我正在尝试使用按钮将单元格添加到表格视图中。我所阅读和观看的所有内容都表明我所写的内容应该有效,但事实并非如此。有什么建议吗?
import UIKit
class RootViewController: UITableViewController, UITableViewDataSource, UITableViewDelegate {
private var cellPointSize: CGFloat!
private var albumsList: AlbumList!
private var albums:[Album]!
private let albumCell = "Album"
@IBOutlet var myTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
let preferredTableViewFont = UIFont.preferredFontForTextStyle(UIFontTextStyleHeadline)
cellPointSize = preferredTableViewFont.pointSize
albumsList = AlbumList.sharedAlbumList
albums = albumsList.albums
self.myTableView.dataSource = self
self.myTableView.delegate = self
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
tableView.reloadData()
}
// MARK: - Table view data source
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// Return the number of rows in the section.
return albums.count
}
override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return "Albums"
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = myTableView.dequeueReusableCellWithIdentifier(albumCell, forIndexPath: indexPath) as! UITableViewCell
//cell.textLabel?.font = fontForDisplay(atIndexPath: indexPath)
cell.textLabel?.text = albums[indexPath.row].name
cell.detailTextLabel?.text = albums[indexPath.row].artist
return cell
}
@IBAction func addNewAlbumAction(sender: UIBarButtonItem) {
var newAlbum = Album(nameIn: "New Title", yearIn: "New Year", artistIn: "New Artist", labelIn: "New Label")
albumsList.addAlbum(newAlbum)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.myTableView.reloadData()
})
}
func saveData(albumObject: Album) {
var archiveArray = NSMutableArray(capacity: albums.count)
for a in albums {
var albumEncodedObject = NSKeyedArchiver.archivedDataWithRootObject(a)
archiveArray.addObject(albumEncodedObject)
}
var userData = NSUserDefaults()
userData.setObject(archiveArray, forKey: "albums")
userData.synchronize()
}
我的相册数组正在正确添加数据。我可以在调试器中看到专辑。在应用程序加载后第一次调用委托方法。有什么想法吗?
答案 0 :(得分:0)
tableView:numberOfRowsInSection:
中,它会返回albums.count
但是按下按钮后,您可以将新的album
添加到albumsList
问题是,albums
无法获得更新。
所以我认为你应该返回albumsList.albums.count
。
并在tableView:cellForRowAtIndexPath:
中修改与albumsList.albums[indexPath.row]