objective c - View not updating when it's properties change in custom delegate -

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i have acpdownloadview instance of appdelegate. it's showing downloading progress. when update it's progress value in view controller, works fine. 

appdelegate.downloadvew=[[acpdownloadview alloc] initwithframe:cgrectmake(0, 0, 30, 30)]; appdelegate.downloadvew.backgroundcolor=[uicolor clearcolor]; progressbtn= [[uibarbuttonitem alloc] initwithcustomview:appdelegate.downloadvew]; acpindeterminategooglelayer * layer = [acpindeterminategooglelayer new]; [layer updatecolor:[uicolor bluecolor]]; [appdelegate.downloadvew setindeterminatelayer:layer]; [appdelegate.downloadvew setindicatorstatus:acpdownloadstatusrunning]; [appdelegate.downloadvew setprogress:0.0 animated:no];

now, have delegate method called when progress updated.

 -(void)progressaddchannel:(nsprogress *)uploadprogress{        float prog=uploadprogress.fractioncompleted;        [appdelegate.downloadvew setprogress:prog animated:yes];      [appdelegate.downloadvew layoutifneeded];      nslog(@"%f",prog);

}

this code executes , show correct value of progress. progress not animating on appdelegate.downloadvew. know behavior?

since making ui changes make sure code runs on main thread.


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