// 代理方式獲取結(jié)果
@objc public protocol ZZPhotoPickerControllerDelegate : NSObjectProtocol {
 @objc optional func photoPickerController(_ photoPickerController: ZZPhotoPickerController, didSelect assets: [Any])
}

photoPickerController.rx.assetsSelected.subscribe(onNext: { assets in
 // do something
}

collectionView.rx.itemSelected.subscribe(onNext: { indexPath in
 // do something
}

/// Reactive wrapper for `delegate` message `collectionView(_:didSelectItemAtIndexPath:)`.
 public var itemSelected: ControlEvent<IndexPath> {
  let source = delegate.methodInvoked(#selector(UICollectionViewDelegate.collectionView(_:didSelectItemAt:)))
   .map { a in
    return try castOrThrow(IndexPath.self, a[1])
   }
  
  return ControlEvent(events: source)
 }

extension Reactive where Base: UIScrollView {
   /// ...這部分代碼省略不用看

  /// Reactive wrapper for `delegate`.
  ///
  /// For more information take a look at `DelegateProxyType` protocol documentation.
  public var delegate: DelegateProxy<UIScrollView, UIScrollViewDelegate> {
   return RxScrollViewDelegateProxy.proxy(for: base)
  }
  
  /// ...后面的代碼暫時(shí)也不用看
}

open class RxScrollViewDelegateProxy
 : DelegateProxy<UIScrollView, UIScrollViewDelegate>
 , DelegateProxyType 
 , UIScrollViewDelegate {

 /// Typed parent object.
 public weak private(set) var scrollView: UIScrollView?

 /// - parameter scrollView: Parent object for delegate proxy.
 public init(scrollView: ParentObject) {
  self.scrollView = scrollView
  super.init(parentObject: scrollView, delegateProxy: RxScrollViewDelegateProxy.self)
 }

 // Register known implementations
 public static func registerKnownImplementations() {
  self.register { RxScrollViewDelegateProxy(scrollView: $0) }
  self.register { RxTableViewDelegateProxy(tableView: $0) }
  self.register { RxCollectionViewDelegateProxy(collectionView: $0) }
  self.register { RxTextViewDelegateProxy(textView: $0) }
 }

 /// ...后面的感覺(jué)沒(méi)什么關(guān)系，先不看
}

class RxPhotoPickerControllerDelegateProxy: DelegateProxy<ZZPhotoPickerController, ZZPhotoPickerControllerDelegate>, DelegateProxyType, ZZPhotoPickerControllerDelegate {
 
 /// Typed parent object.
 public weak private(set) var photoPickerController: ZZPhotoPickerController?
 
 /// - parameter scrollView: Parent object for delegate proxy.
 public init(photoPickerController: ParentObject) {
  self.photoPickerController = photoPickerController
  super.init(parentObject: photoPickerController, delegateProxy: RxPhotoPickerControllerDelegateProxy.self)
 }
 
 static func registerKnownImplementations() {
  self.register { RxPhotoPickerControllerDelegateProxy(photoPickerController: $0) }
 }
 
 // 把上面的寫好后，編輯器會(huì)提示你需要實(shí)現(xiàn)一下兩個(gè)方法，一個(gè)是獲取，一個(gè)是設(shè)置，所以很好理解該在方法里實(shí)現(xiàn)什么。
 static func currentDelegate(for object: ZZPhotoPickerController) -> ZZPhotoPickerControllerDelegate? {
  return object.zzDelegate
 }
 
 static func setCurrentDelegate(_ delegate: ZZPhotoPickerControllerDelegate?, to object: ZZPhotoPickerController) {
  object.zzDelegate = delegate
 }
 
}

extension Reactive where Base: ZZPhotoPickerController {
 
 public var zzDelegate: DelegateProxy<ZZPhotoPickerController, ZZPhotoPickerControllerDelegate> {
  return RxPhotoPickerControllerDelegateProxy.proxy(for: base)
 }
 
}

extension Reactive where Base: ZZPhotoPickerController {
 
 var assetsSelected: ControlEvent<[Any]> {
  let source: Observable<[Any]> = self.zzDelegate.methodInvoked(#selector(ZZPhotoPickerControllerDelegate.photoPickerController(_:didSelect:))).map { a in
   return a[1] as! [Any]
  }
  return ControlEvent.init(events: source)
 }
 
}

vc.rx.assetsSelected.subscribe(onNext: { (assets) in
    // do something
   }).disposed(by: self.disposeBag)