1、UIPopover 使用

在要使用POPover的ViewController 继承UIPopoverPresentationControllerDelegate

使用方式：

        let storyboard : UIStoryboard = UIStoryboard(name: "Main",bundle: nil)
        let contentViewController :PopContainerViewController = storyboard.instantiateViewControllerWithIdentifier(
            "popContainerView")
            as! PopContainerViewController
        
        contentViewController.modalPresentationStyle=UIModalPresentationStyle.Popover
        contentViewController.preferredContentSize = contentViewController.view.bounds.size;
     
        let popPC:UIPopoverPresentationController=contentViewController.popoverPresentationController!
        popPC.permittedArrowDirections=UIPopoverArrowDirection.Left
        let originX:CGFloat = sender.layer.frame.width
        let originY:CGFloat = sender.layer.frame.height/2.0//设置箭头指向的位置
        popPC.sourceRect.origin=CGPoint(x:originX,y:originY)
        popPC.delegate=self;
        popPC.sourceView=sender as? UIView
        presentViewController(contentViewController,animated: true,completion: nil)

2、UIScrollView 使用

在要使用UIScrollView 的ViewController 继承UIScrollViewDelegate

	scrollView.frame.size=view.frame.size//设置scrollView 的窗口大小
	scrollView.backgroundColor=UIColor.greenColor()//用于调试
        scrollView.delegate=self
        scrollView.scrollEnabled=true
 <span style="white-space:pre">	</span>scrollView.contentSize=size//内容窗口大小