如何在选择器视图中每次选择/设置选定行作为默认选定行

Question

I have a picker view

[picker selectRow:3 inComponent:0 animated:YES];

when i wrote this code in view did load,

This method is used to set the row 3 as default row in picker.

But i want that the row i have selected is set to be as default for the next time.

what to do? thanks in advance...

Answer 1

Why dont you save the last pressed row in a variable and you load it next time?

Something like:

    int myLastPressed;

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

        myLastPressed = row;

    }

You can use a variable in your code, or a global one in NSUSerDefaults

And then next time:

[picker selectRow:myLastPressed inComponent:0 animated:YES];

Answer 2

Try like this

NSUserDefaults *usrDefaults = [NSUserDefaults standardUserDefaults]; 

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

    [usrDefaults setInteger:row forKey:@"Index"];
}

[pickerView selectRow:[[NSUserDefaults standardUserDefaults]integerForKey:@"Index"] inComponent:0 animated:NO];

Answer 3

This question is very unprecise. What do you want to do?

selectRow:inComponent: is exactly what you have to call, if you want a specific row selected. If you want to save the selected state for the next appstart, you could save the current selected row (read with selectedRowInComponent ) in the UserDefaults: [[NSUserdefault standardUserDefaults] saveInteger: selectedRow forKey @"savedSelectedPickerRowComponent1"]