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服务器之家 - 编程语言 - Swift - swift3.0实现图片放大缩小动画效果

swift3.0实现图片放大缩小动画效果

2021-03-29 15:42水桶前辈 Swift

这篇文章主要为大家详细介绍了swift3.0实现图片放大缩小动画效果,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

一. 内容说明

      跟我之前这篇类似,只不过那篇是oc版本,这篇是swift版本 oc版本链接地址

目的:通过kingfisher请求5张图片,展示出来。然后利用图片放大缩小管理类展示图片,多张图片可以滑动浏览

效果图如下,想看动态的效果图,请看上面链接中的oc版本效果图,跟这篇是一样的。

本demo,只加载本地图片的demo下载链接 ,需要加载网络图片的,需要下载kingfisher

swift3.0实现图片放大缩小动画效果

swift3.0实现图片放大缩小动画效果

二.源码展示

0. 图片测试demo源码

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import foundation
import uikit
 
class ljphotogroupviewcontroller : tfbaseviewcontroller{
 
  lazy var ljarray : [ljphotoinfo] = [ljphotoinfo]()
  let ljurlarray = ["http://pica.nipic.com/2007-12-12/20071212235955316_2.jpg",
           "http://d.lanrentuku.com/down/png/1706/10avatars-material-pngs/avatars-material-man-4.png",
           "http://image.nationalgeographic.com.cn/2017/0703/20170703042329843.jpg",
           "http://image.nationalgeographic.com.cn/2015/0121/20150121033625957.jpg",
           "http://image.nationalgeographic.com.cn/2017/0702/20170702124619643.jpg"]
   
  override func viewdidload() {
    super.viewdidload()
     
    self.settopnavbartitle("图片浏览测试demo")
    self.settopnavbackbutton()
    self.setui()
  }
}
 
extension ljphotogroupviewcontroller{
  func setui(){
     
    for index in 0...4{
       
      //1.加载本地图片
      //let image = uiimage.init(named: "\(index + 1).jpg")
      let showimageview = uiimageview.init()
      //showimageview.image = image
      showimageview.tag = index
      showimageview.frame = cgrect(x: int((appwidth - 200)/2.0), y: 80 + int(90 * index), width: 200, height: 80)
      showimageview.isuserinteractionenabled = true
      view.addsubview(showimageview)
       
      //2.加载本地图片
      let url = url(string:ljurlarray[index])
      showimageview.kf.setimage(with: url)
       
      let gestrue = uitapgesturerecognizer.init(target: self, action: #selector(ljphotogroupviewcontroller.showclicked(_:)))
      showimageview.addgesturerecognizer(gestrue)
       
      //需要浏览的图片添加到数组
      let info = ljphotoinfo.init()
      info.largeimageurlstr = ljurlarray[index]
      info.thumbimageview = showimageview
      info.currentselectindex = index
      self.ljarray.append(info)
    }
  }
}
 
extension ljphotogroupviewcontroller{
   
  func showclicked(_ sender : uitapgesturerecognizer){
    if self.ljarray.count > 0 {
      let index = sender.view?.tag
      let photogroupview = ljphotogroupview.init(frame: cgrect(x: 0, y: 0, width: appwidth, height: appheight))
      photogroupview.setdata(self.ljarray, selectedindex: index!)
      photogroupview.showphotoview()
       
      chdebuglog("-------\(string(describing: index))")
    }
  }
}

1. ljphotogroupview:图片浏览管理类,用于展示图片

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import foundation
import uikit
 
class ljphotogroupview: uiview {
   
  let baseindex = 1000
   
  var originframe : cgrect? // 图片的源尺寸
  var currentindex : nsinteger = 0 //当前选中的图片index
  var ljphotoarray : [any] = [any]()//存储多组需要加载的图片原始信息
   
  lazy var ljscrollview : uiscrollview = {
    let view = uiscrollview.init(frame: cgrect(x: 0, y: 0, width: appwidth, height: appheight))
    view.delegate = self
    view.ispagingenabled = true
    view.backgroundcolor = uicolor.yellow
    return view
  }()
   
  override init(frame: cgrect) {
    super.init(frame: frame)
    self.addsubview(self.ljscrollview)
  }
 
  func setdata(_ photoarray : array<any>, selectedindex : nsinteger) {
    self.ljscrollview.contentsize = cgsize(width: floor(appwidth) * cgfloat(photoarray.count), height: appheight)
    self.currentindex = selectedindex
    self.ljphotoarray = photoarray
  }
   
  required init?(coder adecoder: nscoder) {
    fatalerror("init(coder:) has not been implemented")
  }
}
 
extension ljphotogroupview {
 
// mark: -- 图片cell复用
  func dequeuereusablecell() -> ljphotoview {
     
    var cell = self.viewwithtag(baseindex + self.currentindex) as? ljphotoview
     
    if ljphotoarray.count > currentindex {
      let info = ljphotoarray[currentindex] as? ljphotoinfo
      let tempimageview = info?.thumbimageview
 
      if cell != nil{
        self.originframe = tempimageview?.convert((tempimageview?.bounds)!, to: self)
        return cell!
      }
       
      cell = ljphotoview.init(frame: cgrect(x: floor(appwidth)*cgfloat(currentindex), y: 0, width: appwidth, height: appheight))
      self.originframe = tempimageview?.convert((tempimageview?.bounds)!, to: self)
    }
    return cell!
  }
  
