wait for finished asynchronous process for getting current location in iOS app -

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i current location of ios device in app using cllocationmanager , cllocation. works fine me. delivered location params latitude , longitude want use self created function. problem function getting current location runs in asynchronous process , not finished while starting next function.

i use delegates in view controller getting current location.

here code in swift:

var latitude:cllocationdegrees = 0.0 var longitude:cllocationdegrees = 0.0  override func viewdidload() {     super.viewdidload()      //get current location , set vars latitude , logitude right values     self.getcurrentlocation()      //compute distance current location given location     //the result of getcurrentlocation() still not exists @ time     //latitude , longitude still have value 0.0 , not real value set getcurrentlocation()     self.computedistancetogivenlocation(anotherlatitude: 10.0, anotherlogitude: 15.0) }

how possible wait until function getcurrentlocation() finished before going on in code next function self.computedistancetogivenlocation()?

i think use closures/blocks this. see many of these in cocoa frameworks names completionhandler.

so modify getcurrentlocation() method in way, takes closure/block argument. block contains self.computedistancetogivenlocation() call. @ end of getcurrentlocation() use closure/block. syntax bit tricky , haven't start swift yet. here documentation.

but i'm not sure, getcurrentlocation() does. telling location manager start updating location? should think calling computedistancetogivenlocation() directly delegate method, because way, can 100% sure location data there.


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