Question

My numberOfComponentsInPickerView :

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}

My numberOfRowsInComponent :

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if (component == 0)
        return 100;
    if (component == 1)
        return 100;
    if (component == 2)
        return 100;

    return 0;
}

My titleForRow like this:

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{    
    if (component == 0)
        return [NSString stringWithFormat:@"%d", row];
    if (component == 1)
        return [NSString stringWithFormat:@"%d", row];
    if (component == 2)
        return [NSString stringWithFormat:@"%d", row];

    return 0;
}

my didSelectRow like this
after edited like Paras Joshi’s said :

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    int year = [picker selectedRowInComponent:0];
    int month = [picker selectedRowInComponent:1];
    int day = [picker selectedRowInComponent:2];
    if(viewPicker.tag == 1)
        labelDate1.text = [year stringByAppendingFormat:@" : %d : %d", month, day];
    else
        labelDate2.text = [year stringByAppendingFormat:@" : %d : %d", month, day];
}

it still gives me error ” bad receiver type ‘int’ ” and i still don’t get it how to fix it. how my label get data from titleForRow?

both input for year month and day all are number only (from 0 to 99) so that i wrote -> return [NSString stringWithFormat:@”%d”, row];

i dont put data for my pickerview at – (void)viewDidLoad because i want my labelDate1 or labelDate2 got data from pickerview. is there any possible my label get data from pickerview like i wrote above? or must i write my data at – (void)viewDidLoad ?

for any help, thank you for watching my question.

Answer 1

In your program you are appending string to an integer that is the issue.
This code makes the issue. Because year is an integer.

labelDate1.text = [year stringByAppendingFormat:@" : %d : %d", month, day];

Please check with this code.

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    int year = [picker selectedRowInComponent:0];
    int month = [picker selectedRowInComponent:1];
    int day = [picker selectedRowInComponent:2];
    NSString *date = @"";
    if(viewPicker.tag == 1)
        labelDate1.text = [date stringByAppendingFormat:@" %d : %d : %d",year, month, day];
    else
        labelDate2.text = [date stringByAppendingFormat:@"%d : %d : %d", year, month, day];
}