-(NSInteger)numberOfComponentsInPickerView: (UIPickerView *)thePickerView
{ return 1; }

-(NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:                    (NSInteger)component
{return [list count]; }

-(NSString *)pickerView:(UIPickerView *)thePickerview titleForRow:(NSInteger)row  forComponent:(NSInteger)component
{return [list objectAtIndex:row]; }

-(void)pickerView:(UIPickerView *)thePickerview didSelectRow:(NSInteger)row inComponent:      (NSInteger)component
{
    uitextfield1.text = [list objectAtIndex:row];
    utitextfield2.text = [list objectAtIndex:row];
}



- (void)viewDidLoad {

[super viewDidLoad];

    uitextfield1.inputView = pickerView;
uitextfield2.inputView = pickerView;

list = [[NSMutableArray alloc] init];
[list addObject:@"a"];
[list addObject:@"b"];
    [list addObject:@"c"];
    [list addObject:@"d"];
}

-(void)pickerView:(UIPickerView *)thePickerview didSelectRow:(NSInteger)row inComponent:      (NSInteger)component
{
    // textFields is an NSArray holding each of the textfields that are using the picker as an input view
    for (UITextField textField in textFields)
    {
        if ([textField isFirstResponder])
        {
            textField.text = [list objectAtIndex:row];
            break;
        }
    }
}

#define kFirstTextField 101
#define kSecondTextField 102
#define kThirdTextField 103
//... etc

[myPickerView setHidden:NO];  // or however you show the picker
[myPickerView setTag:textField.tag];
[myPickerView reloadAllComponents];

-(NSString *)pickerView:(UIPickerView *)thePickerview
            titleForRow:(NSInteger)row
           forComponent:(NSInteger)component
{
    if (thePickerView.tag==kFirstTextField)
        { return [list1 count]; }
    if (thePickerView.tag==kSecondTextField)
        { return [anotherOrTheSameList count]; }
// of course, you can also use a switch statement
    return [defaultList count];
}

-(void)   pickerView:(UIPickerView *)thePickerview
        didSelectRow:(NSInteger)row
         inComponent:(NSInteger)component
{
    UITextField *field = (UITextField *) [thePickerview.superview viewWithTag:thePickerview.tag];
// this assumes the UIPickerView is the subview of the same view as the UITextFields
    if (thePickerview.tag==kFirstTextField)
        { field.text = [list1 objectAtIndex:row]; }
    if (thePickerview.tag==kSecondTextField)
        { field.text = [anotherOrTheSameList objectAtIndex:row]; }
    // etc.
    // alternatively:
    field.text = [self pickerView:thePickerview titleForRow:row forComponent:0];
}