UIScrollViewDelegate Not Being Called in Custom Class - ios

Question

When I instantiate and add a scroll view to my self.view in my ViewController class and set the scroll view's delegate to self, the delegate functions get called. As written below:
class ViewController: UIViewController, UIScrollViewDelegate {
#IBOutlet weak var smallView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
let width = Double(view.frame.width)
let height = Double(view.frame.height)
let frame = CGRect(x: 0.0, y: 0.0, width: width, height: height)
let scrollView = UIScrollView(frame: frame)
//scrollView.backgroundColor = UIColor.blue
let size = CGSize(width: width + 300, height:1000)
scrollView.contentSize = size
smallView.addSubview(scrollView)
scrollView.delegate = self
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
print("Gets called.")
}
}
However, when I create a custom class, in this case called, PhotoBooth, and call try to call the delegate function in this custom class, the functions do not get called. Here is my custom class:
import Foundation
import UIKit
class PhotoBooth: NSObject, UIScrollViewDelegate {
private var boothView: UIView
//private var scrollView: UIScrollView
init(view: UIView) {
boothView = view
}
func startSession() {
let width = Double(boothView.frame.width)
let height = Double(boothView.frame.height)
let frame = CGRect(x: 0.0, y: 0.0, width: width, height: height)
let scrollView = UIScrollView(frame: frame)
//scrollView.backgroundColor = UIColor.blue
let size = CGSize(width: width + 300, height:1000)
scrollView.contentSize = size
boothView.addSubview(scrollView)
scrollView.delegate = self
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
print("paisdjfij")
}
}
And I instantiate the class in my ViewController like so:
import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
#IBOutlet weak var smallView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
let photoBooth = PhotoBooth(view: self.view)
photoBooth.startSession()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Any solutions to the problem? Please let me know and thank you so much for your help in advance.

Answer 1

Instead of trying this You should use protocols to call scroll view in custom class.It will look somewhat like this.
CustomClass.h
#protocol CustomDelegate <NSObject>
-(void)customDelegateMethod;
#end
#interface CustomClass : UIScrollView <UIScrollViewDelegate>
{
id<CustomDelegate> delegate
}
CustomClass.m
-(void) methodScrollView
{
[self.delegate customDelegateMethod];
}
ViewController.h
#interface ViewController: UIViewController <CustomDelegate>
{
}
ViewController.m
-(void)makeCustomScrollView
{
CustomClass *objCustom = [[CustomClass alloc] init];
objCustom.delegate = self;
//other stuff
}
-(void)customDelegateMethod
{
}