// mark: -- 展示图片
  func showphotoview(){
     
    uiapplication.shared.keywindow?.rootviewcontroller?.view.addsubview(self)
    self.backgroundcolor = uicolor.black
   
    let cell1 = self.dequeuereusablecell()
    cell1.tag = self.baseindex + self.currentindex
     
    var ljtempimage : uiimage?
    if ljphotoarray.count > currentindex {
      let info = ljphotoarray[currentindex] as? ljphotoinfo
      ljtempimage = info?.thumbimageview?.image
    }
     
    ljtempimage = (ljtempimage != nil) ? ljtempimage : uiimage.init(named: "pic_broadcast_gray_square")
     
    let tfimageview = uiimageview.init(image: ljtempimage)
    tfimageview.frame = self.originframe ?? cgrect.zero
    tfimageview.clipstobounds = true
    tfimageview.backgroundcolor = uicolor.red
    tfimageview.contentmode = .scaleaspectfit
    self.addsubview(tfimageview)
     
    //添加页面消失的手势
    let tap = uitapgesturerecognizer.init(target: self, action: #selector(hideimageview))
    self.addgesturerecognizer(tap)
     
    uiview.animate(withduration: 0.25, animations: {
      let y : cgfloat? = (appheight - (ljtempimage?.size.height)! * appwidth / (ljtempimage?.size.width)!)/2.0
      let height : cgfloat? = (ljtempimage?.size.height)! * appwidth / (ljtempimage?.size.width)!
      tfimageview.frame = cgrect(x: 0, y: y!, width: appwidth, height: height!)
    }) { (finish) in
      //根据选中第几张图片直接展示出来
      let cell = self.dequeuereusablecell()
      cell.tag = self.baseindex + self.currentindex
      cell.backgroundcolor = uicolor.gray
       
      if self.ljphotoarray.count > self.currentindex{
        cell.setcurrentimageview(self.ljphotoarray[self.currentindex] as! ljphotoinfo)
      }
      let x : cgfloat = cgfloat(self.currentindex) * floor(appwidth);
      self.ljscrollview.setcontentoffset(cgpoint.init(x: x, y: 0), animated: false)
      self.ljscrollview.addsubview(cell)
       
       
      tfimageview.removefromsuperview()
    }
  }
   
// mark: -- 移除图片
  func hideimageview(){
    let cell = self.viewwithtag(baseindex + currentindex) as? ljphotoview
    uiview.animate(withduration: 0.25, animations: {
      cell?.ljimageview.frame = self.originframe!
    }) { (finish) in
      self.backgroundcolor = uicolor.white
      self.removefromsuperview()
    }
  }
}
 
extension ljphotogroupview : uiscrollviewdelegate{
   
  func scrollviewdidscroll(_ scrollview: uiscrollview) {
    //滑动时,会调用多次
  }
   
  func scrollviewdidenddecelerating(_ scrollview: uiscrollview) {
   //滑动完毕时,只会调用一次
    let page = self.ljscrollview.contentoffset.x / self.frame.size.width;
    self.currentindex = nsinteger(page);
    print("scrollviewdidenddecelerating当前页数----\(page)")
     
    let cell = self.dequeuereusablecell()
    cell.tag = self.baseindex + int(page)
    if self.ljphotoarray.count > self.currentindex{
      cell.setcurrentimageview(self.ljphotoarray[self.currentindex] as! ljphotoinfo)
    }
    self.ljscrollview.addsubview(cell)
  }
}

2. ljphotoinfo:图片信息的model

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import foundation
import uikit
 
class ljphotoinfo: nsobject {
   
  var currentselectindex : int?
  var largeimageurlstr : string?
  var thumbimageview : uiimageview?
   
  override init() {
    super.init()
  }
}

3.ljphotoview:图片浏览管理类用到的cell(图片显示)

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import foundation
import uikit
 
class ljphotoview: uiscrollview {
   
  var ljinfo : ljphotoinfo?
   
  lazy var ljimageview : uiimageview = {
      let view = uiimageview()
      view.clipstobounds = true
      view.contentmode = .scaleaspectfit
      return view
    }()
   
  override init(frame: cgrect) {
    super.init(frame: frame)
    self.zoomscale = 1.0
    self.addsubview(self.ljimageview)
  }
   
  required init?(coder adecoder: nscoder) {
    fatalerror("init(coder:) has not been implemented")
  }
}
 
extension ljphotoview{
  func setcurrentimageview(_ info : ljphotoinfo){
    self.ljinfo = info
    if self.ljinfo?.thumbimageview?.image == nil{
      self.ljinfo?.thumbimageview?.image = uiimage.init(named: "pic_broadcast_gray_square")
    }
     
    //无url,则通过thumbimageview获取image展示
    //self.ljimageview.image = info.thumbimageview.image;
    let y : cgfloat? = (appheight - (info.thumbimageview?.image?.size.height)! * appwidth / (info.thumbimageview?.image?.size.width)!) * 0.5;
    self.ljimageview.frame = cgrect(x: 0, y: y!, width: appwidth, height: appwidth*(info.thumbimageview?.image?.size.height)!/(info.thumbimageview?.image?.size.width)!)
    self.ljimageview.image = self.ljinfo?.thumbimageview?.image
     
    if info.largeimageurlstr != "" {
      let url = url(string:info.largeimageurlstr!)
      self.ljimageview.kf.setimage(with: url)
    }
  }
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://blog.csdn.net/robinson_911/article/details/77979467

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