properties - property doesn't set after lazy initialization objective-c -


i have bool property , @ start property equals no. want set property yes start of program, opportunity toggle it. this, made getter:

-(bool)turn {     if(!_turn)         _turn = yes;     return _turn; }

this getter set turn property yes, makes "constant", yes. why?

i thought 

if(!_turn)

construction specially reason want set "not set yet" object value

can answer me why so? , how can set property value want. thanks.

look @ action table:

 turn:     false          true !turn   turn = yes      nothing

when _turn false, flip true. when _turn true, nothing (there's no else statement). return value of _turn. yea, returning true in cases.

to honest, design not good. if want set initial value of variable value, in init method. provide method toggles value:

-(bool) toggleturn {   _turn = !_turn;   return _turn; }

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