1. 设置页面的代理

class SecondViewController: TFBaseViewController,UIActionSheetDelegate {

  //底部警告框
    func testUIActionSheet()
    {
       let actionSheet = UIActionSheet()
        actionSheet.addButtonWithTitle("取消")
        actionSheet.addButtonWithTitle("确定")
        actionSheet.addButtonWithTitle("选择")
        actionSheet.cancelButtonIndex = 0
        actionSheet.delegate = self
        actionSheet.showInView(self.view)
    }
    
    func actionSheet(actionSheet: UIActionSheet,didDismissWithButtonIndex buttonIndex: Int){
        
      print("您点击了："+actionSheet.buttonTitleAtIndex(buttonIndex)!)
        
    }