分装头部菜单

效果图片：

1，头部滑动按钮封装：

//

//  CJWTopView.swift

//

//  Created by CJW on 16/12/23.

//  Copyright © 2016年 cjw. All rights reserved.

//

import UIKit

protocol CJWTopViewDelegate:class{

    func CJWTopViewClicked(topView:CJWTopView,currentIndex:Int)

}

private let kOnebtnW:CGFloat = KEYSEECENSIZE.width/3

class CJWTopView: UIView {

    private var titles = [String]()

    weak var delegate:CJWTopViewDelegate?

    private lazy var buttons:[UIButton] = [UIButton]()

    private var currentIndex : Int = 0

    //MARK:- 懒加载控件

    private lazy var bgScrollView:UIScrollView = {

        let scorllView:UIScrollView = UIScrollView()

        scorllView.backgroundColor = UIColor.yellowColor()

        scorllView.showsHorizontalScrollIndicator = false

        //scorllView上的按钮支持滑动；

        scorllView.panGestureRecognizer.delaysTouchesBegan = true

        return scorllView

    }()

    

    init(frame: CGRect,title:[String]) {

        self.titles = title

        super.init(frame: frame)

        setTopUpUI()

        

      }

    

    required init?(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }

}

//MARK:- 设置UI

extension CJWTopView

{

    //1

    private func setTopUpUI(){

        //添加背景的View

        addSubview(bgScrollView)

        bgScrollView.frame = bounds

        //scrollView的内容大小

        print("几个-\(self.titles.count)")

        let contentX:CGFloat = (kOnebtnW+10) * CGFloat(self.titles.count)

        bgScrollView.contentSize = CGSize(width: contentX+10, height: 0)

        

        //2

        setSubViewbtnFrame()

        

    }

    //2

    private func setSubViewbtnFrame(){

        

        let abtnY : CGFloat = 5.0

        let abtnH : CGFloat = 40

        var abtnX : CGFloat = 10

        for (index,title) in titles.enumerate(){

            print("index->\(index)")

            let abtn = UIButton()

            abtn.setTitle(title, forState:.Normal)

            abtn.tag = index

            abtn.backgroundColor = UIColor.lightGrayColor()

            abtn.layer.cornerRadius = 8.0

            

            abtnX = 10 + (kOnebtnW+10) * CGFloat(index)

            abtn.frame = CGRect(x: abtnX, y: abtnY, width: kOnebtnW, height: abtnH)

          

            

            bgScrollView.addSubview(abtn)

            buttons.append(abtn)

            

            //点击事件

            abtn.addTarget(self, action: #selector(oneBtnClicked(_:)), forControlEvents: .TouchUpInside)

        }

    

    }

}

//MARK:- 按钮的点击事件

extension CJWTopView

{

    func oneBtnClicked(button:UIButton) -> () {

        print("点击的第\(button.tag)个按钮")

        self.delegate?.CJWTopViewClicked(self, currentIndex: button.tag)

    }

}

// MARK:- 对外暴露的方法

extension CJWTopView {

    func setTitleWithProgress(progress : CGFloat, sourceIndex : Int, targetIndex : Int) {

        // .取出sourceLabel/targetLabel

        let sourceLabel = buttons[sourceIndex]

        let targetLabel = buttons[targetIndex]

        // 记录最新的index

        currentIndex = targetIndex

    }

}

2，下面VC的分装

//

//  CJWContentVCs.swift

//

//  Created by CJW on 16/12/23.

//  Copyright © 2016年 cjw. All rights reserved.

//

import UIKit

protocol CJWContentVCsDelegate : class {

    func pageContentView(contentView : CJWContentVCs, progress : CGFloat, sourceIndex : Int, targetIndex : Int)

}

private let collectViewID:String = "collectViewID"

class CJWContentVCs: UIView {

    private var childVCs : [UIViewController]

    private weak var persentVC:UIViewController?

    private var isForbidScrollDelegate : Bool = false

    private var startOffsetX : CGFloat = 0

    weak var delegate : CJWContentVCsDelegate?

    

    //MARK:- 懒加载控件

    private lazy var collectView : UICollectionView = {[weak self] in

        let layout = UICollectionViewFlowLayout()

        layout.itemSize = self!.bounds.size

        layout.minimumLineSpacing = 0

        layout.minimumInteritemSpacing = 0

        layout.scrollDirection = .Horizontal

        

        let conllectV:UICollectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: layout)

        conllectV.pagingEnabled = true

        conllectV.bounces = false

        conllectV.scrollsToTop = false

        conllectV.delegate = self

        conllectV.dataSource = self

        conllectV.showsVerticalScrollIndicator = false

        conllectV.showsHorizontalScrollIndicator = false

        conllectV.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: collectViewID)

        

        return conllectV

    

    }()

    

    init(frame: CGRect,childVCs:[UIViewController],persentVC:UIViewController) {

        self.childVCs = childVCs

        self.persentVC = persentVC

        

        super.init(frame: frame)

