ios - How to pass a value from a delegate to another one in swift? -


i want pass url in documentpicker previewcontroller. since of them delegates, can't return because violate protocol. how pass data view view? thanks!

func previewcontroller(controller: qlpreviewcontroller!, previewitematindex index: int) -> qlpreviewitem! {     //var doc = nsurl(fileurlwithpath: url)     return doc } func documentpicker(controller: uidocumentpickerviewcontroller, didpickdocumentaturl url: nsurl) {     println("\(url)")     var quickview = qlpreviewcontroller()     quickview.datasource = self     presentviewcontroller(quickview, animated: true, completion: nil) }

~~~~~~~~~~~update~~~~~~~~~6.2~~~~~~~~~~~~~~ follow idea of answer follow

func documentpicker(controller: uidocumentpickerviewcontroller, didpickdocumentaturl url: nsurl) {     println("\(url)")      var a: string = "\(url)"      nsuserdefaults.standarduserdefaults().setobject(a, forkey: "url")      var quickview = qlpreviewcontroller()       quickview.datasource = self      presentviewcontroller(quickview, animated: true, completion: nil)     }

and

func previewcontroller(controller: qlpreviewcontroller!, previewitematindex index: int) -> qlpreviewitem!{      var  url = nsuserdefaults.standarduserdefaults().objectforkey("url") as! string     var doc = nsurl(fileurlwithpath: url)     return doc }

by doing avoid format issue of nsuserdefaults, program still break @ doc (thread 1: breakpoint 1.1)

for example, when run , select file, url file:///private/var/mobile/containers/data/application/dee5190d-6e3f-4400-8866-4668b830c588/tmp/documentpickerincoming/experiment_7.pdf

and doc : optional(file:/private/var/mobile/containers/data/application/dee5190d-6e3f-4400-8866-4668b830c588/tmp/documentpickerincoming/experiment_7.pdf -- file:///)

they same. why app break?

well can store url in nsuserdefaults. , use whenever want. can store text in nsuserdefaults

func documentpicker(controller: uidocumentpickerviewcontroller, didpickdocumentaturl url: nsurl) { println("\(url)")  nsuserdefaults.standarduserdefaults().setobject(url, forkey: "url")  var quickview = qlpreviewcontroller()   quickview.datasource = self  presentviewcontroller(quickview, animated: true, completion: nil)  }

and retrieve in 

func previewcontroller(controller: qlpreviewcontroller!, previewitematindex index: int) -> qlpreviewitem! {  var doc = nsuserdefaults.standarduserdefaults().objectforkey("url") as! nsurl return doc }

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