __cfrunlooprun 10 corefoundation                 0x25925201 cfrunlooprunspecific 11 corefoundation                 0x25925013 cfrunloopruninmode 12 graphicsservices               0x2d101201 gseventrunmodal 13 uikit                          0x290c9a59 uiapplicationmain 14 void                         0x000ba600 main (appdelegate.swift:19) 15 libdyld.dylib                  0x3438caaf start

and 

thread : crashed: com.apple.main-thread 0  void                         0x0013aa90 function signature specialization <arg[0] = owned guaranteed , exploded, arg[1] = owned guaranteed, arg[2] = owned guaranteed> of a_void.gamescene.touchesmoved (a_void.gamescene)(swift.set<objectivec.nsobject>, withevent : objectivec.uievent) -> () (gamescene.swift:2036) 1  void                         0x0013a950 function signature specialization <arg[0] = owned guaranteed , exploded, arg[1] = owned guaranteed, arg[2] = owned guaranteed> of a_void.gamescene.touchesmoved (a_void.gamescene)(swift.set<objectivec.nsobject>, withevent : objectivec.uievent) -> () (gamescene.swift:2026) 2  void                         0x0010b2bc @objc a_void.gamescene.touchesmoved (a_void.gamescene)(swift.set<objectivec.nsobject>, withevent : objectivec.uievent) -> () (gamescene.swift) 3  spritekit                      0x28f0a8af -[skview touchesmoved:withevent:] + 710 4  uikit                          0x2909a46b -[uiwindow _sendtouchesforevent:] + 350 5  uikit                          0x29093df1 -[uiwindow sendevent:] + 544 6  uikit                          0x29069fe5 -[uiapplication sendevent:] + 196 7  uikit                          0x292e08fb _uiapplicationhandleeventfromqueueevent + 14414 8  uikit                          0x290689f9 _uiapplicationhandleeventqueue + 1352 9  corefoundation                 0x259dafaf __cfrunloop_is_calling_out_to_a_source0_perform_function__ + 14 10 corefoundation                 0x259da3bf __cfrunloopdosources0 + 218 11 corefoundation                 0x259d8a25 __cfrunlooprun + 772 12 corefoundation                 0x25925201 cfrunlooprunspecific + 476 13 corefoundation                 0x25925013 cfrunloopruninmode + 106 14 graphicsservices               0x2d101201 gseventrunmodal + 136 15 uikit                          0x290c9a59 uiapplicationmain + 1440 16 void                         0x0014d600 main (appdelegate.swift:19) 17 libdyld.dylib                  0x3438caaf start + 2

the app game made sprite kit, calling game method inside skscene. also, game game view controller 1 controlling game scene , embed navigation view controller, in present gamecenter. nows how fix this?


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