        

        setContentUI()

    }

    

    required init?(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }

    

    

}

//MARK:- 设置UI

extension CJWContentVCs

{

    private func setContentUI(){

        for childVc in childVCs{

            persentVC?.addChildViewController(childVc)

        }

        addSubview(collectView)

        collectView.frame = bounds

    }

}

//MARK:- collectionViewDelegate

extension CJWContentVCs:UICollectionViewDataSource

{

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return childVCs.count

    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(collectViewID, forIndexPath: indexPath)

        

        for view in cell.contentView.subviews {

            view.removeFromSuperview()

        }

        

        let child = childVCs[indexPath.item]

        child.view.frame = cell.contentView.bounds

        cell.contentView.addSubview(child.view)

        

        return cell

        

        

    }

}

// MARK:- 遵守UICollectionViewDelegate

extension CJWContentVCs : UICollectionViewDelegate {

    

    func scrollViewWillBeginDragging(scrollView: UIScrollView) {

        

        isForbidScrollDelegate = false

        

        startOffsetX = scrollView.contentOffset.x

    }

    

    func scrollViewDidScroll(scrollView: UIScrollView) {

        

        // 0.判断是否是点击事件

        if isForbidScrollDelegate { return }

        

        // 1.定义获取需要的数据

        var progress : CGFloat = 0

        var sourceIndex : Int = 0

        var targetIndex : Int = 0

        

        // 2.判断是左滑还是右滑

        let currentOffsetX = scrollView.contentOffset.x

        let scrollViewW = scrollView.bounds.width

        if currentOffsetX > startOffsetX { // 左滑

            // 1.计算progress

            progress = currentOffsetX / scrollViewW - floor(currentOffsetX / scrollViewW)

            

            // 2.计算sourceIndex

            sourceIndex = Int(currentOffsetX / scrollViewW)

            

            // 3.计算targetIndex

            targetIndex = sourceIndex + 1

            if targetIndex >= childVCs.count {

                targetIndex = childVCs.count - 1

            }

            

            // 4.如果完全划过去

            if currentOffsetX - startOffsetX == scrollViewW {

                progress = 1

                targetIndex = sourceIndex

            }

        } else { // 右滑

            // 1.计算progress

            progress = 1 - (currentOffsetX / scrollViewW - floor(currentOffsetX / scrollViewW))

            

            // 2.计算targetIndex

            targetIndex = Int(currentOffsetX / scrollViewW)

            

            // 3.计算sourceIndex

            sourceIndex = targetIndex + 1

            if sourceIndex >= childVCs.count {

                sourceIndex = childVCs.count - 1

            }

        }

        

        // 3.将progress/sourceIndex/targetIndex传递给titleView

        delegate?.pageContentView(self, progress: progress, sourceIndex: sourceIndex, targetIndex: targetIndex)

    }

}

// MARK:- 对外暴露的方法

extension CJWContentVCs {

    func setCurrentIndex(currentIndex : Int) {

        

        // 1.记录需要进制执行代理方法

        isForbidScrollDelegate = true

        

        // 2.滚动正确的位置

        let offsetX = CGFloat(currentIndex) * collectView.frame.width

        collectView.setContentOffset(CGPoint(x: offsetX, y: 0), animated: false)

    }

}

3，使用这两个

//

//  ViewController.swift

//

//  Created by CJW on 16/12/23.

//  Copyright © 2016年 cjw. All rights reserved.

//

import UIKit

class ViewController: UIViewController {

    

    private lazy var topView:CJWTopView = {

        let topFrame:CGRect = CGRect(x: 0, y: 20, width: KEYSEECENSIZE.width, height: 50)

        let titles:[String] = ["第一页","第二页","第三页","第四页","第五页","写几个","就有几个"]

        let topV = CJWTopView(frame: topFrame, title: titles)

        topV.delegate = self

        return topV

    }()

    

    

    private lazy var contionView:CJWContentVCs = {

        let contentFrame:CGRect = CGRect(x: 0, y: 20+50, width: KEYSEECENSIZE.width, height: KEYSEECENSIZE.height-70)

        var childVCs = [UIViewController]()

        for _ in 0...6{

            let vc = UIViewController()

            vc.view.backgroundColor = UIColor(r:CGFloat(arc4random_uniform(255)),g:CGFloat(arc4random_uniform(255)),b:CGFloat(arc4random_uniform(255)))

            childVCs.append(vc)

             }

        let contenV = CJWContentVCs(frame: contentFrame, childVCs: childVCs, persentVC: self)

        return contenV

    }()

    

    

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

   

        self.view.addSubview(topView)

        self.view.addSubview(contionView)

        

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}

extension ViewController:CJWTopViewDelegate{

    func CJWTopViewClicked(topView: CJWTopView, currentIndex: Int) {

        contionView.setCurrentIndex(currentIndex)

    }

}