ios - Sending an on-the-fly created QR Code UIImage by AirDrop fails -

i creating qr code on fly , storing uiimage. want able send using uiactivityviewcontroller somehow fails:

func generateqrcode(from string: string) -> uiimage? {     let data = string.data(using: string.encoding.ascii)      if let filter = cifilter(name: "ciqrcodegenerator") {         filter.setvalue(data, forkey: "inputmessage")         let transform = cgaffinetransform(scalex: 3, y: 3)          if let output = filter.outputimage?.applying(transform) {             return uiimage(ciimage: output)         }     }      return nil } 

and calling function , store uiimage:

let image = generateqrcode(from: "create code") imgqrcode.image = image 

the export button uses following action:

@ibaction func sharebuttonclicked(sender: uibutton) {          let objectstoshare = [imgqrcode.image!] [anyobject]         let activityvc = uiactivityviewcontroller(activityitems: objectstoshare, applicationactivities: nil)          activityvc.popoverpresentationcontroller?.sourceview = sender         self.present(activityvc, animated: true, completion: nil)  } 

after choosing send via airdrop mac app crashes

2016-11-05 23:29:15.912242 ordnung[3945:888442] cgcontextscalectm: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. 

nov 5 23:29:15 ordnung[3945] : cgcontextscalectm: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable.

2016-11-05 23:29:15.912396 ordnung[3945:888442] cgcontexttranslatectm: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. nov  5 23:29:15  ordnung[3945] <error>: cgcontexttranslatectm: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. 2016-11-05 23:29:15.912584 ordnung[3945:888442] cgcontextconcatctm: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. nov  5 23:29:15  ordnung[3945] <error>: cgcontextconcatctm: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. 2016-11-05 23:29:15.912692 ordnung[3945:888442] cgcontextdrawimage: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. nov  5 23:29:15  ordnung[3945] <error>: cgcontextdrawimage: invalid context 0x0. if want see backtrace, please set cg_context_show_backtrace environmental variable. 2016-11-05 23:29:15.927580 ordnung[3945:888442] [airdrop] sender ksfoperationeventerroroccured {     error = "error domain=sfoperation code=-5 \"die \u00dcbertragung ist fehlgeschlagen, da du eine ung\u00fcltige datei senden wolltest.\" userinfo={nslocalizeddescription=die \u00dcbertragung ist fehlgeschlagen, da du eine ung\u00fcltige datei senden wolltest.}";     sessionid = 76fbe80074fc; } 

does have idea on how done?

cheers maik

it seems need provide image in different way, altering qr code generation way solves problem creating cgimage before creating uiimage:

func generateqrcode(from string: string) -> uiimage? {     let cicontext = cicontext()     let data = string.data(using: string.encoding.ascii)      if let filter = cifilter(name: "ciqrcodegenerator") {         filter.setvalue(data, forkey: "inputmessage")         let transform = cgaffinetransform(scalex: 3, y: 3)         let upscaledimage = filter.outputimage?.applying(transform)           let cgimage = cicontext.createcgimage(upscaledimage!,                                               from: upscaledimage!.extent)         qrcodeimage = uiimage(cgimage: cgimage!)         return qrcodeimage     }     return nil } 

and additionally should use png or jpg representation of image:

func share() {     let png = uiimagepngrepresentation(qrcodeimage)     let vc = uiactivityviewcontroller(activityitems: [png!], applicationactivities: [])     present(vc, animated: true) }