场景：我们在使用app的时候，特别是显示多张图片的时候，都会点击图片并进行浏览，比如QQ、微信，好友发表的动态，我们都会点击进去查看原图。现在很多app都支持图片浏览功能，这样更加方便用户体验，那么我们在项目开发过程中，怎么对图片点击进行预览，下面介绍一下在swift项目开发中使用SDPhotoBrowser进行图片浏览。

SDPhotoBrowser地址：https://github.com/gsdios/SDPhotoBrowser

下面直接代码进行说明

//
//  ShopStoreTableHeaderView.swift
//  SmartMilk
//
//  Created by lin jiang on 2017/7/11.
//  Copyright © 2017年 greengao. All rights reserved.
//

import UIKit

//添加SDPhotoBrowserDelegate代理
class ShopStoreTableHeaderView: UIView,UIScrollViewDelegate,SDPhotoBrowserDelegate {

    var storeImages:NSMutableArray = NSMutableArray()
    var mainScrollView:UIScrollView?
    var mainPageControl:UIPageControl?
    var mainTimer:Timer?
    
    var isMiddleShow:Bool = false
    
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        setScrollViewUI()
        setPageControlUI()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func setScrollViewUI(){
        self.mainScrollView = UIScrollView(frame: CGRect(x: 0,y: 0,width: self.width,height: self.height))
        
        // 添加到父视图
        self.addSubview(self.mainScrollView!)
        
        // 背景颜色
        //        arc4random()
        self.mainScrollView?.backgroundColor = UIColor.white
        
        
        // 自适应父视图
        // self.mainScrollView.autoresizingMask = UIViewAutoresizing.FlexibleHeight
        // 其他属性
        self.mainScrollView?.isScrollEnabled = true // 上下滚动
        self.mainScrollView?.scrollsToTop = true // 点击状态栏时，可以滚动回顶端
        self.mainScrollView?.bounces = true // 在最顶端或最底端时，仍然可以滚动，且释放后有动画返回效果
        mainScrollView?.isPagingEnabled = true // 分页显示效果
        mainScrollView?.showsHorizontalScrollIndicator = false // 显示水平滚动条
        mainScrollView?.showsVerticalScrollIndicator = true // 显示垂直滚动条
        mainScrollView?.indicatorStyle = UIScrollViewIndicatorStyle.white // 滑动条的样式
        // 设置内容大小
        // self.mainScrollView?.contentSize = CGSize(width: originX,height: scrollViewHeight)
        
        
        // 代理
        self.mainScrollView?.delegate = self
    }
    
    func setPageControlUI(){
        self.mainPageControl = UIPageControl(frame: CGRect(x: (self.width - 150.0) / 2,y: ((self.mainScrollView?.bounds)!.height - 20.0 - 10.0),width: 150.0,height: 20.0))
        
        // 添加到父视图
        self.addSubview(self.mainPageControl!)
        // 背景颜色
        self.mainPageControl?.backgroundColor = UIColor.clear
        
        // 其他属性设置
        self.mainPageControl?.numberOfPages = 0 // 总页数
        self.mainPageControl?.currentPage = 0 // 当前页数，默认为0，即第一个，实际数量是0~n-1
        self.mainPageControl?.pageIndicatorTintColor = UIColor.lightGray // 非当前页颜色
        self.mainPageControl?.currentPageIndicatorTintColor = UIColor.red // 当前页颜色

    }
    
    func setMainScrollViewPageControl(images:[StoreImageModel]) {
        self.storeImages.removeAllObjects()
        self.storeImages.addObjects(from: images)
        
        for view  in (self.mainScrollView?.subviews)! {
            view.removeFromSuperview()
        }
        var originX:CGFloat = 0.0
        for model in images
        {
            let imageView = UIImageView(frame: CGRect(x:originX,y:0.0,width:SCREEN_WIDTH,height:self.height))
            
            let url = URL(string: model.storeSmallImg!)
            
            let image = UIImage(named: "default_icon")
            
