前言: 这篇你可以学会自定义视图,创建collectionView,协议的使用,定时器;
自制图片
先上Demo:Github上封装好的下载即用, 好用请Star Thanks
首先新建一个继承于UIView的视图, 且用collectionView实现所以需要签订两个协议代码如下:
let sectionNum: Int = 100 // 区的数量
let width = UIScreen.mainScreen().bounds.size.width // 屏幕宽度
let height = UIScreen.mainScreen().bounds.size.width // 屏幕高度
// 因为要实现轮播图片可以点击定义一个协议
// 协议
protocol XTCycleViewDelegate {
func didSelectIndexCollectionViewCell(index: Int)->Void
}
class XTCycleScrollView: UIView, UICollectionViewDelegate, UICollectionViewDataSource{
使用到的变量以及创建视图
var delegate: XTCycleViewDelegate?
var cycleCollectionView: UICollectionView?
var images = NSMutableArray()
var pageControl = UIPageControl()
var flowlayout = UICollectionViewFlowLayout()
var timer = NSTimer()
override init(frame: CGRect) {
super.init(frame: frame)
self.createSubviews(frame)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
布局必要的UI以及创建定时器
func createSubviews(frame: CGRect){
cycleCollectionView = UICollectionView.init(frame: CGRectMake(0, 0, frame.size.width, frame.size.height), collectionViewLayout: flowlayout)
flowlayout.itemSize = CGSizeMake(frame.size.width, frame.size.height);
flowlayout.minimumInteritemSpacing = 0;
flowlayout.minimumLineSpacing = 0;
flowlayout.scrollDirection = UICollectionViewScrollDirection.Horizontal;
cycleCollectionView!.backgroundColor = UIColor.lightGrayColor()
cycleCollectionView!.pagingEnabled = true
cycleCollectionView!.dataSource = self
cycleCollectionView!.delegate = self
cycleCollectionView!.showsHorizontalScrollIndicator = false
cycleCollectionView!.showsVerticalScrollIndicator = false
cycleCollectionView!.registerClass(ZJCustomCycleCell.self, forCellWithReuseIdentifier: "cellId")
self.addSubview(cycleCollectionView!)
pageControl = UIPageControl.init(frame: CGRectMake(0, 0, frame.size.width / 2, 30))
pageControl.center = CGPointMake(frame.size.width / 2, frame.size.height - 20);
self.addSubview(pageControl);
self.addTimer()
}
定时器初始化
func addTimer(){
let timer1 = NSTimer.init(timeInterval: 2, target: self, selector: "nextPageView", userInfo: nil, repeats: true)
NSRunLoop.currentRunLoop().addTimer(timer1, forMode: NSRunLoopCommonModes)
timer = timer1
}
销毁定时器
func removeTimer(){
self.timer.invalidate()
}
实现循环滚动
func returnIndexPath()->NSIndexPath{
var currentIndexPath = cycleCollectionView!.indexPathsForVisibleItems().last
currentIndexPath = NSIndexPath.init(forRow: (currentIndexPath?.row)!, inSection: sectionNum / 2)
cycleCollectionView!.scrollToItemAtIndexPath(currentIndexPath!, atScrollPosition: UICollectionViewScrollPosition.Left, animated: false)
return currentIndexPath!;
}
func nextPageView(){
let indexPath = self.returnIndexPath()
var item = indexPath.row + 1;
var section = indexPath.section;
if item == images.count {
item = 0
section++
}
self.pageControl.currentPage = item;
let nextIndexPath = NSIndexPath.init(forRow: item, inSection: section)
cycleCollectionView!.scrollToItemAtIndexPath(nextIndexPath, atScrollPosition: UICollectionViewScrollPosition.Left, animated: true)
}
collectionView Delegate
// 重用池
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
// 这里使用的自定义cell, 下面会贴出自定义cell代码
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cellId", forIndexPath: indexPath) as! ZJCustomCycleCell
// 这个Label实现显示数字,表示是第几张图片
cell.labelTitle.text = NSString(format: "%d", indexPath.row) as String
// 这里是图片赋值
let url:String = self.images[indexPath.row] as! String
// 这里我使用的是一个赋值图片的三方库,看自己喜好,为方便我没有自己写
cell.imageView.hnk_setImageFromURL(NSURL.init(string: url)!)
return cell
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return sectionNum
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// 在这里给出了pageControl的数量
pageControl.numberOfPages = images.count
return images.count
}
// 重新添加定时器
func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
self.addTimer()
}
// 手动滑动的时候销毁定时器
func scrollViewWillBeginDragging(scrollView: UIScrollView) {
self.removeTimer()
}
设置当前的pagecontrol
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
let page = (Int(scrollView.contentOffset.x) / Int(width)) % images.count
pageControl.currentPage = page
}
点击方法
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
self.delegate?.didSelectIndexCollectionViewCell(indexPath.row)
}
下面是我在自定义cell中的代码
var urlImage: String = ""
var imageView = UIImageView()
var labelTitle = UILabel()
override init(frame: CGRect) {
super.init(frame: frame)
self.createSubviews(frame)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func createSubviews(frame: CGRect){
imageView = UIImageView.init(frame: CGRectMake(0, 0, frame.size.width, frame.size.height))
self.contentView.addSubview(imageView)
labelTitle = UILabel.init(frame: CGRectMake(10, 10, 30, 30))
imageView.addSubview(labelTitle)
}
封装基本完成了, 下面看看如何使用
// 创建
let cycle = XTCycleScrollView.init(frame: CGRectMake(0, 70, width, 175))
// 要实现点击需要制定代理人
cycle.delegate = self;
// 图片链接数组
let images: NSMutableArray = ["", "", "", ""]
// 数组赋值
cycle.images = images
self.view.addSubview(cycle)
实现代理方法
func didSelectIndexCollectionViewCell(index: Int) {
print("\\(index)")
}
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