tableviewcell的重用和自定义

*首先在viewcontroller中显示视图

import UIKit
import Kingfisher

class ViewController: UIViewController,UITableViewDelegate, UITableViewDataSource {

    var source : Array<NSDictionary>!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        creatview()
        showdata()
    }
    func creatview(){//创建tableview并显示
    
        let tableview = UITableView(frame: self.view.bounds, style: .Plain)
        self.view.addSubview(tableview)
        //注册cell1/cell2/cell3
        tableview.registerClass(cell1.self, forCellReuseIdentifier: "cell1")
        tableview.registerClass(cell2.self, forCellReuseIdentifier: "cell2")
        tableview.registerClass(cell3.self, forCellReuseIdentifier: "cell3")
        tableview.dataSource = self
        tableview.delegate = self
      
    }
    func showdata(){
        //获取本地数据
        let path = NSBundle.mainBundle().pathForResource("datasource", ofType: "json")
        let data = NSData(contentsOfFile: path!)
        //数据类型转换
        source = try! NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as? Array<NSDictionary>
    
    }
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return source.count
    }
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        //判断数据结构来创建不同的cell
        if source[indexPath.row]["imageurl3"] == nil{
            tableView.rowHeight = 150
            let cell = tableView.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath) as? cell1
            cell?.infoCell1(source[indexPath.row])
            return cell!
        }else{
            let cell = tableView.dequeueReusableCellWithIdentifier("cell2", forIndexPath: indexPath) as? cell2
            cell?.infoCell1(source[indexPath.row])
            return cell!
        }
    }
}

*然后自己定义一个tableviewcell的子类，不同的cell，考虑重用

import UIKit
import SnapKit

class cell1: UITableViewCell {
    var image12 : UIImageView!
    var title1 : UILabel!
    var des : UILabel!
    var data : Array<NSDictionary>!
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        //创建image12/title1/des并添加到cell中
        image12 = UIImageView()
        self.contentView.addSubview(image12)

        title1 = UILabel()
        self.contentView.addSubview(title1)
        //定义title1的约束
        title1.snp.makeConstraints { (make) in
            make.top.equalTo(self)
            make.left.equalTo(image12.snp.right).offset(20)
        }
        des = UILabel()
        self.contentView.addSubview(des)
        des.snp.makeConstraints { (make) in
            make.left.equalTo(image12.snp.right).offset(20)
            make.top.equalTo(self).offset(30)
            make.right.equalTo(self)
        }
        des.numberOfLines = 0//使其换行
        
        
    }
    //程序崩溃掉用
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    //引用自动布局
    override func layoutSubviews() {
        image12.snp.makeConstraints { (make) in
            make.left.top.bottom.equalTo(self)
            make.width.equalTo(self.snp.width).multipliedBy(0.3)
        }
    }
    //显示数据
    func infoCell1(data : NSDictionary){
        self.des.text = data["desc"] as? String
        self.title1.text = data["title"] as? String
        let path = data["imageurl"] as? String
        let url = NSURL(string: path!)
        self.image12.kf_setImageWithURL(url)
        
    }
}

*定义第二种cell

import UIKit


class cell2: UITableViewCell {

    var title : UILabel!
    
    var image1 : UIImageView!
    var image2 : UIImageView!
    var image3 : UIImageView!

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        image1 = UIImageView()
        self.contentView.addSubview(image1)
        image1.snp.makeConstraints { (make) in
            make.top.equalTo(self).offset(30)
            make.left.equalTo(self).offset(20)
            make.bottom.equalTo(self)
            make.width.equalTo(self.snp.width).multipliedBy(0.3)
        }
        image2 = UIImageView()
        self.contentView.addSubview(image2)
        image2.snp.makeConstraints { (make) in
            make.left.equalTo(image1.snp.right)
            make.bottom.top.width.equalTo(image1)
        }
        
        image3 = UIImageView()
        self.contentView.addSubview(image3)
        image3.snp.makeConstraints { (make) in
            make.left.equalTo(image2.snp.right)
            make.bottom.top.width.equalTo(image2)
        }
        
        
        title = UILabel()
        self.contentView.addSubview(title)
        title.snp.makeConstraints { (make) in
            make.left.top.equalTo(self)
            make.width.equalTo(self)
            make.bottom.equalTo(image1.snp.top)
        }
     
        
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    override func layoutSubviews() {

    }
    func infoCell1(data : NSDictionary){
        self.title.text = data["title"] as? String
        let path1 = data["imageurl1"] as? String
        let url1 = NSURL(string: path1!)!
        let path2 = data["imageurl2"] as? String
        let url2 = NSURL(string: path2!)!
        let path3 = data["imageurl3"] as? String
        let url3 = NSURL(string: path3!)!
        //自动下载显示图片
        self.image1.kf_setImageWithURL(url1)
        self.image2.kf_setImageWithURL(url2)
        self.image3.kf_setImageWithURL(url3)
    }
}