iOS将scrollView和collectionView委托分开为单个文件

你不能有单独的代表. UICollectionView是UIScrollView的子类,并覆盖其delegate属性以将其类型更改为UICollectionViewDelegate(这是UIScrollViewDelegate的子类型).因此,您只能将一个委托分配给集合视图,并且它可以实现UICollectionViewDelegate方法和UIScrollViewDelegate方法的任意组合.

但是,您可以毫不费力地将uIScrollViewDelegate方法转发到另一个对象.以下是你在Swift中的表现;它在Objective-C中非常相似(因为这都是使用Objective-C运行时完成的)：

import UIKit
import ObjectiveC

class ViewController: UICollectionViewController {

    let scrollViewDelegate = MyScrollViewDelegate()

    override func respondsToSELEctor(aSELEctor: SELEctor) -> Bool {
        if protocol_getmethodDescription(UIScrollViewDelegate.self,aSELEctor,false,truE).types != nil || protocol_getmethodDescription(UIScrollViewDelegate.self,true,truE).types != nil {
            return scrollViewDelegate.respondsToSELEctor(aSELEctor)
        } else {
            return super.respondsToSELEctor(aSELEctor)
        }
    }

    override func forWARDingTargetForSELEctor(aSELEctor: SELEctor) -> AnyObject? {
        if protocol_getmethodDescription(UIScrollViewDelegate.self,truE).types != nil {
            return scrollViewDelegate
        } else {
            return nil
        }
    }

请注意,MyScrollViewDelegate可能必须是NSObject的子类才能使其正常工作.