Question

Given this dictionary:

"vals":[
{
"ID":"1",
"NAME":"Jack"
},
{
"ID":"2",
"NAME":"Jason"
},
{
"ID":"3",
"NAME":"Sheryl"
},
{
"ID":"4",
"NAME":"Clark"
},
{
"ID":"5",
"NAME":"Markus"
}]

I am using pickerView’s method:

NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

So, given the NSInteger row, how do I get the name of that ID?

Answer 1

very basic way:

for (NSDictionary *idDictionary in [root objectForKey:@"vals"])
{
    NSInteger idValue = [[idDictionary objectForKey:@"ID"] integerValue];
    if (idValue == row)
        return [idDictionary objectForKey:@"NAME"]
}

although you should probably remember that the pickerView rows begin at 0, so you need to account for this

edit: you should add a return nil or @”” after the loop to catch the case where the item is missing. But as xlc0212 pointed out above, a different data structure would work better. My suggestion would be to have a dictionary like:

NSDictionary *myDict = @{@"vals" : @[@"Jack", @"Jason", @"Sheryl", @"Clark", @"Markus"]};
NSString *value = [[myDict objectForKey:@"vals"] objectAtIndex:row];