我是 RxSwift 的新手,我想知道如何能够“反应性”地将 UIRefreshControl 与 UITableView 一起使用,而不是创建目标并手动调用的正常方式beginRefreshing()
and endRefreshing()
.
例如,假设我正在从 API 加载一些字符串:
class TableViewController: UITableViewController {
var data : [String] = []
let db = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
refreshControl = UIRefreshControl()
//I don't want to use
//refreshControl?.addTarget(self, action: #selector(getData), forControlEvents: .ValueChanged)
//Do something to refreshControl.rx_refreshing?
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
let str = data[indexPath.row]
cell.textLabel?.text = str
return cell
}
//MARK: - Requests
private func getData() {
let myData = MyAPI.getData() //Returns Observable<[String]>
myData
.subscribe({ [weak self] (event) in
switch event {
case .Next(let strings):
self?.data = strings
self?.tableView.reloadData()
break
case .Error(let err):
print(err)
break
case .Completed:
break
}
// self?.refreshControl?.endRefreshing()
})
.addDisposableTo(db)
}
}
MyAPI
发送一些字符串值的请求,我如何绑定refreshControl
打电话getData()
并且在网络请求完成(或出错)时停止刷新?我需要绑定到刷新控制.rx_refreshing?
RxSwift 的示例应用程序提供了一个有趣的类来处理这种逻辑:ActivityIndicator.
一旦你有ActivityIndicator
in,绑定代码rx_refreshing
到请求变得非常容易。
let activityIndicator = ActivityIndicator()
override func viewDidLoad() {
super.viewDidLoad()
refreshControl = UIRefreshControl()
// When refresh control emits .ValueChanged, start fetching data
refreshControl.rx_controlEvent(.ValueChanged)
.flatMapLatest { [unowned self] _ in
return self.getData()
.trackActivity(activityIndicator)
}
.subscribeNext { [unowned self] strings in
self.data = strings
self.tableView.reloadData()
}
.addDisposableTo(db)
// Bind activity indicator true/false to rx_refreshing
activityIndicator.asObservable()
.bindTo(refreshControl.rx_refreshing)
.addDisposableTo(db)
}
// getData only needs to return an observable, subscription is handled in viewDidLoad
private func getData() -> Observable<[String]> {
return myData = MyAPI.getData() //Returns Observable<[String]>
}
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