calling selectRow:inComponent:animated: method - ios5

Question

I have 2 UIpicker view in my app and I want the pickers to show the last chosen row after i saved my data. I am using this selectRow:inComponent:animated: method, but where do I exactly call this method?
in viewDidLoad:
if (self.pickerView == nil) {
self.pickerView = [[UIPickerView alloc] init];
self.pickerView.delegate = self;
self.pickerView.showsSelectionIndicator = YES;
in pickerView:viewForRow:forComponent:reusingView:
if (component == 0)
{
for (int j =20; j<=200; j++)
{
NSString* myString = [NSString stringWithFormat:#"%d",j];
[myArray addObject:myString];
}
UILabel *weightLabel0 = [[UILabel alloc] initWithFrame:CGRectMake(40, 0, 100, 32)];
Label0.text = [myArray objectAtIndex:row];
Label0.textAlignment = UITextAlignmentLeft;
Label0.backgroundColor = [UIColor clearColor];
[rowView insertSubview:weightLabel0 atIndex:1];
return rowView;
}
and i have a method here:
-(void) refreshPicker
{
NSArray* mArray = [self.myTextField.text componentsSeparatedByString:#"."];
NSNumber* str1 = [mArray objectAtIndex:0];
int selectRow1 = [str1 intValue]-20;
NSNumber* str2 = [mArray objectAtIndex:1];
int selectRow = [str2 intValue];
if (selectRow == 0) {
int selectRow2 = 0;
[self.pickerView selectRow:selectRow2 inComponent:1 animated:NO];
}
else if (selectRow == 5) {
int selectRow2 = 1;
[self.pickerView selectRow:selectRow2 inComponent:1 animated:NO];
}
[self.pickerView selectRow:selectRow1 inComponent:0 animated:NO];
[pickerView_ reloadAllComponents];
}
how should i put this together? if i call this method at, for instance, viewDidLoad, nothing happens. help please =)

Answer 1

I have came up with an idea. since my pickers only create the items when the textfield is being called, i.e. becomes first responder, hence, i call my refreshPicker method inside textFieldDidBeginEditing. and don't forget to set the textfield delegate to self. =) to those who encounters my problem, cheers.