1.字典转模型

// MARK: - 内部控制方法
    private func loadData()
    {
            NetworkTools.shareInstance.loadStatuses { (array, error) -> () in
                // 1.安全校验
                if error != nil
                {
                    SVProgressHUD.showErrorWithStatus("获取微博数据失败", maskType: SVProgressHUDMaskType.Black)
                    return
                }
                guard let arr = array else
                {
                    return
                }
                
                // 2.将字典数组转换为模型数组
                var models = [Status]()
                for dict in arr
                {
                    let status = Status(dict: dict)
                    models.append(status)
                }
                NJLog(models)
                
        }
    }



Status.swift

import UIKit

class Status: NSObject {
    /// 微博创建时间
    var created_at: String?
    
    /// 字符串型的微博ID
    var idstr: String?
    
    /// 微博信息内容
    var text: String?
    
    /// 微博来源
    var source: String?
    
    /// 微博作者的用户信息
    var user: User?
    
    init(dict: [String: AnyObject])
    {
        super.init()
        setValuesForKeysWithDictionary(dict)
    }
    
    /// KVC的setValuesForKeysWithDictionary方法内部会调用setValue方法
    override func setValue(value: AnyObject?, forKey key: String) {
        
        NJLog("key = \(key), value = \(value)")
        // 1.拦截user赋值操作
        if key == "user"
        {
            user = User(dict: value as! [String : AnyObject])
            return
        }
        super.setValue(value, forKey: key)
    }
    override func setValue(value: AnyObject?, forUndefinedKey key: String) {
        
    }
    
    override var description: String {
        let property = ["created_at", "idstr", "text", "source"]
        let dict = dictionaryWithValuesForKeys(property)
        return "\(dict)"
    }
    
}




User.swift

import UIKit

class User: NSObject {
    /// 字符串型的用户UID
    var idstr: String?
    
    /// 用户昵称
    var screen_name: String?
    
    /// 用户头像地址（中图），50×50像素
    var profile_image_url: String?
    
    /// 用户认证类型
    var verified_type: Int = -1
    
    init(dict: [String: AnyObject])
    {
        super.init()
        setValuesForKeysWithDictionary(dict)
    }
    override func setValue(value: AnyObject?, forUndefinedKey key: String) {
        
    }
    
    override var description: String {
        let property = ["idstr", "screen_name", "profile_image_url", "verified_type"]
        let dict = dictionaryWithValuesForKeys(property)
        return "\(dict)"
    }

}

2.UITabelView的相关方法

extension HomeTableViewController
{
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.statuses?.count ?? 0
    }
    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        // 1.取出cell
        let cell = tableView.dequeueReusableCellWithIdentifier("homeCell", forIndexPath: indexPath) as! HomeTableViewCell
        // 2.设置数据
        cell.status = statuses![indexPath.row]
        // 3.返回cell
        return cell
    }
}




HomeTableViewCell.swift
import UIKit
import SDWebImage

class HomeTableViewCell: UITableViewCell {

    /// 头像
    @IBOutlet weak var iconImageView: UIImageView!
    /// 认证图标
    @IBOutlet weak var verifiedImageView: UIImageView!
    /// 昵称
    @IBOutlet weak var nameLabel: UILabel!
    /// 会员图标
    @IBOutlet weak var vipImageView: UIImageView!
    /// 时间
    @IBOutlet weak var timeLabel: UILabel!
    /// 来源
    @IBOutlet weak var sourceLabel: UILabel!
    /// 正文
    @IBOutlet weak var contentLabel: UILabel!
    
    /// 模型数据
    var status: Status?
        {
        didSet{
            // 1.设置头像
            if let urlStr = status?.user?.profile_image_url
            {
                let url = NSURL(string: urlStr)
                iconImageView.sd_setImageWithURL(url)
            }
            // 2.设置认证图标
            if let type = status?.user?.verified_type
            {
                var name = ""
                switch type
                {
                case 0:
                    name = "avatar_vip"
                case 2, 3, 5:
                    name = "avatar_enterprise_vip"
                case 220:
                    name = "avatar_grassroot"
                default:
                    name = ""
                }
                verifiedImageView.image = UIImage(named: name)
            }
            
