iphone - how can I put particular action as I select any row of UIPickerView? -

i writing code

- (nsstring *)pickerview:(uipickerview *)pickerview titleforrow:(nsinteger)row forcomponent:(nsinteger)component {      int n=row+1;     if(row == 0)         return [nsstring stringwithformat:@"%d minute", n];     return [nsstring stringwithformat:@"%d minutes", n]; } 

now want start timer choose row, row 5 has 5 mints, want start timer 5 mints, should do, how can choose particular row , press button , timer starts event?

for future if go onto google , type in name of class , "class reference" can find information need on apple website.

for instance, went onto google , typed "uipickerview class reference" , got here: http://developer.apple.com/library/ios/#documentation/uikit/reference/uipickerview_class/reference/uipickerview.html.

on website if read description says "the delegate must adopt uipickerviewdelegate protocol" , if click there says, under tasks:

responding row selection –

pickerview:didselectrow:incomponent: 

this delegate method need implement called when user selects row. if click on it gives little description , such.

if go description full method is:

- (void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component 

so when user selects row method called , pickerview passed method automatically.

you can row user chose. if go page uipickerview class reference see this:

selecting rows in view picker

– selectrow:incomponent:animated: – selectedrowincomponent: 

the method selectedrowincomponent: 1 want. in delegate method can this:

int selectedrow = (int)[pickerview selectedrowincomponent:0]; 

:) thats when want find answers questions this. :)

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edit:

- (void)pickerview:(uipickerview *)pickerview didselectrow:(nsinteger)row incomponent:(nsinteger)component {     int selectedrow = (int)[pickerview selectedrowincomponent:0];     nslog(@"%i",selectedrow); }