RefreshControl 释放时不流畅

Posted 2023-03-15

【中文标题】RefreshControl 释放时不流畅

【英文标题】：RefreshControl not smooth when release

【发布时间】：2016-03-17 12:46:43

【问题描述】：

我正在尝试将 refreshControl 连接到 Rest api，以便每次刷新时都会更新内容。然而，即使它有效，当您释放 refreshControl 时，它似乎会导致非常滞后且不流畅的体验。这是为什么呢？

刷新时调用的方法

func refreshTableView() 
    self.lastLoadedPage = 1
    proposeAccess(true, success: 
        self.refresher?.endRefreshing()
    )

提议访问在 refreshTableView 中调用的定位服务

func proposeAccess(refresh: Bool,
    success doneCallback:() -> Void
    ) 
    proposeToAccess(.Always, agreed: 

        LocationService.turnOn()

        //Get Latest position
        LocationService.sharedManager.afterUpdatedLocation =  newLocation in

            //Turn off Update User Location
            LocationService.turnOff()

            self.lastLocation = newLocation
            self.updateOrganizations(refresh)


        
        doneCallback()

        , rejected: 
            self.alertCanNotAccessLocation()
            doneCallback()
    )

ProposeAccess 中调用的UpdateOrganizations

func updateOrganizations(refresh: Bool) 
    let realm = try! Realm()


    GetOrganization.request(String(self.lastLoadedPage), limit: String(limit), location: self.lastLocation!, radius: String(100), refresh: refresh,
    success:  numberOfResults in


        //Sort by distance
        self.organizationArray = GetOrganization.sortOrganizationsByDistanceFromLocation(realm.objects(Organization), location: self.lastLocation!)


        print(self.lastLoadedPage)
       self.lastLoadedPage = self.lastLoadedPage + 1


    , error: 
        self.organizationArray = GetOrganization.sortOrganizationsByDistanceFromLocation(realm.objects(Organization), location: self.lastLocation!)


    )

在 UpdateOrganization 中调用 GetOrganization 请求

static func request(
lastPage: String,
limit: String,
location: CLLocation,
radius: String,
refresh: Bool,
success successCallback:() -> Void,
error errorCallback:() -> Void
) 

    Provider.request(.Organizations(lastPage, limit,location.coordinate.longitude, location.coordinate.latitude, radius))  result in
        switch result 
        case let .Success(response):

            do 
                try response.filterSuccessfulStatusCodes()
                let data = try JSON(response.mapJSON())



                let orgArray = data["organizations"]
                let scale = UIScreen.mainScreen().scale
                let cache = Shared.dataCache


                let realm = try! Realm()

                if refresh == true 
                    clearOrganizations()
                

                try! realm.write 

                    for (_, item) in orgArray 

                        if let id = item["id"].int,
                            let address = item["address"].string,
                            let zipCode = item["zip_code"].string,
                            let name = item["name"].string,
                            let longitude = item["longitude"].double,
                            let latitude = item["latitude"].double,
                            let logoArray = item["logo"].dictionary,
                            let coverPhotoArray = item["cover_photo"].dictionary

                        
                            var logo: String?
                            var coverPhoto: String?

                            switch scale 
                            case 1.0:
                                logo = logoArray["small"]!.string
                                coverPhoto = coverPhotoArray["small"]!.string
                            case 2.0:
                                logo = logoArray["medium"]!.string
                                coverPhoto = coverPhotoArray["medium"]!.string
                            case 3.0:
                                logo = logoArray["large"]!.string
                                coverPhoto = coverPhotoArray["large"]!.string
                            default:
                                break
                            

                            if let logoUrl = NSURL(string: logo!),
                                let coverPhotoUrl = NSURL(string: coverPhoto!) 

                                    if let logoData = NSData(contentsOfURL: logoUrl),
                                        let coverPhotoData = NSData(contentsOfURL: coverPhotoUrl) 

                                            let logoCache = "logo-\(id)"
                                            let coverPhotoCache = "cover-\(id)"

                                            cache.set(value: logoData, key: logoCache)
                                            cache.set(value: coverPhotoData, key: coverPhotoCache)



                                            let organization = Organization()
                                            organization.id = id
                                            organization.name = name
                                            organization.address = address
                                            organization.zipCode = zipCode
                                            organization.longitude = longitude
                                            organization.latitude = latitude
                                            organization.logo = logoCache
                                            organization.coverPhoto = coverPhotoCache


                                            realm.add(organization, update: true)






                                     else 
                                        //return error

                                    



                             else 
                                //return error

                            




                         else 
                            //return error

                        

                    
                
                successCallback()




            
            catch 
                errorCallback()
            



        case .Failure(_):
            errorCallback()

        
    

【参考方案1】：

考虑做这样的事情

            self.refreshControl.performSelector(#selector(UIRefreshControl.endRefreshing), withObject: nil, afterDelay: 0.00)

我尝试使用下面的缩写签名，但没有得到想要的结果

            self.refreshControl.performSelector(#selector(UIRefreshControl.endRefreshing))

另外，使用 iPhone 5 模拟器时，桌子似乎不时完全缩回，但我不知道这是否是模拟器问题。我无法在手机上复制它。

【讨论】：

哇哇哇哇哇哇哇哇。惊人的！为什么它有效？我在 *** 上尝试了很多解决方案，但是这一行就像一个魅力！谢啦兄弟！ Xcode 9.0, swift 4.0 - “endRefreshing”的平滑动画 - 工作！