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###QYOptionButton### ######模仿新浪微博的中间选择按钮###### ####使用步骤####

1. tabbarViewController中添加如下代码

   _ = QYOptionButton(tabbar: self.tabBar, forItemIndex: 2, delegate: self)

2. 实现QYOptionButton的代理方法

    func QYOptionNumberOfOptionButtonItem(optionButton: QYOptionButton) -> Int {
    	return 7
    }
    
    func QYOptionItemAtIndex(optionButton: QYOptionButton, itemAtIndex index: Int) -> QYOptionItem {
    let optionItem = QYOptionItem(frame: CGRectMake(0, 0, 64, 64))
    optionItem.setImage(UIImage(named: "icon_holder"), forState: UIControlState.Normal)
    //为该按钮添加事件
    //optionItem.addTarget(self, action: #selector(anAction), forControlEvents: UIControlEvents.TouchUpInside)
    	return optionItem
    }
   
    //调整OptionButton上下的位置
    func QYOptionAdjustUpAndDownForOptionButtonItem(optionButton: QYOptionButton) -> CGFloat {
    	return 0
    }
   
    func QYOptionNormalImage(optionButton: QYOptionButton) -> UIImage {
    	return UIImage(named: "middle_selected")!
    }
   
    func QYOptionSelectedImage(optionButton: QYOptionButton) -> UIImage {
      return UIImage(named: "middle_selected")!
    }
   

####演示####