I'm new to Swift and am coming from from AppleScript Obj-C. I've read through a few books and am getting comfortable with the syntax, but I still feel pretty lost.
I'm trying to create a simple Token Field that suggests autocomplete tokens like Apple Mail does when it recognizes an email in your contacts. My inspiration comes from this ASOC script (post #6). I tried to duplicate it in swift as best I could (without the action menu on tokens):
import Cocoa
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
@IBOutlet weak var window: NSWindow!
@IBOutlet weak var tokenField: NSTokenField!
var theNames = [String]()
func applicationDidFinishLaunching(aNotification: NSNotification) {
tokenField.setDelegate(tokenField.delegate())
theNames = ["Pomona", "Potomac", "Potable", "Process", "Plow"]
}
func tokenField(tokenField : NSTokenField, completionsForSubstring substring : String, indexOfSelectedItem selectedIndex : UnsafeMutablePointer<Int>) -> [AnyObject]? {
var thePredicate = NSPredicate(format: "SELF beginswith[cd] %@", substring)
var matchingNames = (theNames as NSArray).filteredArrayUsingPredicate(thePredicate)
return matchingNames as Array
}
func tokenField(tokenField : NSTokenField, hasMenuForRepresentedObject representedObject : AnyObject) -> Bool {
return true
}
func applicationWillTerminate(aNotification: NSNotification) {
// Insert code here to tear down your application
}
}
So to sum up. As the user types, if the first letter is "p", a menu with "Pomona", "Potomac", "Potable", "Process", "Plow" should pop up below the word. I'm not sure why nothing is popping up.
Any ideas?
EDIT:
Feb 13 2016
Below ioquatix provided the answer to my question but it is beyond my current knowledge level. He did point out a key flaw in my original code is the lack of NSTokenFieldCellDelegate
and NSTokenFieldDelegate
. Thanks to his help my (simple but limited) solution is:
import Cocoa
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, NSTokenFieldCellDelegate, NSTokenFieldDelegate {
var names = ["Pat", "Pot"]
@IBOutlet weak var tokenField: NSTokenField!
func tokenField(tokenField: NSTokenField, completionsForSubstring substring: String, indexOfToken tokenIndex: Int, indexOfSelectedItem selectedIndex: UnsafeMutablePointer<Int>) -> [AnyObject]? {
return (names as NSArray).filteredArrayUsingPredicate(NSPredicate(format: "SELF beginswith[cd] %@", substring))
}
}
I have implemented the auto-completion using the NSTokenFieldDelegate methods:
import Cocoa
import CoreData
class PMTagCompletionController : NSObject, NSTokenFieldDelegate, NSTokenFieldCellDelegate {
var managedObjectContext : NSManagedObjectContext?
var tagEntityName = "Tag"
func completionsForSubstring(substring : String) -> [String] {
if let managedObjectContext = self.managedObjectContext {
let tagEntity: NSEntityDescription? = NSEntityDescription.entityForName(self.tagEntityName, inManagedObjectContext: managedObjectContext)
let request: NSFetchRequest = NSFetchRequest.init()
request.entity = tagEntity;
if let allTags = try! managedObjectContext.executeFetchRequest(request) as? [PMTag] {
var tagNames : [String] = []
let lowercaseSubstring: String = substring.lowercaseString
for tag: PMTag in allTags {
if tag.name.lowercaseString.hasPrefix(lowercaseSubstring) {
tagNames.append(tag.name)
}
}
return tagNames
}
}
return []
}
func tokenFieldCell(tokenFieldCell: NSTokenFieldCell, completionsForSubstring substring: String, indexOfToken tokenIndex: Int, indexOfSelectedItem selectedIndex: UnsafeMutablePointer<Int>) -> [AnyObject] {
return self.completionsForSubstring(substring)
}
func tokenField(tokenField: NSTokenField, completionsForSubstring substring: String, indexOfToken tokenIndex: Int, indexOfSelectedItem selectedIndex: UnsafeMutablePointer<Int>) -> [AnyObject]? {
return self.completionsForSubstring(substring)
}
}
It uses PMTag instances from CoreData which represent individual tags and are thus used for auto-completion in the tag field. This should be close enough to what you want to get something working.