UI: scrollView 里面的图片 自动循环

UI: scrollView 里面的图片 自动循环, 当然要使用 计时器。

func showData(){
    
        scrollView.pagingEnabled = true
        
        scrollView.bounces = false
//这个功能好 

     
｀｀｀｀｀｀｀｀

        self.start()
        
    }
    

extension FPageBannerCell {





    
    func start() {
        
        
        
        self.timer = NSTimer(timeInterval: 2.0 , target: self, selector: #selector(nextPage(_:)) , userInfo: nil, repeats: true)
        
        
        NSRunLoop.mainRunLoop().addTimer(self.timer!, forMode: NSDefaultRunLoopMode)
        
        
        
    }
    
    
    
    
    
    func nextPage(timer: NSTimer){
        
        
        var page = self.pageControl.currentPage + 1
        
        if page == (bannerArray?.count)! {
        
            page = 0
        }
        
        self.scrollView.setContentOffset( CGPointMake(CGFloat(page)*kScreenWidth, 0)  , animated: true)
        
        
        
        
        
    }






    func stopTimer(){
    
    
    
        self.timer?.invalidate()
    
    
    }



    func scrollViewDidScroll(scrollView: UIScrollView) {
        
        let number = Int(  scrollView.contentOffset.x/kScreenWidth  +  0.5 )
        
        self.pageControl.currentPage = number
        
        
    }




    func scrollViewWillBeginDragging(scrollView: UIScrollView) {
        
        
        self.stopTimer()
        
    }
    
    
    
    
    
    func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        
        self.start()
        
    }





}