UILabel display regular updates whilst loop is being executed -

i have long loop calculation. in order give user idea of progress prefer update of output data displayed in uilabels user can view interim output.

// run activity year     (int day = 1; day < 366; day++) {         (int hour = 1; hour < 25; hour++) {             (int minute = 1; minute < 61; minute++) {                 display = (day*10000)+(hour*100)+minute;                 self.displaytest.text = [[nsstring alloc] initwithformat: @"%d", display];             }         }     } 

obviously self.display.text won't updated until -(void) viewdidappear:(bool)animated has completed.

how refresh data, whenever hour loop completed? put in phantom button , refresh it. strikes me little crude. don't want have resort using activity indicator or progress view. thanks.

why not perform logic on separate nsthread , run ui updates on main thread occasionally? example, each time "hour" iterations finished (reached 24, after each "day"), perform ui logic on main thread.

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example:

- (void)updateui:(nsnumber*)display {     self.displaytest.text = [[nsstring alloc] initwithformat: @"%@", display]; }  - (void)yearstuff {     (int day = 1; day < 366; day++) {         int display;         (int hour = 1; hour < 25; hour++) {             (int minute = 1; minute < 61; minute++) {                 display = (day*10000)+(hour*100)+minute;             }         }         [self performselectoronmainthread:@selector(updateui:) withobject:[nsnumber numberwithinteger:display] waituntildone:yes];     } }  - (void)viewdidappear:(bool)animated {     [self performselectorinbackground:@selector(yearstuff) withobject:nil]; }