Use git tag as build (#) in iOS app

UsageExample.m

  NSDictionary *appInfo = [[NSBundle mainBundle] infoDictionary];
        NSString *versionStr = [NSString stringWithFormat:@"build (%@)",
                                [appInfo objectForKey:@"GitTag"]];
        

        self.detailDescriptionLabel.text = versionStr;

WriteGitTag.txt

***In your build phase

infoplist="$BUILT_PRODUCTS_DIR/$INFOPLIST_PATH"
gittag="$(cd "$SRCROOT" && git describe --always --abbrev=0)"
if [[ -n "$gittag" ]]; then
defaults write "${infoplist%.plist}" GitTag "$gittag"
fi

Uses the last tag as a build value