ios - Flickering Section Headers when it refreshes? -


i have a series of uitableviewcells update every second or so.

first attempt: in order perform such update, call self.tableview.reloaddata() reload cell contents.

second attempt: have tried refreshing sections uitableviewanimation.none makes section header disappear , reappear every second.

in first attempt, "flickering" effect because views being refreshed. want flickering effect goes away. in second attempt, said above, section header disappear , reappear every second.

in code, want update headerview.headertimeleft.text label.

here attempts:

override func viewdidappear(animated: bool) {     super.viewdidappear(animated)     self.refreshtimer = nstimer.scheduledtimerwithtimeinterval(1.0, target: self, selector: "refreshview:", userinfo: nil, repeats: true) }  func refreshview(timer: nstimer){     //attempt 2     var visiblerows:nsarray = self.tableview.indexpathsforvisiblerows()!     var sections = nsmutableindexset()     indexpath in visiblerows{         sections.addindex(indexpath.section)     }      //attempt 1 reload data     //self.tableview.reloaddata()     //attempt 2 reload sections     self.tableview.reloadsections(sections, withrowanimation: uitableviewrowanimation.none) }  func tableview(tableview: uitableview, viewforheaderinsection section: int) -> uiview? {     //show section header cell name of event creator     var cellidentifier = "sectionheadercell"     var headerview = tableview.dequeuereusablecellwithidentifier(cellidentifier) as! sectionheadercell      headerview.backgroundcolor = uicolor.whitecolor()     headerview.creator.text = self.events[section].eventcreator()      var fromdate = self.events[section].fromdate()! + " " + self.events[section].fromtime()!      var dateformatter = nsdateformatter()      dateformatter.dateformat = "mm/dd/yy hh:mm z"     var eventstartdate = dateformatter.datefromstring(fromdate)?.timeintervalsince1970      var timeuntilend = eventstartdate! - nsdate().timeintervalsince1970      //display time left     var seconds = timeuntilend % 60     var minutes = (timeuntilend / 60) % 60     var hours = timeuntilend / 3600     headerview.headertimeleft.text = nsstring(format: "%dh %dm %ds", int(hours), int(minutes), int(seconds)) string     return headerview }

you're trying update label correct? shouldn't need redraw entire header view. if change label text , possibly call setneedsdisplay on label should take care of itself.


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