data not being inputted properly using cellForRowAtIndexPath

Question

After completing the tableView section of the Swift course, I took it upon myself to expand my knowledge of how tables work in general. I've run into a slight problem which I'm hoping to get help with ...

I have two data structures (both with a Category item). I'm using numberOfRowsInSection to determine the number of rows with a specific category (based on an index passed using prepareForSegue from the previous screen). The numberOfRowsInSection function is working (i.e. the screen shows the correct number of rows). Now I'd like to actually display the correct content on each row. My logic in cellForRowAtIndexPath doesn't seem to be correct because in some cases cell.vendorName.text displays the correct data, and in other cases it displays "No Value". How would I tweak the following code in order to ONLY display data related to a particular category type which was selected on the previous screen.

var index: Int?
let categoryData = Data().headerData
let vendorData = Data().vendorData

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows

    let categoryData = Data().headerData
    let vendorData = Data().vendorData

    let category = categoryData[index!]
    let categoryType = category.category

    var count: Int = 0

    for (var i=0; i < vendorData.count; i++) {

        if vendorData[i].category == categoryType {

            count = count + 1
        }
    }

    return count
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("vendorCell", forIndexPath: indexPath) as! VendorSelectionTableViewCell

    let category = categoryData[index!]
    let categoryType = category.category

    let vendorEntry = vendorData[indexPath.row]
    print(vendorEntry.category)

    if vendorEntry.category == categoryType {

        cell.vendorName.text = vendorData[indexPath.row].name

    } else {
         cell.vendorName.text = "No Value"

    }

    return cell
}

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data not being inputted properly using cellForRowAtIndexPath