UIRefreshControl？没有名为“endRefreshing”的成员

Posted 2023-02-27

【中文标题】UIRefreshControl？没有名为“endRefreshing”的成员

【英文标题】：UIRefreshControl? does not have a member named 'endRefreshing'

【发布时间】：2015-02-14 23:33:35

【问题描述】：

我正在尝试使用我的 UITableView 进行简单的拉动刷新，但出现错误： 我的 onRefresh 方法中的 self.refreshControl.endRefreshing() 出现编译时错误 这是 viewController 的代码：

//
//  ViewController.swift
//  Rotten Tomatoes
//
//  Created by Dhruv Mangtani on 2/7/15.
//  Copyright (c) 2015 dhruv.mangtani. All rights reserved.

import UIKit
import SystemConfiguration
class ViewController: UITableViewController 

var moviesArray: NSArray?
var ratingsArray: NSArray?
override func viewDidLoad() 
    super.viewDidLoad()
    var refreshControl = UIRefreshControl()
    refreshControl = UIRefreshControl()
    refreshControl.addTarget(self, action: "onRefresh", forControlEvents: UIControlEvents.ValueChanged)
    self.refreshControl = refreshControl

func delay(delay:Double, closure:()->()) 
    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(delay * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(), closure)


func onRefresh() 
    delay(2, closure: 
        self.refreshControl.endRefreshing()
    )

override func viewDidAppear(animated:Bool)
    super.viewDidAppear(animated)


    let RottenTomatoesURLString = "http://api.rottentomatoes.com/api/public/v1.0/lists/dvds/top_rentals.json?apikey=rmvva9sq5s2tc2amv6db859f"
    let request = NSMutableURLRequest(URL: NSURL(string: RottenTomatoesURLString)!)
    if(isConnectedToNetwork())
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: (response, data, error) in
        var errorValue: NSError? = nil
       let dictionary = NSJSONSerialization.JSONObjectWithData(data, options: nil, error:
            &errorValue) as NSDictionary
        self.moviesArray = dictionary["movies"] as? NSArray
        self.tableView.reloadData()

    )
    
    else
        println("NO WIFI")
        var networkLabel = UILabel()
        networkLabel.text = "No Network Connection"
        //self.addSubView
    

    func isConnectedToNetwork() -> Bool 

    var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
    zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    let defaultRouteReachability = withUnsafePointer(&zeroAddress) 
        SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue()
    

    var flags: SCNetworkReachabilityFlags = 0
    if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 
        return false
    

    let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0
    let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequired)) != 0

    return (isReachable && !needsConnection) ? true : false

【参考方案1】：

由于 UITableView 的 refreshControl 属性是可选的，因此您必须在使用前解开它。您可以使用 ! 运算符展开，但更安全的方法是使用 ? 运算符展开，如果 refreshControl 为 nil，则不会导致运行时错误。

所以在你的 onRefresh 方法中改变...

self.refreshControl.endRefreshing()

到

self.refreshControl?.endRefreshing()

【讨论】：

我做了然后它给出了一个错误，说无法将表达式的类型'(IntegerLiteralConvertible,closure: () -> () -> $T3)' 转换为类型'Void'

似乎是一个编译器错误。如果您在该行上方添加任何内容，例如let a = 1 或println("test")，错误就会消失。很奇怪。