//        func touchesBegan(touches: Set<UITouch>, withEvent: UIEvent?) {
//            if self.target == nil {
//                return
//            }

像重写方法这种 把这个方法写在另外一个方法里就会没有重写

写代码的时候注意层级关系



    func addTarget(target:AnyObject?,action: Selector){
        self.target = target
        self.action = action
    }
    
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        if self.target == nil {
            
            return
        }
        
        //判断self.target是否实现了指定的方法
        if self.target!.respondsToSelector(self.action!) {
            
        self.target?.performSelector(self.action!, withObject: self)
            
            
        }else{
        
            print("按钮点击对应的方法没有实现")
        }
        
        
        
    }



懒加载
 

    lazy var imageArray: [UIImage] = {

            var tempArray = [UIImage]()

        for item in 1...15 {

            

            let image = UIImage.init(named: "32_\(item).jpg")

            tempArray.append(image!)

        }

        return tempArray

    }()



func btnAction(btn:YTButton) {
        
        let detail = DetailViewController()
        //传值
        detail.imageArray = self.imageArray
        
        //!!!在详情页隐藏底部的标签栏
        detail.hidesBottomBarWhenPushed = true
        
        //跳转
        self.navigationController?.pushViewController(detail, animated: true)
        
    }

类前面加static  要用类名才能调用 

 let str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

        let c = str.characters[str.startIndex.advancedBy(section)]



tabBarItems 和 tabBar.Items

 //显示箭头

            cell?.accessoryType = .DisclosureIndicator







---------------------
   //1.图片上的按钮被点击
    func deleteAction() {
        print("删除！！！！！")
        //将当前图片按钮从界面上移除
        self.removeFromSuperview()
        //发送消息通知视图控制器刷新界面
        NSNotificationCenter.defaultCenter().postNotificationName("reloadView", object: nil)
    }

    //注册成为观察者
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadView", name: "reloadView", object: nil)
--------

//拿到navigationBar上的按钮，根据状态决定要不要将图片放大
        let  btn = self.navigationItem.rightBarButtonItem?.customView as! UIButton
        if btn.currentTitle == "完成" {
            
            return
        }