OSI七层网络模型:
1.应用层.2.表示层.3.会话层.4.传输层.5.网络层.6.数据链路层.7.物理层

pragma mark ---输入框

-(void)footerTextView{
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(10, SCR_H - 160, 60, 40)];
[btn setBackgroundColor:[UIColor yellowColor]];
[btn setTitle:@"常用语" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[self addSubview:btn];
self.texView = [[UITextView alloc]initWithFrame:CGRectMake(btn.frame.origin.x + 60 + 10, SCR_H - 160, SCR_W / 2 + 30, 40)];
self.texView.delegate = self;
[self addSubview:self.texView];

}

• (void)textViewDidEndEditing:(UITextView *)textView{
  NSLog(@"结束编辑");
  NSDictionary *dic = @{@"leftStr":self.texView.text};
  Model *model = [[Model alloc]init];
  [model setValuesForKeysWithDictionary:dic];
  [self.dataArray addObject:model];
  [self.tableView reloadData];
  }

• (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
  {
  if ([text isEqualToString:@"\n"])
  {

    // 将model对象加入到数组红
    if (self.texView.text.length > 1) {
        NSDictionary *dic = @{@"leftStr":self.texView.text};
        Model *model = [[Model alloc]init];
        [model setValuesForKeysWithDictionary:dic];
        [self.dataArray addObject:model];
        [self.tableView reloadData];
        self.texView.text = @"";
    }
    
    
    // 对内容清零
    [self.texView resignFirstResponder];
    return NO;
  

  }

  return YES;
  }

// 文本视图已经开始编辑

• (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
  NSLog(@"-----------");

  return YES;
  }