iphone - Set delay animation for UIPicker? -

if have code below tell uipicker if nothing selected set feet 1, how can delay action few seconds?

// if feet values zero. if (([feetpicker selectedrowincomponent:0] == 0 & [feetpicker selectedrowincomponent:1] == 0)){ // set 1 foot. [feetpicker selectrow:1           incomponent:1              animated:yes];   } 

[nstimer    scheduledtimerwithtimeinterval:2.0    target:self    selector:@selector(firemethod)    userinfo:nil repeats:no]; 

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the above code can placed whenever want start timer.

-(void)firemethod {     // if feet values zero. if (([feetpicker selectedrowincomponent:0] == 0 & [feetpicker selectedrowincomponent:1] == 0)){ // set 1 foot. [feetpicker selectrow:1           incomponent:1              animated:yes];       } }