objective c - I need these three stock options to be class level variables, so they are only declared and initialised once -

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i need 3 stock options below declared , initialised once. have got pseudo-code achieve i'm unsure on how make work.

this declared in .m file of ios app , nothing in .h file .

pseudo-code below:

// _msftstockprice _googstockprice _applstockprice need class level if(_msftstrockprice == nil) googstockprice = [[[cpdstockpricestore sharedinstance] monthlyprices:cpdtickersymbolmsft]  if(_applestrockprice == nil) _msftstockprice = [[[cpdstockpricestore sharedinstance] monthlyprices:cpdtickersymbolmsft]   if(_msftstrockprice == nil) msftstockprice = [[[cpdstockpricestore sharedinstance] monthlyprices:cpdtickersymbolmsft]  if ([plot.identifier isequal:cpdtickersymbolaapl] == yes) {    return [_applestockprice objectatindex:index]; } else if ([plot.identifier isequal:cpdtickersymbolgoog] == yes) {    return [[_googstockprice objectatindex:index]; } else if ([plot.identifier isequal:cpdtickersymbolmsft] == yes) {    return [_msftstockprice objectatindex:index]; }

don't declare variables properties or instance variables, rather static variables. either in top scope of .m file, or if methods above place variables accessed, right inside method. so:

static nsarray *anarray=nil;

static variables visible instances of class. depending on design (threads) need guard against problems caused concurrent access.


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