iOS7 中的 UIRefreshControl 与 UICollectionView

iOS7中的UIRefreshControl与UICollectionView的使用

swift
class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
    
    @IBOutlet weak var collectionView: UICollectionView!
    let refreshControl = UIRefreshControl()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView.delegate = self
        collectionView.dataSource = self
        
        refreshControl.addTarget(self, action: #selector(refreshData), for: .valueChanged)
        collectionView.addSubview(refreshControl)
    }
    
    @objc func refreshData() {
        // 模拟异步请求最新数据
        DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
            // 更新数据
            self.collectionView.reloadData()
            self.refreshControl.endRefreshing()
        }
    }
    
    // 实现UICollectionViewDelegate和UICollectionViewDataSource的相关方法
    // ...
}

swift
class CustomLayout: UICollectionViewFlowLayout {
    
    override func prepare() {
        super.prepare()
        
        // 设置每个item的大小
        itemSize = CGSize(width: 100, height: 100)
        
        // 设置每个item之间的间距
        minimumInteritemSpacing = 10
        minimumLineSpacing = 10
        
        // 设置滚动方向为垂直方向
        scrollDirection = .vertical
        
        // 设置section的边距
        sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
    }
}
class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
    
    @IBOutlet weak var collectionView: UICollectionView!
    let layout = CustomLayout()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView.delegate = self
        collectionView.dataSource = self
        
        collectionView.setCollectionViewLayout(layout, animated: true)
    }
    
    // 实现UICollectionViewDelegate和UICollectionViewDataSource的相关方法
    // ...
}