Collection View, Scroll View, Table View在iOS 10都與生俱來支援下拉更新了 !

在iOS 10,Collection View, Scroll View, Table View都與生俱來支援UIRefreshControl物件,只要三個步驟即可實現下拉更新功能:

1. 生成UIRefreshControl物件。

2. 設定UIRefreshControl物件在下拉更新時觸發的function。

3. 將UIRefreshControl物件指定到Collection View, Scroll View或Table View的refreshControl屬性。

實例:

let refreshControl = UIRefreshControl()
refreshControl.addTarget(self, action:
#selector(ViewController.refreshData(refreshControl:)) ,
for: .valueChanged)
self.movieTableView.refreshControl = refreshControl
Image for post
Image for post

到底這refreshControl屬性是哪裡來的呢? 其實它來自protocol UIRefreshControlHosting。

public protocol UIRefreshControlHosting : NSObjectProtocol {

UIScrollView遵從protocol UIRefreshControlHosting,而UITableView和UICollectionView皆繼承UIScrollView,因此讓Collection View, Scroll View, Table View都獲得了refreshControl屬性。

彼得潘的iOS App程式設計入門,文組生的iOS App程式設計入門講師,彼得潘的 Swift 程式設計入門,App程式設計入門作者,http://apppeterpan.strikingly.com

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