Question

I have an UIPickerView with 2 components.
I would like to save the user’s selection and to apply it next time the pickerView is shown again.

Here’s my code:

    - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

    NSUserDefaults *pickerViewSelectionDefaults = [NSUserDefaults standardUserDefaults];
    [pickerViewSelectionDefaults setInteger:row forKey:@"pickerViewSelectionKey"];
    [pickerViewSelectionDefaults synchronize];

}

}

And…

- (void)viewWillAppear:(BOOL)animated { 

    NSUserDefaults *pickerViewSelectionDefaults = [NSUserDefaults standardUserDefaults];
    [pickerView selectRow:[pickerViewSelectionDefaults integerForKey:@"pickerViewSelectionKey"] inComponent:0 animated:YES];

}

Thanks!

Answer 1

I fail to understand what your real issue is. Your code should work given that you only spin component 0 and not 1. There’s an issue with storing the row for two components into one setting. If you spin component 1 to row 20 and then load the view it will most likely crash unless component 0 also has 20 rows.

Please provide an error message or something that indicate what is wrong. Also make sure that your viewWillAppear method is actually called.