presention和presenting直接的通信
1:通过委托的方式,presention实例化一个交互方法的委托类,presenting的delegate指向presention
2:presenting直接调用presention的方法
//找Controller中的xxxMethod方法,找到后调用,优先在本类中招,找不到才往上游找
UIApplication.sharedApplication().sendAction("xxxMethod:", to: nil, from: self, forEvent: nil)