swift 广告banner 轮播图
很久没有写swift ，今天简单写个广告轮播图，有问题欢迎留言
class JWAdvertisingScrollView: UIView , UIScrollViewDelegate {
private var csScroll:UIScrollView = UIScrollView()
private var csPagecontroll:UIPageControl = UIPageControl()
lazy private var dataArray:NSMutableArray = NSMutableArray()
private static let ResidenceTime = 5.0
override init(frame: CGRect) {
super.init(frame: frame)
isUserInteractionEnabled = true
csScroll.frame = self.bounds
csScroll.scrollsToTop = true
csScroll.isPagingEnabled = true
csScroll.isUserInteractionEnabled = true
csScroll.showsHorizontalScrollIndicator = false
csScroll.showsVerticalScrollIndicator = false
addSubview(csScroll)
csPagecontroll.frame = CGRect(x: self.width/2-30, y: self.height-20, width: 60, height: 20)
csPagecontroll.pageIndicatorTintColor = UIColor(red: 235.0/255.0, green: 235.0/255.0, blue: 235.0/255.0, alpha: 1)
csPagecontroll.currentPageIndicatorTintColor = UIColor.red
csPagecontroll.addTarget(self, action: #selector(scrollToIndex(page:)), for: UIControl.Event.valueChanged)
addSubview(csPagecontroll)
let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(singleTapGestureRecognizer))
tapGesture.numberOfTapsRequired = 1
csScroll.addGestureRecognizer(tapGesture)
}
/* 点击方法
**/
@objc private func singleTapGestureRecognizer(){
print(csScroll)
}
//刷新页面
public func reloadSubviews(data:NSArray?){
if data == nil {
return
}
if data!.count < 1 {
return
}
dataArray.removeAllObjects()
let arr = NSMutableArray(array: data!)
dataArray.addObjects(from: arr as! [Any])
setUpSubViews()
}
private func setUpSubViews(){
let imageItems:NSArray? = dataArray
let imgCount:Int = ((imageItems?.count)!)
if imgCount > 1 {
csPagecontroll.isHidden = false
csPagecontroll.numberOfPages = imgCount
}else{
csPagecontroll.isHidden = true
csPagecontroll.numberOfPages = 1
}
csScroll.delegate = self
csPagecontroll.currentPage = 0
csScroll.contentSize = CGSize(width: self.width * CGFloat(imgCount), height: self.height)
for aview in csScroll.subviews {
aview.removeFromSuperview()
}
for i in 0 ..< imgCount {
let imageview:UIImageView = UIImageView(frame: CGRect(x: CGFloat(i)*csScroll.width, y: 0, width: csScroll.width, height: csScroll.height))
imageview.contentMode = UIView.ContentMode.scaleAspectFill
let dict:NSDictionary? = (imageItems?.object(at: i) as! NSDictionary)
if dict != nil {
let urlStr:String = dict?.object(forKey: "image") as! String
if urlStr.nullObject() == false {
imageview.sd_setImage(with: URL(string: urlStr), completed: nil)
}
}
imageview.clipsToBounds = true
csScroll.addSubview(imageview)
}
csScroll.contentOffset = CGPoint(x: 0, y: 0 )
start()
}
//停止滚动
private func stop() {
NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(switchFocusImageItems), object: nil)
}
//开始滚动
private func start() {
let imageItems:NSArray? = dataArray
if (imageItems?.count)! > 1 {
self.perform(#selector(switchFocusImageItems), with: nil, afterDelay: JWAdvertisingScrollView.ResidenceTime)
}
}
//滚动后执行
@objc private func switchFocusImageItems() {
stop()
let targetX:CGFloat = csScroll.contentOffset.x + csScroll.frame.size.width
let imageItems:NSArray? = dataArray
let imgCount:Int = (imageItems?.count)!
var point_x:Int = Int(Int(targetX/self.width) * Int(self.width))
if point_x >= Int((self.width * CGFloat(imgCount))) {
point_x = 0;
}
moveToTargetPosition(targetX: CGFloat(point_x))
start()
}
//设置位置
private func moveToTargetPosition(targetX:CGFloat){
csScroll.setContentOffset(CGPoint(x: targetX, y: 0), animated: true)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let targetX = csScroll.contentOffset.x
let imageItems:NSArray? = dataArray
let imgCount:Int = (imageItems?.count)!
if targetX >= (self.width * CGFloat(imgCount)) {
csPagecontroll.currentPage = imgCount - 1
}else if targetX <= 0 {
csPagecontroll.currentPage = 0
}else{
let page:Int = Int ((scrollView.contentOffset.x + self.width/2.0)/self.width)
csPagecontroll.currentPage = page
}
}
@objc private func scrollToIndex(page:UIPageControl) {
let csIndex:Int = page.currentPage
moveToTargetPosition(targetX: self.width*(CGFloat(csIndex)))
page.currentPage = csIndex
}
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
}
// 调用方法
let adview = JWAdvertisingScrollView(frame: CGRect(x: 0, y: 0, width: kScreenW, height: kScreenW/2))
adview.reloadSubviews(data: adsArray)
