libr-ios/librx/ExploreTableViewController.swift

//  ExploreTableViewController.swift
//
//  librx
//
//  Created by Yunlong Zheng on 15/10/25.
//  Copyright © 2015年 librx. All rights reserved.
//

import UIKit

class ExploreTableViewController: UITableViewController {

    private var postsLoader = PostsLoader(.Default)
    private var explores:[ExploreSource] = []
    
    private var targetPost:Post?
    private var targetUserId:Int?
    private var targetUserName:String?
    
    var dataUrl:String?
    
    override func viewDidLoad() {
        super.viewDidLoad()
         self.navigationController?.navigationBar.tintColor = UIColor.whiteColor()
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        self.navigationController?.navigationBarHidden = false
        self.navigationController?.setNavigationBarHidden(false, animated: true)
        
        refreshContent()
        self.tableView.reloadData()
    }
    
    override func prefersStatusBarHidden() -> Bool {
        return false
    }
    
    func refreshContent() {
        loadPostsFromUrl(self.dataUrl!)
        self.tableView.reloadData()
    }
    
    func loadPostsFromUrl(dataUrl: String) {
        
        postsLoader.loadExploreSourcesFromUrl(url: dataUrl) {  [weak self](sources) -> () in
            if let selfView = self {
                selfView.explores = sources
                selfView.tableView.reloadData()
            }
        }
        
    }
    
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return explores.count
    }
    
    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        
        if (indexPath.row == self.explores.count) {
            self.loadMoreData()
            return cellForLoadMore(cellForRowAtIndexPath: indexPath)
        }else{
            return cellForRowsInSection(cellForRowAtIndexPath: indexPath)
        }
        
    }
    
    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        
        if let indexPath = self.tableView.indexPathForSelectedRow{
            let source = self.explores[indexPath.row]
            if source.source_type == "post" {
                targetPost = Post(id: source.id, title: source.title)
                performSegueWithIdentifier("showPostDetailsSegue", sender: self)
            }else if source.source_type == "user" {
                targetUserId = source.id
                targetUserName = source.title
                performSegueWithIdentifier("showUserDetailsSegue", sender: self)
            }
    
        }
        
    }
    
    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        
        if self.explores.count==0 {
        
            let messageLabel: UILabel = UILabel.init(frame: CGRect(x: 10, y: 0, width: self.view.bounds.size.width, height: self.view.bounds.size.height))
            messageLabel.text = "当前没有可显示的内容，请下拉刷新"
            messageLabel.font.fontWithSize(10.0)
            messageLabel.textColor = UIColor.lightGrayColor()
            messageLabel.numberOfLines = 0
            messageLabel.textAlignment = NSTextAlignment.Center
            messageLabel.sizeToFit()
            self.tableView.backgroundView = messageLabel
            self.tableView.separatorStyle = UITableViewCellSeparatorStyle.None;
    
        }else {
            self.tableView.separatorStyle = UITableViewCellSeparatorStyle.SingleLine;
            self.tableView.backgroundView = nil
            return 1;
        }
        return 0;
        
    }
    
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    
        if segue.identifier == "showPostDetailsSegue" {
            let destinationController = segue.destinationViewController as! WebViewController
            destinationController.post = targetPost
        } else if segue.identifier == "showUserDetailsSegue" {
            let destinationController = segue.destinationViewController as! ProfileViewController
            destinationController.userId = targetUserId
            destinationController.isMe = false
            destinationController.forceHiddenBackButton = true
            destinationController.title = ""
        }
        
    }
    
    func loadMoreData() {
        
        print("load more data....")
        
    }
    
    func cellForLoadMore(cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        
        let cell = UITableViewCell.init(style: UITableViewCellStyle.Default, reuseIdentifier: "moretag")
        
        let label = UILabel.init(frame: CGRectMake(0, 10, self.view.frame.width, 20))
        label.text = "加载更多"
        label.backgroundColor = UIColor.clearColor()
        label.textAlignment = .Center
        label.font = label.font.fontWithSize(14.0)
        label.tintColor = UIColor.blueColor()
        
        cell.contentView.addSubview(label)
        
        let activityView = UIActivityIndicatorView.init(frame: CGRectMake(0, 30 ,self.view.frame.width,30.0))
        activityView.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
        activityView.hidesWhenStopped = false
        activityView.startAnimating()
        
        cell.contentView.addSubview(activityView)
        return cell
    }
    
    func cellForRowsInSection(cellForRowAtIndexPath indexPath: NSIndexPath) -> ExploreTableCell {
        
        let source = explores[indexPath.row] as ExploreSource
        
        let cellIdentifier = "Cell"
        let cell = self.tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath:indexPath) as! ExploreTableCell
        
        let thumbnailUrl = NSURL(string: source.img)
        
        cell.sourceTitle.text = source.title
        cell.sourceTitle.lineBreakMode = NSLineBreakMode.ByWordWrapping
        cell.sourceTitle.numberOfLines = 2
        
        cell.sourceImg.sd_setImageWithURL(thumbnailUrl, placeholderImage: UIImage(named: "default"))
        
        cell.sourceImg.layer.cornerRadius = cell.sourceImg.frame.size.width / 2
        cell.sourceImg.clipsToBounds = true
        cell.sourceImg.layer.borderWidth = 1
        cell.sourceImg.layer.borderColor = UIColor.whiteColor().CGColor
        
        cell.descriptionLabel.text = source.description
        
        return cell
        
    }
    
}