NSSearchField delegate in Yosemite - swift3

Question

I'm making a new Swift (3.0) framenwork which involves the use of a NSSearchField programmatically created, like the rest of the views.
This framenwork has the deployment target set to 10.10 and I found strange being not able to set the delegate metods for it. In fact NSSearchFieldDelegate only appear availabe in 10.11 on.
class PlistEditor: NSObject, NSOutlineViewDelegate, NSOutlineViewDataSource, NSTextFieldDelegate, NSSearchFieldDelegate {
var searchField : NSSearchField?
// more code..
init(tabItem: NSTabViewItem,
plistPath: String?) {
// more code..
let sf = NSSearchField(frame: NSMakeRect(80, 0, 80, 22))
self.searchField? = sf
// more code..
super.init()
// more code..
if #available(OSX 10.11, *) {
self.searchField?.delegate = self
} else {
// Fallback on earlier versions
}
// more code
}
}
Ok, I thought it was inherent from NStextField, and maybe I can access the cell and set up using the superclass delegate, but unfurtunately I cannot found a way to do that.
What I need is to be able to receive NSText/NSTextField notification in 10.10. How can I do this?
EDITED:
added more info on how is made plus some picts

Answer 1

Without providing more info, i am guessing you forgot to declare that your class is conforming to the NSSearchFieldDelegate.
See the example below, how to set it up for example a viewController. You just create an extension for your vc, and declare it to conform to the delegate.
class SearchViewController: NSViewController {
let searchField: NSSearchField? = NSSearchField(frame: .zero)
override func viewWillAppear() {
super.viewWillAppear()
if #available(OSX 10.11, *) {
self.searchField?.delegate = self
} else {
// Fallback on earlier versions
}
}
}
extension SearchViewController: NSSearchFieldDelegate {
func searchFieldDidStartSearching(_ sender: NSSearchField) {
print("didStart")
}
func searchFieldDidEndSearching(_ sender: NSSearchField) {
print("didEnd")
}
}
EDIT:
To capture the textDidChange event in earlier versions of Mac OS, you need to subclass NSSearchField and override textDidChange function. Every time a change happens in the searchField, it will call the function for you.
class DLSearchField: NSSearchField {
override func textDidChange(_ notification: Notification) {
Swift.print("textDidChange")
}
}