How to add two Range<Index> together? - ios

Question

so I am filtering data (all strings), and want to show the following:
The search words where the first letters contain your search (example. when searching 'Br' I want to see all the words that begin with 'Br' like Break, Broke,...)
The search words where the string contains the word (example. When searching 'Br' is shows all words containing 'br' in the word like 'groundbreaker').
I've got both of them to work separately (see let found and let foundMore), but now I want to merge both of them (first showing the search words where the first letter contains your search, after the ones where the string contains the word). Tried using the addition sign, but it gives the following error
Binary operator '+' cannot be applied to two 'Range?' operands
extension SearchResultsController : UISearchResultsUpdating {
func updateSearchResultsForSearchController(searchController: UISearchController) {
self.tableView.reloadData()
let searchBar = searchController.searchBar
let target = searchBar.text!
self.filteredData = self.originalData.filter {
s in
let options = NSStringCompareOptions.AnchoredSearch
let found = s.rangeOfString(target, options: options)
let optionsMore = NSStringCompareOptions.CaseInsensitiveSearch
let foundMore = s.rangeOfString(target, options: optionsMore)
let allTogether = found + foundMore
return (allTogether != nil)
}
self.tableView.reloadData()
}
}

Answer 1

Ranges cannot be added together, because the result may not be a proper range when the two ranges do not intersect.
However, you do not need to add this, because in the end you compare the overall range to nil. This means that you can compare the two sides to nil individually:
return s.rangeOfString(target, options: NSStringCompareOptions.AnchoredSearch) != nil
|| s.rangeOfString(target, options: NSStringCompareOptions.CaseInsensitiveSearch) != nil
check 1. and 2., should be viewed like this, not a mix of both
Then you should filter twice, and append the second array to first one:
var filtered1 = self.originalData.filter { s in
return s.rangeOfString(target, options: NSStringCompareOptions.AnchoredSearch) != nil
}
let filtered2 = self.originalData.filter { s in
// Exclude results of the first search
return s.rangeOfString(target, options: NSStringCompareOptions.AnchoredSearch) == nil
&& s.rangeOfString(target, options: NSStringCompareOptions.CaseInsensitiveSearch) != nil
}
filtered1 += filtered2
self.filteredData = filtered1

Answer 2

For your case you can replace + with ?? so that if either range is non-nil it will be set as the value of allTogether. This is minimal code, but isn't necessarily the most obvious or easy to read. An explicit logical OR nil test is more obvious.

Answer 3

If possible, can you can try this:
let indexSet = NSMutableIndexSet()
indexSet.addIndexesInRange(NSMakeRange(0, 5))
indexSet.addIndexesInRange(NSMakeRange(10, 4))
indexSet.addIndex(5)
println(indexSet)
Then you can do your activity here:
indexSet.enumerateIndexesUsingBlock { (index, stop) -> Void in
println(index)
}