最近项目中有类似QQ好友列表功能，整理了一下，话不多说，直接上代码

import UIKit

class QQFriend: NSObject {
var name: String?
var intro: String?

init(dic: NSDictionary) {  
    super.init()  
    self.setValuesForKeys(dic as! \[String : AnyObject\])  
}  

}

import UIKit

class QQFriendGroup: NSObject {
var name: String?
var friends: NSArray?
var isOpen: Bool? = false

init(withDic dic: NSDictionary) {  
    super.init()  
    self.setValuesForKeys(dic as! \[String : AnyObject\])  
    let arrayFriend: NSMutableArray = NSMutableArray()

    for friendDic in self.friends! {  
        let friend : QQFriend = QQFriend.init(dic: friendDic as! NSDictionary)  
        arrayFriend.add(friend)  
    }  
    self.friends = arrayFriend  
}

}

import UIKit
//协议
protocol QQHeaderViewDelegate: NSObjectProtocol {
func headerViewDidClickedNameLab(headerView:QQHeaderView)
}

class QQHeaderView: UITableViewHeaderFooterView {
weak var delegate:QQHeaderViewDelegate?

var nameLabel: UILabel? = {  
   let nameLabel = UILabel()  
   return nameLabel  
}()

var arrow: UIImageView? = {  
    let arrow = UIImageView.init(image: UIImage(named: "orderDown"))  
    return arrow  
}()

var group: QQFriendGroup? {  
    didSet {  
        self.nameLabel?.text = group?.name  
        didMoveToSuperview()  
    }  
}

var clickNameBlock: ((Void)->())? = nil  
var dividerView : UIView! = nil

class func headerViewWithTableView(tableview: UITableView) -> QQHeaderView {  
    let headerID = "myHeader"  
    var header = tableview.dequeueReusableHeaderFooterView(withIdentifier: headerID)  
    if header == nil {  
        header = QQHeaderView.init(reuseIdentifier: headerID)  
    }  
    return header as! QQHeaderView  
}

override init(reuseIdentifier: String?) {  
    super.init(reuseIdentifier: reuseIdentifier)

    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(QQHeaderView.nameClick))  
    self.nameLabel?.isUserInteractionEnabled = true  
    self.arrow?.isUserInteractionEnabled = true  
    self.contentView.addGestureRecognizer(tap)  
    self.contentView.addSubview(nameLabel!)  
    self.contentView.addSubview(arrow!)

    let divideView = UIFactory.create\_AView()  
    divideView.backgroundColor = UIColor.hrgb("cccccc")  
    self.contentView.addSubview(divideView)  
    self.dividerView = divideView

}

required init?(coder aDecoder: NSCoder) {  
    fatalError("init(coder:) has not been implemented")  
}  
//点击展开或收起列表  
func nameClick() {  
    self.group?.isOpen = !(self.group?.isOpen)!  

// if ((self.delegate?.responds(to: Selector(("headerViewDidClickedNameLab:")))) != nil) {
// self.delegate?.headerViewDidClickedNameLab(headerView: self)
// }
if self.clickNameBlock != nil {
self.clickNameBlock!()
}
}

override func didMoveToSuperview() {  
    super.didMoveToSuperview()  
    if self.group?.isOpen == true {  
        self.arrow?.transform = CGAffineTransform.init(rotationAngle: .pi)  
    }else {  
        self.arrow?.transform = CGAffineTransform.init(rotationAngle: 0)  
    }  
}

override func layoutSubviews() {  
    super.layoutSubviews()  
    self.nameLabel?.snp.makeConstraints({ (make) in  
        make.left.equalTo(15)  
        make.top.equalTo(0)  
        make.bottom.equalTo(0)  
        make.right.equalTo(-30)  
    })  
    self.arrow?.snp.makeConstraints({ (make) in  
        make.right.equalTo(-10)  
        make.width.height.equalTo(14)  
        make.centerY.equalTo(self.height \* 0.5)  
    })  
    self.dividerView.snp.makeConstraints { (make) in  
        make.height.equalTo(0.5)  
        make.left.right.bottom.equalTo(0)  
    }  
}

}

import UIKit

extension ImitationQQ {
func numberOfSections(in tableView: UITableView) -> Int {
return (self.groups?.count)!
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let group: QQFriendGroup = self.groups![section] as! QQFriendGroup
return group.isOpen == true ? group.friends!.count : 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell : UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "default", for: indexPath)
cell.textLabel?.text = "\(indexPath.section)" + "\(indexPath.row)"
cell.selectionStyle = .none
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 40
}
func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
return 0.01
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let header: QQHeaderView = QQHeaderView.headerViewWithTableView(tableview: tableView)
header.delegate = self
header.clickNameBlock = {
self.tabView.reloadData()
}
header.group = self.groups![section] as? QQFriendGroup
return header
}

func tableView(\_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {  
    return 44  
}  

}

extension ImitationQQ {
func headerViewDidClickedNameLab(headerView: QQHeaderView) {
self.tabView.reloadData()
}
}

class ImitationQQ: UIViewController, UITableViewDataSource, UITableViewDelegate, QQHeaderViewDelegate {
var tabView: UITableView! = nil
var dividerView : UIView! = nil
lazy var groups : NSArray? = {
var arr : NSMutableArray = NSMutableArray()
for i in 0..<3 {
let group: QQFriendGroup = QQFriendGroup.init(withDic: ["name":"\(i)" + "组", "friends":[["name":"00","intro":"挺好的"],["name":"01","intro":"挺好好的"],["name":"02","intro":"挺好好好的"],["name":"03","intro":"挺好好好好的"]]] as NSDictionary)
arr.add(group)
}
return arr
}()

override func viewDidLoad() {  
    super.viewDidLoad()

    self.view.backgroundColor = UIColor.hrgb("f4f4f4")  
    self.title = "好友列表"

    let tabView = UIFactory.create\_ATableView(frame: CGRect.init(x: 0, y: 0.5, width: Screen\_Width, height: kScreenHeight-64.5), delegate: self, dataSource: self, superView: self.view, type: .plain)  
    tabView.backgroundColor = UIColor.hrgb("f4f4f4")  
    tabView.register(UITableViewCell.self, forCellReuseIdentifier: "default")  
    self.tabView = tabView

    let divideView = UIFactory.create\_AView()  
    divideView.frame = CGRect(x: 0, y: 0, width: Screen\_Width, height: 0.5)  
    divideView.backgroundColor = UIColor.hrgb("cccccc")  
    self.view.addSubview(divideView)  
    self.dividerView = divideView

}

}

直接粘代码即可运行