我已经阅读了关于
的每一个帖子if(cell == nil)
但是这会引发无法比拟的错误。我已经尝试了几天让我的tableViewCells在它已经存在时停止重复。有人帮忙!!我的部分标题中的标题甚至重复并相互叠加。我假设我的图像也是重复的。当我在我的iphone上测试时，滚动都是滞后的。
ViewController.swift
import UIKit
import SwiftyJSON
import Alamofire
import AVFoundation
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var navigationBar: UINavigationItem!
@IBOutlet weak var tableView: UITableView!
var list = []
var audioPlayer:AVAudioPlayer!
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func getListBro() -> NSArray {
return list
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tableView.dataSource = self;
tableView.delegate = self;
self.tableView.rowHeight = UITableViewAutomaticDimension
let streamURL = NSURL(string: "http://localhost:8000/beat-stream-all/")!
let stuff = GetBeatStream(url:streamURL)
self.tableView.rowHeight = UITableViewAutomaticDimension;
self.tableView.estimatedRowHeight = 50.0; //
stuff.downloadJSONFromURL {
(let jsonDictionary) in
if let jsonList = jsonDictionary["results"] as? NSArray {
self.list = jsonList
}
let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0)) {
// do some task
dispatch_async(dispatch_get_main_queue()) {
// update some UI
self.tableView.reloadData()
}
}
}
}//end view did load
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("streamCell") as? StreamTableViewCell
if let beat_cover = list[indexPath.section] as? NSDictionary {
if let beat_cover_image = beat_cover["beat_cover"] as? String {
cell?.beatCover.image = UIImage(data: NSData(contentsOfURL: NSURL(string:beat_cover_image)!)!)
}
}
if let descriptionSection = list[indexPath.section] as? NSDictionary {
if let description = descriptionSection["description"] as! NSString? {
cell?.beatDescription.text = description as String
cell?.beatDescription.lineBreakMode = NSLineBreakMode.ByWordWrapping
}
}
if let audio = list[indexPath.section] as? NSDictionary {
if let audio_url = audio["audio"] as? String {
cell?.url = audio_url
cell?.buildPlayer()
}
}
return cell!
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return list.count
}
func tableView(tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
// USERNAME
let beatAuthorLabel = UILabel(frame: CGRectMake(55, 5, 200, 40))
//USER PIC
let profilePictureImageView = UIImageView(frame: CGRectMake(5, 5, 40, 40));
profilePictureImageView.layer.borderWidth = 0
profilePictureImageView.layer.masksToBounds = false
profilePictureImageView.layer.borderColor = UIColor.blackColor().CGColor
profilePictureImageView.layer.cornerRadius = profilePictureImageView.frame.height/2
profilePictureImageView.clipsToBounds = true
profilePictureImageView.layer.masksToBounds = true
if let userPicSection = list[section] as? NSDictionary {
if let artist = userPicSection["artist"] as? NSDictionary {
if let profilePic = artist["profile_pic"] as? String {
let image = UIImage(data: NSData(contentsOfURL: NSURL(string:profilePic)!)!)
profilePictureImageView.image = image;
}
}
}
if let nameSection = list[section] as? NSDictionary {
if let name = nameSection["artist"] as? NSDictionary {
if let adminName = name["admin_name"] as? NSString {
beatAuthorLabel.text = adminName as String
}
}
}
let dateLabel = UILabel(frame: CGRectMake(225, 5, 200, 40))
if let created = list[section] as? NSDictionary {
if let date = created["created_at"] as? String {
dateLabel.text = date as String
dateLabel.font = UIFont(name: dateLabel.font.fontName, size: 8)
}
}
let header: UITableViewHeaderFooterView = view as! UITableViewHeaderFooterView
header.addSubview(beatAuthorLabel)
header.addSubview(dateLabel)
header.contentView.addSubview(profilePictureImageView)
header.contentView.backgroundColor = UIColor(red: 179/255, green: 194/255, blue: 191/255, alpha:1)
header.textLabel!.textColor = UIColor.whiteColor()
header.alpha = 1
}
func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 50
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let indexPath = tableView.indexPathForSelectedRow
let currentCell = tableView.cellForRowAtIndexPath(indexPath!)! as! StreamTableViewCell
currentCell.player.play()
}
func tableView(tableView: UITableView, didEndDisplayingCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
let leavingCell = cell as! StreamTableViewCell
leavingCell.player.pause()
}
}