core data nstableview searchbar - macos

Question

i have a nstableview which i fill with data of core data.
NSManagedObject
import Foundation
import CoreData
#objc(Person)
public class Person: NSManagedObject {
#NSManaged public var firstName: String
#NSManaged public var secondName: String
}
RequestData
func requestData() {
let appdelegate = NSApplication.shared().delegate as! AppDelegate
let context = appdelegate.persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Person")
do {
person = try context.fetch(request) as! [Person]
tableViewn.reloadData()
} catch { }
}
i also have a custom cell view for my tableView.
I fill the data like this:
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
let view = tableView.make(withIdentifier: "Cell", owner: self) as? CustomCell
view?.txtfirstName.stringValue = person.firstName
view?.txtsecondName.stringValue = person.secondName
return view
}
Now i would like to realize a searchbar (which i have already in my view controller) for searching with first or second name.
but i have no idea how i can realize this.

Answer 1

Set the delegate of the NSSearchField to the target class
implement controlTextDidChange
override func controlTextDidChange(_ notification: Notification) {
if let field = notification.object as? NSSearchField {
let query = field.stringValue
let predicate : NSPredicate?
if query.isEmpty {
predicate = nil
} else {
predicate = NSPredicate(format: "firstName contains[cd] %# OR lastName contains[cd] %#", query, query)
}
requestData(with: predicate)
} else {
super.controlTextDidChange(notification)
}
}
Change requestData to
func requestData(with predicate : NSPredicate? = nil) {
let appdelegate = NSApplication.shared().delegate as! AppDelegate
let context = appdelegate.persistentContainer.viewContext
let request = NSFetchRequest<Person>(entityName: "Person")
request.predicate = predicate
do {
person = try context.fetch(request)
tableViewn.reloadData()
} catch { }
}
Side note:
If you are using NSManagedObject subclasses create the fetch request more specific NSFetchRequest<Person>(entityName... rather than NSFetchRequest<NSFetchRequestResult>(entityName..., that avoids the type cast in the fetch line.