ios - AddObserver on UILabel not working -


i trying notifications whenever text changes in uilabel can resize fit new text. here code:

public class messagecontainer : uilabel {     private readonly int _width;      public messagecontainer(int width)     {         _width = width;         textalignment = uitextalignment.center;         font = uifont.preferredtitle1;         textcolor = uicolor.white;         lines = 999;          this.addobserver("text", foundation.nskeyvalueobservingoptions.initial | foundation.nskeyvalueobservingoptions.new, textchanged);     }      private void textchanged(foundation.nsobservedchange change)     {         var s = change.newvalue foundation.nsstring;          if (s != null) // s null here         {             var size = s.stringsize(uifont.preferredtitle1, new cgsize(_width - 20, 999), uilinebreakmode.characterwrap);             this.resizeframe(size.width, size.height);         }     } }

my textchanged function gets called, change.newvalue null. using xamarin.ios, i'm sure answer same in objective-c or swift.

here simple subclass uilabel delegate tell when text changes:

class mylabel: uilabel {     var delegate: mylabeldelegate?     override var text: string {         willset(string) {             delegate?.willset(self, text: string)         }     } }  protocol mylabeldelegate {     func willset(_ label: mylabel, text: string) }

i did on phone, it’s not tested, should work.


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