Cant get values by choosing specific row in UIPickerView - iphone

Question

i have a picker view with array of countries, and my point is, when user tap a specific row i will write some code depends of elements user choose, but, somehow its not working, please look at this:
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
if ([countries objectAtIndex:0]){
NSLog(#"You selected USA");
}
}
But problem is, in NSLog is always "You selected USA", regardless of which row i have pick. But, when i put that line of code here:
NSLog(#"You selected this: %#", [countries objectAtIndex:row]);
It show me in console which of country i have choose. But i need to do a things when user tap specific row, and i cant understand how to do this, please help me.

Answer 1

Quick answer: you should use
if ([[countries objectAtIndex:row] isEqualToString:#"USA"]) ...
Nice answer:
Define an enum and use switch-case structure:
// put this in the header before #interface - #end block
enum {
kCountryUSA = 0, // pay attention to use the same
kCountryCanada = 1, // order as in countries array
kCountryFrance = 2,
// ...
};
// in the #implementation:
-(void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
{
switch (row) {
case kCountryUSA:
NSLog(#"You selected USA");
break;
case kCountryCanada:
NSLog(#"You selected Canada");
break;
case kCountryFrance:
NSLog(#"You selected France");
break;
//...
default:
NSLog(#"Unknown selection");
break;
}
}