ios - Using SizeToFit() to Top Align UILabel Causes Jumping -


the following code works vertically align text in uilabel top-left of view box. however, causes text jump , forth between proper vertical top alignment , vertical centering. cadence of it's jumping seems of location update rate.

func locationmanager(manager: cllocationmanager!, didupdatelocations locations: [anyobject]!) {      var userlocation: cllocation = locations[0] as! cllocation      clgeocoder().reversegeocodelocation(userlocation, completionhandler: {         (placemarks, error) -> void in          if( error != nil )         {             println("error: \(error.localizeddescription)")             return         }          if( placemarks.count > 0 )         {             let placemark = placemarks[0] as! clplacemark             self.nearestaddresslabel.text = abcreatestringwithaddressdictionary(placemark.addressdictionary, false);              self.nearestaddresslabel.sizetofit()         }         else         {             println("no placemarks!")         }      }) }

gif of problem: https://imgflip.com/gif/m82jf

any idea how can avoid infernal jumping around?

update:

if using storyboard , auto layout should not use sizetofit(). sizetofit() part of "old" way, pre auto layout, , not behave expected if storyboard uses constraints.

instead in interface builder:

  • set lines 0 (allow many lines)
  • position label needed using constraints
  • add fixed constraint width
  • add contraints height using less or equal

this make sure position correct, , allow auto layout resize uilabels height needed when content updated.

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update 2:

not entirely sure why got down voted, suggested answer works. in example, using timer update label, see result:

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