Question

Hello I have the following code:

if(_deviceSegmentCntrl.selectedSegmentIndex == 0)
{
    deviceOne = [[NSString alloc] initWithFormat:@"string01"];
}
if(_deviceSegmentCntrl.selectedSegmentIndex == 1)
{
    deviceOne = [[NSString alloc] initWithFormat:@"string02"];
}
if(_deviceSegmentCntrl.selectedSegmentIndex == 2)
{
    deviceOne = [[NSString alloc] initWithFormat:@"string03"];
}

NSString *deviceType = [[NSString alloc] initWithFormat:_deviceSegmentCntrl];

I am wanting to have the NSString output the string the user selects in the segmented control.

How do I append the initWithFormat: so that it reflects the chosen index?

Cheers

Answer 1

Firstly, NSString’s are so common that there is a shorthand to greatly simplify your instantiations:

deviceOne = @"string01";

is has an identical result to

deviceOne = [[NSString alloc] initWithFormat:@"string01"];

Now, I’m not sure exactly what you are wanting to achieve, so I’ll mention a few things that I think are in the ballpark.

If you just want a string that is exactly what is displayed on the control, use

NSString deviceType = [_deviceSegmentCntrl titleForSegmentAtIndex:_deviceSegmentCn.selectedSegmentIndex];

When you want a more complex string, you can use the class method stringWithFormat, perhaps like this:

NSString *deviceType = [NSString stringWithFormat:@"%@ - %@", deviceOne, [_deviceSegmentCntrl titleForSegmentAtIndex:_deviceSegmentCn.selectedSegmentIndex]];

Where deviceOne is from your posted code.