Motivation

By default the Scandit Barcode Scanner scans barcodes with a fixed symbol count range. Under certain conditions it is helpful to modify the length of the barcode to be decoded, for example if

you want to scan longer codes which cannot be decoded with the default settings.
to optimize decoder performance for codes of certain lengths when the application only requires scanning particular barcode lengths.

The active symbol count setting is ignored for fixed-size barcodes (EAN and UPC barcodes) as well as 2d codes.

Change the barcode length

To know the symbol count of a barcode, you can either:

scan it with the "Any Code" mode of the Scandit demo app, available on the Apple Store and Google Play Store.
have a look at Calculating symbol counts for variable-length symbologies.

Changing the length of the barcodes is done through the property SymbologySettings.ActiveSymbolCounts. Following an example of changing for Code 128 barcodes the symbol count range (7-20).

ScanSettings settings = ScanSettings.DefaultSettings ();
NSMutableSet codeLengths = new NSMutableSet();
int i = 7;
for (i= 7; i <= 20; i++) {
    codeLengths.Add (new NSNumber (i));
}
settings.SettingsForSymbology (Symbology.Code128).ActiveSymbolCounts = codeLengths;

Available since SDK version 4.12.0.