1、 设置圆角

    //设置圆角
    func setRadius(item:UIView,radius:CGFloat){
        item.layer.cornerRadius=radius
        item.layer.masksToBounds=true
    }

    例如：<p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;"><span style="color: rgb(147,200,106);">   </span><span style="color:#333333;"> setRadius(headerImgOne,radius: headerImgOne.frame.width/2)</span></p>

 <pre name="code" class="plain">        //设置背景阴影
        panelView.layer.backgroundColor=UIColor.whiteColor().CGColor
        panelView.layer.shadowColor=UIColor.blackColor().CGColor
        panelView.layer.shadowOffset=CGSizeMake(0,0)
        panelView.layer.shadowOpacity=0.2
        panelView.layer.shadowRadius=4

3、View 代码切换

        let mainStoryboard=UIStoryboard(name:"Main",bundle:NSBundle.mainBundle())
        let mainCenterViewController=mainStoryboard.instantiateViewControllerWithIdentifier("MainCenterViewController") as UIViewController
        self.presentViewController(mainCenterViewController,animated: true,completion: nil)

新建Controller 选择 Alsocreate XIB file 保存 就会发现有 xx.xib文件产生，controller 中使用

        //实例化一个信息界面
        let controller = InfoViewController(nibName:"InfoViewController",bundle:nil)
        //信息界面出现的动画方式
        controller.modalTransitionStyle = UIModalTransitionStyle.CoverVertical
        //界面跳转
        self.presentViewController(controller,animated:true,completion:nil)