collectionView页脚没有显示

Question

我已经检查了dataSource，如下面的屏幕截图所示。

我还实现了 override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView { if kind == UICollectionElementKindSectionHeader { var header = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "Header", forIndexPath: indexPath) as? DetailHeader if header == nil { header = DetailHeader() } return header! } else { println("footer") var footer = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "Footer", forIndexPath: indexPath) as! UICollectionReusableView return footer } } 方法：

println

我能够显示我的标题，但我的页脚从未显示过。 private final HibernateBundle<RestStubConfig> hibernate = new HibernateBundle<RestStubConfig>(Hotel.class) { public DataSourceFactory getDataSourceFactory(RestStubConfig configuration) { return configuration.getDataSourceFactory(); } }; public static void main(String[] args) throws Exception { new ServerStart().run(args); } @Override public void run(RestStubConfig restConf, Environment env) throws Exception { final HotelResource hotel = new HotelResource(); env.jersey().register(hotel); } @Override public void initialize(Bootstrap<RestStubConfig> bootstrap) { bootstrap.addBundle(hibernate); } 永远不会触发。

Answer 1

1. 故事板的屏幕截图：

2.我的代码：

import UIKit

class BaseCVC: UICollectionViewController, UICollectionViewDelegateFlowLayout {

    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cvcCell", forIndexPath: indexPath)

        return cell;
    }

    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return Int(2)
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {

        return CGSizeMake(self.view.frame.size.width, 20)
    }

    override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {

        if kind == UICollectionElementKindSectionHeader {
            let header = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "header", forIndexPath: indexPath)

            return header

        } else {
            print("footer")
            let footer = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "footer", forIndexPath: indexPath)
            return footer
        }
    }
}

1. 模拟器中的结果：



1. 重要提示：我使用过Xcode 7 beta 5（Swift 2.0）

Answer 2

选项1 ：将footerReferenceSize上的UICollectionViewDelegateFlowLayout设置为大于0

选项2 ：在您collectionView(_:layout:referenceSizeForFooterInSection:) 中实施UICollectionViewDelegateFlowLayout功能。