xcode - If/Else statement with UIKit Functions in Swift -


i'm trying figure out way have ios app save screenshot camera roll , pop alert tell user screenshot saved successfully. way can think form of if/else loop (as you'll see in pseudocode comments below), can't think of syntax work uiimagewritetosavedphotosalbum function uikit. suggestions?

func screenshotmethod() {     uigraphicsbeginimagecontextwithoptions(highchartsview.scrollview.contentsize, false, 0);     view.layer.renderincontext(uigraphicsgetcurrentcontext())     let image = uigraphicsgetimagefromcurrentimagecontext()     uigraphicsendimagecontext()      uiimagewritetosavedphotosalbum(image, nil,nil, nil)     //if saved camera roll     //            {     //              confirmscreenshot()     //            }     //             //else      //        {     //            exit code/stop      //        }   }   func confirmscreenshot() {     let alertcontroller = uialertcontroller(title: "success", message: "this chart has been saved camera roll.", preferredstyle: .alert)     let defaultaction = uialertaction(title: "ok", style: .default, handler: nil)     alertcontroller.addaction(defaultaction)      presentviewcontroller(alertcontroller, animated: true, completion: nil) }

from reference documentation can see there completiontarget , completionselector, kind of basic delegation (because not enforcing kind of protocol class has conform to, used delegation target). example implement function in class conforming specified signature defined completionselector , pass self completiontarget , name of function completionselector.

in case be:

func screenshotmethod() {     uigraphicsbeginimagecontextwithoptions(highchartsview.scrollview.contentsize, false, 0);     view.layer.renderincontext(uigraphicsgetcurrentcontext())     let image = uigraphicsgetimagefromcurrentimagecontext()     uigraphicsendimagecontext()      uiimagewritetosavedphotosalbum(image, self, "didsavescreenshot:", nil) }  func didsavescreenshot(image: uiimage?, didfinishsavingwitherror error: nserror?, contextinfo contextinfo: anyobject?)  {     if let error = error {         //not successful     } else {         //success     } }

note: did not test this, should work. thing is, not sure how port void pointer objective-c swift, feel free correct me here.


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