Search for two elements simultaneous in Swift? - swift

Question

I have a struct like this:
struct StructName {
var name: String?
var contents: [Content]?
}
Content looks like this:
struct Content {
var contentName: String?
}
Right now I am just searching by the names inside my array of StructName
var array = [StructName]()
func searchBar(_ searchBar: UISearchBar, textDidChange searchText:String) {
var filteredArray = array.filter { $0.name?.range(of: searchText, options: [.caseInsensitive]) != nil}
}
How would I approach this if I want to search inside the elements in contents simultaneous with name in StructName?
If I structured it like this:
let contentA = [Content(contentName: "Content_1"), Content(contentName: "Content_2")]
let contentB = [Content(contentName: "Content_1"), Content(contentName: "Content_2")]
array[0] = (StructName(name: "Name_1", contents: contentA))
array[1] = (StructName(name: "Name_2", contents: contentB))
And I wrote "NC" in my searchText, it should return everything, since there is an "N" in "Name_1" and "Name_2" and there is a "C" in "Content_1" and "Content_2".
Example of filteredArray:
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
filteredArray = array.filter{ elements in
var result = false
elements.contents.forEach{ content in
if (content.contentName.lowercased().contains(searchText.lowercased()) ) {
result = true
}
}
if (content.name?.lowercased().contains(searchText.lowercased()))!{
result = true
}
return result
}
}
Note that this does not search simultaneously as I have described.

Answer 1

If you want to filter and find StructNames where Content array items compares with searchBar text, when look at this code
struct Content {
var contentValue: String
}
struct StructName{
var name: String?
var contents: [Content]?
}
var array = [ StructName(name: "test1", contents: [ Content(contentValue: "contentValue1"), Content(contentValue: "contentValue2"), Content(contentValue: "searchedText") ]) ]
let searchedText = "searchedText"
let filteredArray = array.filter{ structName in
var result = false
structName.contents?.forEach{ content in
if (content.contentValue.lowercased().contains(searchedText.lowercased()) ) {
result = true
}
}
return result
}

Answer 2

Your usage of the word simultaneous is not clear enough to describe what sort of search result you expect.
I assume,
if (and only if) name matches searchText or any contentName in contents matches searchText, the StructName instance appears in the filteredArray.
(matches is defined similar as your name in your post.)
Then you can write something like this:
var filteredArray = array.filter {
$0.name?.range(of: searchText, options: .caseInsensitive) != nil
|| $0.contents?.contains {content in content.contentName?.range(of: searchText, options: .caseInsensitive) != nil} == true
}
If this is not what you want, you may need to specify your search condition more precisely.
(By the way, name or contents needs to be Optional?)
(For your updated example)
Seems you want character based searching with every character needs to hit.
Using a little bit modified example:
var array = [StructName]()
let contentA = [Content(contentName: "Content_1"), Content(contentName: "Content_2")]
let contentB = [Content(contentName: "Content_3"), Content(contentName: "Content_4")]
array.append(StructName(name: "Name_1", contents: contentA))
array.append(StructName(name: "Name_2", contents: contentB))
with some debugging help:
extension StructName: CustomStringConvertible {
var description: String {
return "\(name ?? ""):\(contents?.map{$0.contentName ?? ""}.joined(separator: ";") ?? "")"
}
}
print(array) //->[Name_1:Content_1;Content_2, Name_2:Content_3;Content_4]
You can write something like this:
func searchBar(_ searchBar: UISearchBar, textDidChange searchText:String) {
let filteredArray = array.filter {element in
!searchText.lowercased().contains {searchChar in
!(element.name ?? "").lowercased().contains(searchChar)
&& !(element.contents ?? []).contains {content in (content.contentName ?? "").lowercased().contains(searchChar)}
}
}
print(filteredArray)
}
Output example:
searchBar(UISearchBar(), textDidChange: "NC") //->[Name_1:Content_1;Content_2, Name_2:Content_3;Content_4]
searchBar(UISearchBar(), textDidChange: "1") //->[Name_1:Content_1;Content_2]
searchBar(UISearchBar(), textDidChange: "2") //->[Name_1:Content_1;Content_2, Name_2:Content_3;Content_4]
searchBar(UISearchBar(), textDidChange: "12") //->[Name_1:Content_1;Content_2]
Though, I'm not sure if this is what you expect, as your description is not clear enough yet.