ios - 多次添加自定义 UITableView 部分

Question

我制作了一个自定义类，它向 UITableViewCell 添加了节标题和节内容。我设法让这些部分显示出来，但由于某些奇怪的原因，每个部分都添加了 5 次。

节项类

  class MainSectionItems: SectionItems {
            override init() {
                //super.init()
            }
        }
        class SectionItems:NSObject{
            var sections:[String] = []
            var artists:[[String]] = []
            var songs:[[String]] = []
            var imgUrl: [[String]] = []
            func addSection(section: String, artist:[String], song: [String], imageUrl: [String]){
                sections += [section]
                artists = artists + [artist]
                songs = songs + [song]
                imgUrl = imgUrl + [imageUrl]
            }
        }

主视图 Controller

    override func viewDidLoad() {
       getData{
                (msg) in
                self.menuItems.addSection("Featured Post", artist: self.artistArray, song: self.songNameArray, imageUrl: self.imgUrls)
              self.tVewCell.reloadData()
                self.collectionView.reloadData()
                    SwiftSpinner.hide()
                }
}

getData 是一种从 parse.com 检索 5 个对象的方法geData函数

func getData ( completionHandler: (String) -> ()) -> () {
        let query = PFQuery(className:"chordBankA")
        query.orderByDescending("Artist")
        query.limit = 5
        query.findObjectsInBackgroundWithBlock {
            (objects: [PFObject]?, error: NSError?) -> Void in
            if error == nil {
                for object in objects! {
                    self.artistArray.append((object.objectForKey("Artist")) as! String)
                    self.songNameArray.append(((object.objectForKey("Song")) as! String))
                    self.imgUrls.append(((object.objectForKey("imgUrl")) as! String))
        completionHandler("0");
                }
            } else {
                print("Error: \(error!) \(error!.userInfo)")
                completionHandler("1");
            }
        }

Answer 1

感谢您分享 getData 代码。您的问题是您在 for 循环中调用完成 block 。把它放在 for 循环外面，你应该会很好!