            
            // 3.设置昵称
            nameLabel.text = status?.user?.screen_name
            
            // 4.设置会员图标
            if let rank = status?.user?.mbrank
            {
                if rank >= 1 && rank <= 6
                {
                    vipImageView.image = UIImage(named: "common_icon_membership_level\(rank)")
                    nameLabel.textColor = UIColor.orangeColor()
                }else
                {
                    vipImageView.image = nil
                    nameLabel.textColor = UIColor.blackColor()
                }
                
            }
            
            // 5.设置时间
            /**
            刚刚(一分钟内)
            X分钟前(一小时内)
            X小时前(当天)
            
            昨天 HH:mm(昨天)
            
            MM-dd HH:mm(一年内)
            yyyy-MM-dd HH:mm(更早期)
            */
            // "Sun Dec 06 11:10:41 +0800 2015"
            timeLabel.text = "刚刚" //status?.created_at
            if let timeStr = status?.created_at
            {
//                timeStr = "Sun Dec 05 12:10:41 +0800 2014"
                
                // 1.将服务器返回的时间格式化为NSDate
                let formatter = NSDateFormatter()
                formatter.dateFormat = "EE MM dd HH:mm:ss Z yyyy"
                // 如果不指定以下代码, 在真机中可能无法转换
                formatter.locale = NSLocale(localeIdentifier: "en")
                let createDate = formatter.dateFromString(timeStr)!
                
                // 创建一个日历类
               let calendar = NSCalendar.currentCalendar()
                /*
                // 该方法可以获取指定时间的组成成分 |
                let comps = calendar.components([NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day], fromDate: createDate)
                NJLog(comps.year)
                NJLog(comps.month)
                NJLog(comps.day)
                */

                var result = ""
                var formatterStr = "HH:mm"
                if calendar.isDateInToday(createDate)
                {
                    // 今天
                    // 3.比较两个时间之间的差值
                    let interval = Int(NSDate().timeIntervalSinceDate(createDate))
                    
                    if interval < 60
                    {
                        result = "刚刚"
                    }else if interval < 60 * 60
                    {
                       result = "\(interval / 60)分钟前"
                    }else if interval < 60 * 60 * 24
                    {
                       result = "\(interval / (60 * 60))小时前"
                    }
                }else if calendar.isDateInYesterday(createDate)
                {
                    // 昨天
                    formatterStr = "昨天 " + formatterStr
                    formatter.dateFormat = formatterStr
                    result = formatter.stringFromDate(createDate)
                }else
                {
                    // 该方法可以获取两个时间之间的差值
                    let comps  = calendar.components(NSCalendarUnit.Year, fromDate: createDate, toDate: NSDate(), options: NSCalendarOptions(rawValue: 0))
                    if comps.year >= 1
                    {
                        // 更早时间
                        formatterStr = "yyyy-MM-dd " + formatterStr
                    }else
                    {
                        // 一年以内
                        formatterStr = "MM-dd " + formatterStr
                    }
                    formatter.dateFormat = formatterStr
                    result = formatter.stringFromDate(createDate)
                }
                
                timeLabel.text = result
            }
            
            // 6.设置来源
            // "<a href=\"http://app.weibo.com/t/feed/2cEJdS\" rel=\"nofollow\">IT之家</a>"
            // 来自: IT之家
            if let sourceStr: NSString = status?.source where sourceStr != ""
            {
                // 6.1获取从什么地方开始截取
                let startIndex = sourceStr.rangeOfString(">").location + 1
                // 6.2获取截取多长的长度
                let length = sourceStr.rangeOfString("<", options: NSStringCompareOptions.BackwardsSearch).location - startIndex
                
                // 6.3截取字符串
                let rest = sourceStr.substringWithRange(NSMakeRange(startIndex, length))
                
                sourceLabel.text = "来自: " + rest
            }
            
            
            // 7.设置正文
            contentLabel.text = status?.text
            
        }
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // 1.设置正文最大宽度
        contentLabel.preferredMaxLayoutWidth = UIScreen.mainScreen().bounds.width - 2 * 10
    }

    
}

3.MVVM

       设置数据
        cell.viewModel = statuses![indexPath.row]
        

 // 2.将字典数组转换为模型数组
                var models = [StatusViewModel]()
                for dict in arr
                {
                    let status = Status(dict: dict)
                    let viewModel = StatusViewModel(status: status)
                    models.append(viewModel)
                }




