How to search Multiple items or Search regardless of position UISearchBar - ios

Question

Ive been following this example https://www.raywenderlich.com/113772/uisearchcontroller-tutorial
Ive incorporated sqlite to fill the tableview, but currently the search is using substrings with .contains.
func filterContentForSearchText(searchText: String, scope: String = "All") {
filteredFood = food.filter { candy in
return candy.name.lowercaseString.containsString(searchText.lowercaseString)
}
tableView.reloadData()
}
Ive looked up a few different ways, NSPredicates and Regex, but Im not quite sure how to incorporate them correctly, or if thats what I even need to do.
Ex.Cell is "Stackoverflow is so amazing!"
If i search for Stackoverflow, the search is fine, but if I search "so is" I get no results.

Answer 1

You are looking for a more customized search method, which you would have to develop yourself.
For the example you provided, this code searches for each individual word to match:
let searchTerms = searchText.componentsSeparatedByString(" ").filter { $0 != "" }
filteredFood = food.filter { candy in
for term in searchTerms{
if !candy.name.lowercaseString.containsString(term.lowercaseString){
return false
}
}
return true
}

Answer 2

You can use regex for this using NSRegularExpression. For a regex to do a keyword search, I think the best way to do it is to do it in the following way: (str1|str2|str3).
So, in swift you can create replace the spaces with '|' and then use regular expressions:
let rtext = searchText.stringByReplacingOccurrencesOfString(" ", withString: "|");
let regex = NSRegularExpression(pattern: "(\(rtext))", .CaseInsensitive);
filteredFood = food.filter { candy in
return regex.numberOfMatchesInString(candy.name, options: 0, range: NSRange(0, candy.name.characters.count) > 0;
}
(Note haven't tested the code)

Answer 3

You can search in more than one label for example you have a class that contains state and city. So if the city does not exist it shows the rest of the cities in the state.
Here is what I am taking about:
// Set up the search text
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
// Create and divid the string into substring such as "You are" to "You" and "are"
let searchTerm = searchText.components(separatedBy: " ").filter{ $0 != "" }
// Whatever is being filtered is assigned to rilteredArrayPropertys
filteredArrayPropertys = arrayPropertys.filter({ (state) -> Bool in
// Search each term or substring
for term in searchTerm{
// Check which substring is equal state.propertyState, and if it statsifies it will return and assign to state.propertyState.
// .range(of: ): is what is being typed into search bar. state.propertyState is what has been setted.
if (state.propertyState.lowercased().range(of: term.lowercased()) != nil) || (state.propertyCity.lowercased().range(of: term.lowercased()) != nil) {
return true
}
}
return false
})
if searchText != "" {
shouldShowSearchResults = true
self.tableView.reloadData()
}
else {
shouldShowSearchResults = false
self.tableView.reloadData()
}
}