            // weak var weakSelf = self
            imageView.sd_setImage(with: url,placeholderImage: image,options: .retryFailed,completed: { (image,error,cacheType,URL) in
                
            })
            //添加UI Image View的点击事情
            let tap = UITapGestureRecognizer(target: self,action: #selector(onClickedImageEvent(gest:)))
            imageView.isUserInteractionEnabled = true
            
            imageView.addGestureRecognizer(tap)
            
            //主要是显示区分显示大点的图和小点的图
            if isMiddleShow == true{
                
                let contentView = UIView(frame: CGRect(x:originX,width:self.width,height:self.height))
                let imagexx = (SCREEN_WIDTH - self.height)/2
                
                imageView.frame = CGRect(x:imagexx,width:self.height,height:self.height)
                
                contentView.addSubview(imageView)
                self.mainScrollView?.addSubview(contentView)
                originX = (contentView.frame.minX + contentView.frame.width)
            }
            else
            {
                self.mainScrollView?.addSubview(imageView)
                
                originX = (imageView.frame.minX + imageView.frame.width)
            }
            
           
        }
        self.mainScrollView?.contentSize = CGSize(width: originX,height: self.height)
        
        self.mainPageControl?.numberOfPages = images.count // 总页数
        self.mainPageControl?.currentPage = 0 // 当前页数，默认为0，即第一个，实际数量是0~n-1
        
    }
    
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        MQLog(message:"6 scrollViewDidEndDecelerating")
        
        let width = scrollView.frame.width
        let offsetX = scrollView.contentOffset.x
        let index = offsetX / width
        MQLog(message:"当前页是：\(index)")
        
        self.mainPageControl?.currentPage = Int(index)
    }
    
    func addTimer()
    {
        self.mainTimer = Timer.scheduledTimer(timeInterval: 2.0,target: self,selector: #selector(autoShow),userInfo: nil,repeats: true)
    }
    
    func removerTimer()
    {
        if self.mainTimer != nil
        {
            self.mainTimer?.invalidate()
            self.mainTimer = nil
        }
    }
    
    
    func autoShow()
    {
        var page:Int = (self.mainPageControl?.currentPage)!
        let total = (self.mainPageControl?.numberOfPages)! - 1
        if total == page
        {
            page = 0
        }
        else
        {
            page += 1
        }
        
        // 设置偏移量
        let offsetX = CGFloat(page) * (self.mainScrollView?.frame)!.width
        self.mainScrollView?.setContentOffset(CGPoint(x:offsetX,y:0.0),animated: true)
        self.mainPageControl?.currentPage = page
    }
    
    
    func onClickedImageEvent(gest:UITapGestureRecognizer) {
        
        
        let browser = SDPhotoBrowser()
        
        //显示图片UIImageView的父控件
        browser.sourceImagesContainerView =  self.mainScrollView
        
        //显示图片的总数量
        browser.imageCount = self.storeImages.count
        
        //
        if self.storeImages.count > (self.mainPageControl?.currentPage)! {
            browser.currentImageIndex = (self.mainPageControl?.currentPage)!
        }
        else
        {
            //要显示的当前图片下标位置
            browser.currentImageIndex = 0
        }
        
        browser.delegate = self
        browser.show()
    }
    
    /**************************************************************/
    //返回当前UIImageView显示的图片
    func photoBrowser(_ browser: SDPhotoBrowser!,placeholderImageFor index: Int) -> UIImage! {
        
        if self.isMiddleShow{
            let contentView = self.mainScrollView?.subviews[index]
            let imageView:UIImageView = contentView?.subviews[0]as! UIImageView
            
            return imageView.image
        }
        else
        {
            let imageView:UIImageView = self.mainScrollView?.subviews[index]as! UIImageView
            
            return imageView.image
        }
        
    }
    
    //设置要显示图片资源的地址
    func photoBrowser(_ browser: SDPhotoBrowser!,highQualityImageURLFor index: Int) -> URL! {
        
        let model = self.storeImages[index] as! StoreImageModel
        
        let url = URL(string: model.storeBigImg!)
        
        return url
        
    }


}