Question

int variabla;

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {

return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {


if (variabla == 1)
    return list4.count;

else if(variabla == 2)
    return list3.count;

if (variabla == 3)
    return list1.count;

if (variabla == 4)
    return list2.count;

return YES;

[pickerView reloadAllComponents];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (variabla == 1) {
    subjectField.text = [list4 objectAtIndex:row];
}
else if  (variabla == 2) {
    gradeField.text = [list3 objectAtIndex:row];
}
else if (variabla == 3) {
    mathField.text = [list1 objectAtIndex:[pickerView selectedRowInComponent:0]];
    selectedRow = [pickerView selectedRowInComponent:0];
    coreTView.text = [mathMeaning objectAtIndex:selectedRow];
}
if (variabla == 4) {
    elaField.text = [list2 objectAtIndex:[pickerView selectedRowInComponent:0]];
    selectedRow = [pickerView selectedRowInComponent:0];
    coreTView.text = [elaMeaning objectAtIndex:selectedRow];
}


[pickerView reloadAllComponents];
NSLog(@"row selected is %d", selectedRow);

}

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

if (variabla == 1)
    return [list4 objectAtIndex:row];


if (variabla == 2)
    return [list3 objectAtIndex:row];

if (variabla == 3)
    return [list1 objectAtIndex:row];

if (variabla == 4)
    return [list2 objectAtIndex:row];

return NO;

[pickerView reloadAllComponents];
}

I would like to know or pointed in the right direction on how to load a UIPickerView based on the user input from a previous UITextField so if they type in the previous textfield apple, I would like red, green, blue to show in the UIPickerView or if they type orange, I would like to see orange, yellow.

Answer 1

Sounds like a good time to use a multidimensional array:

NSArray *titles = [[NSArray alloc] initWithObjects:
 [[NSArray alloc] initWithObjects:@"Red",@"Green",@"Blue",nil],
 [[NSArray alloc] initWithObjects:@"Orange",@"Yellow",@"Grape",nil],
 nil];

Now all you need is an int (looks like you’re using variabla) that represents the input- for example, if the user entered “Apple”, then you’d set variabla to 0; if they entered “Orange”, set variabla to 1; and so on.

Then, you could set up the relevant functions accordingly:

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return [[titles objectAtIndex:variabla] count];
}

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

You may add support for as many words as you want by simply adding another NSArray to titles.