Search array of array of strings with NSPredicate

Question

I have a NSSearchController that searches an array of arrays. An example of this master array is

[["key1',"value1"],["key2","value2"]]

My search function is as follows:

func updateSearchResultsForSearchController(searchController: UISearchController) {
    for (key, val) in zip(self.keys, self.values) {
        pairs.append([key,val])
    }

    filteredKeys.removeAll(keepCapacity: false)
    filteredValues.removeAll(keepCapacity: false)

    let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text)
    let searcher = (self.pairs as NSArray).filteredArrayUsingPredicate(searchPredicate)
    println(searcher)

    for matched in searcher {
        var appendedKey = matched[0] as! String
        var appendedValue = matched[1] as! String
        filteredKeys.append(appendedKey)
        filteredValues.append(appendedValue)
    }

    pairs.removeAll(keepCapacity: false)

    self.tableView.reloadData()
}

The problem is with my NSPredicate string, as I am searching an array of arrays, the SELF CONTAINS requires an exact string match to be in the array instead of it just containing it. I really want the subarrays of the master array to contain the string being searched.

I tried "name CONTAINS[c] %@" and "SELF BEGINSWITH[c] %@" Both fail. Does anyone know what predicate string to use to search an array of arrays?

hennes · Accepted Answer · 2015-08-20 17:56:51Z

3

You need to use ANY SELF.

let pairs = [["key1","value1"],["key2","value2"]]
let searchPredicate = NSPredicate(format: "ANY SELF CONTAINS[c] %@", "lue2")
let searcher = (pairs as NSArray).filteredArrayUsingPredicate(searchPredicate)
println(searcher) // Prints the second element

From the official documentation for ANY:

Specifies any of the elements in the following expression.

edited Aug 20, 2015 at 17:56

answered Aug 20, 2015 at 17:55

hennes

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