StatusViewModel.swift

import UIKit

/*
M: 模型(保存数据)
V: 视图(展现数据)
C: 控制器(管理模型和视图, 桥梁)
VM:
作用: 1.可以对M和V进行瘦身
      2.处理业务逻辑
*/
class StatusViewModel: NSObject {
    /// 模型对象
    var status: Status
    
    init(status: Status)
    {
        self.status = status
        
        // 处理头像
        icon_URL = NSURL(string: status.user?.profile_image_url ?? "")
        
        // 处理会员图标
        if status.user?.mbrank >= 1 && status.user?.mbrank <= 6
        {
            mbrankImage = UIImage(named: "common_icon_membership_level\(status.user!.mbrank)")
        }
        
        // 处理认证图片
        switch status.user?.verified_type ?? -1
        {
        case 0:
            verified_image = UIImage(named: "avatar_vip")
        case 2, 3, 5:
            verified_image = UIImage(named: "avatar_enterprise_vip")
        case 220:
            verified_image = UIImage(named: "avatar_grassroot")
        default:
            verified_image = nil
        }
        
        // 处理来源
        if let sourceStr: NSString = status.source where sourceStr != ""
        {
            // 6.1获取从什么地方开始截取
            let startIndex = sourceStr.rangeOfString(">").location + 1
            // 6.2获取截取多长的长度
            let length = sourceStr.rangeOfString("<", options: NSStringCompareOptions.BackwardsSearch).location - startIndex
            
            // 6.3截取字符串
            let rest = sourceStr.substringWithRange(NSMakeRange(startIndex, length))
            
            source_Text = "来自: " + rest
        }
        
        // 处理时间
        // "Sun Dec 06 11:10:41 +0800 2015"
        if let timeStr = status.created_at where timeStr != ""
        {
            // 1.将服务器返回的时间格式化为NSDate
            let createDate = NSDate.createDate(timeStr, formatterStr: "EE MM dd HH:mm:ss Z yyyy")
            
            // 2.生成发布微博时间对应的字符串
            created_Time = createDate.descriptionStr()
        }

    }
    
    /// 用户认证图片
    var verified_image: UIImage?
    
    /// 会员图片
    var mbrankImage: UIImage?

    /// 用户头像URL地址
    var icon_URL: NSURL?
    
    /// 微博格式化之后的创建时间
    var created_Time: String = ""
    
    /// 微博格式化之后的来源
    var source_Text: String = ""
}





HomeTableViewCell.swift
import UIKit
import SDWebImage

class HomeTableViewCell: UITableViewCell {

    /// 头像
    @IBOutlet weak var iconImageView: UIImageView!
    /// 认证图标
    @IBOutlet weak var verifiedImageView: UIImageView!
    /// 昵称
    @IBOutlet weak var nameLabel: UILabel!
    /// 会员图标
    @IBOutlet weak var vipImageView: UIImageView!
    /// 时间
    @IBOutlet weak var timeLabel: UILabel!
    /// 来源
    @IBOutlet weak var sourceLabel: UILabel!
    /// 正文
    @IBOutlet weak var contentLabel: UILabel!
    
    /// 模型数据
    var viewModel: StatusViewModel?
        {
        didSet{
            // 1.设置头像
          
            iconImageView.sd_setImageWithURL(viewModel?.icon_URL)
            
            // 2.设置认证图标
           
            verifiedImageView.image = viewModel?.verified_image
            
            // 3.设置昵称

            nameLabel.text = viewModel?.status.user?.screen_name
            
            // 4.设置会员图标
            vipImageView.image = nil
            nameLabel.textColor = UIColor.blackColor()

            if let image = viewModel?.mbrankImage
            {
                vipImageView.image = image
                nameLabel.textColor = UIColor.orangeColor()
            }
            // 5.设置时间
           
            timeLabel.text = viewModel?.created_Time
            
            // 6.设置来源
            
            sourceLabel.text = viewModel?.source_Text
            
            // 7.设置正文
            contentLabel.text = viewModel?.status.text
            
        }
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // 1.设置正文最大宽度
        contentLabel.preferredMaxLayoutWidth = UIScreen.mainScreen().bounds.width - 2 * 10
    }

    
}

4.缓存微博图片

 /// 缓存微博配图
    private func cachesImages(viewModels: [StatusViewModel])
    {
        // 0.创建一个组
        let group = dispatch_group_create()
        
        for viewModel in viewModels
        {
            // 1.从模型中取出配图数组
            guard let picurls = viewModel.thumbnail_pic else
            {
                 // 如果当前微博没有配图就跳过, 继续下载下一个模型的
                continue
            }
            // 2.遍历配图数组下载图片
            for url in picurls
            {
                // 将当前的下载操作添加到组中
                dispatch_group_enter(group)
                
                // 3.3利用SDWebImage下载图片
                
                SDWebImageManager.sharedManager().downloadImageWithURL(url, options: SDWebImageOptions(rawValue: 0), progress: nil, completed: { (image, error, _, _, _) -> Void in
                    NJLog("图片下载完成")
                    // 将当前下载操作从组中移除
                    dispatch_group_leave(group)
                })
            }
        }
        
        // 监听下载操作
        dispatch_group_notify(group, dispatch_get_main_queue()) { () -> Void in
            NJLog("全部下载完成")
            self.statuses = viewModels
        }
    }

5.微博配图

 // 9.1更新cell的尺寸
            if itemSize != CGSizeZero
            {
                flowLayout.itemSize = itemSize
            }
            // 9.2跟新collectionView尺寸
            pictureCollectionViewHeightCons.constant = clvSize.height
            pictureCollectionViewWidthCons.constant = clvSize.width


 // MARK: - 内部控制方法
    /// 计算cell和collectionview的尺寸
    private func calculateSize() -> (CGSize, CGSize)
    {
        /*
        没有配图: cell = zero, collectionview = zero
        一张配图: cell = image.size, collectionview = image.size
        四张配图: cell = {90, 90}, collectionview = {2*w+m, 2*h+m}
        其他张配图: cell = {90, 90}, collectionview =
        */
        let count = viewModel?.thumbnail_pic?.count ?? 0
        // 没有配图
        if count == 0
        {
            return (CGSizeZero, CGSizeZero)
        }
        
        // 一张配图
        if count == 1
        {
            let key = viewModel!.thumbnail_pic!.first!.absoluteString
            // 从缓存中获取已经下载好的图片, 其中key就是图片的url
            let image = SDWebImageManager.sharedManager().imageCache.imageFromDiskCacheForKey(key)
            return (image.size, image.size)
        }
        
        let imageWidth: CGFloat = 90
        let imageHeight: CGFloat = 90
        let imageMargin: CGFloat = 10
        // 四张配图
        if count == 4
        {
            let col = 2
            let row = col
            // 宽度 = 图片的宽度 * 列数 + (列数 - 1) * 间隙
            let width = imageWidth * CGFloat(col) + CGFloat(col - 1) * imageMargin
            // 宽度 = 图片的高度 * 行数 + (行数 - 1) * 间隙
            let height = imageHeight * CGFloat(row) + CGFloat(row - 1) * imageMargin
            return (CGSize(width: imageWidth, height: imageHeight), CGSize(width: width, height: height))
        }
        
        // 其他张配图
        let col = 3
        let row = (count - 1) / 3 + 1
        // 宽度 = 图片的宽度 * 列数 + (列数 - 1) * 间隙
        let width = imageWidth * CGFloat(col) + CGFloat(col - 1) * imageMargin
        // 宽度 = 图片的高度 * 行数 + (行数 - 1) * 间隙
        let height = imageHeight * CGFloat(row) + CGFloat(row - 1) * imageMargin
        return (CGSize(width: imageWidth, height: imageHeight), CGSize(width: width, height: height))
        
    }

extension HomeTableViewCell: UICollectionViewDataSource
{
    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return viewModel?.thumbnail_pic?.count ?? 0
    }
    
    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("pictureCell", forIndexPath: indexPath) as! HomePictureCell
//        cell.backgroundColor = UIColor.redColor()
        
        cell.url = viewModel!.thumbnail_pic![indexPath.item]
        return cell
    }
}

class HomePictureCell: UICollectionViewCell {
    
    var url: NSURL?
        {
        didSet
        {
            customIconImageView.sd_setImageWithURL(url)
        }
    }
    
    @IBOutlet weak var customIconImageView: UIImageView!
    
}