如何在表格中插入行? [英] How can I insert row in a table?

问题描述

我是Objective-c的新手.我有一个3行1节的tableView.您能帮我如何通过按下按钮(addCity)在表中添加带有某些文本的行吗?

I'm new in objective-c. I have a tableView with 3 rows and 1 section. Can you help me how to add row with some text in a table by pressing button (addCity)?

- (void)viewDidLoad {
    [super viewDidLoad];
    m_bg.image = [UIImage imageNamed:[WeatherAppDelegate isNight]  ? @"SettingsBackNight.png" : @"SettingsBackDay.png" ];
    tableView.layer.cornerRadius = 10;
    m_scrollView.layer.cornerRadius = 10;
    [m_scrollView setContentSize:CGSizeMake(tableView.frame.size.width, tableView.frame.size.height)];
    dataArray = [[NSMutableArray alloc] initWithObjects:@"Moscow", @"London", @"Paris", nil];

}


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [dataArray count];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *MyIdentifier = @"MyIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease];
    }

    [cell.textLabel setText: [dataArray objectAtIndex:indexPath.row]];
    return cell;
}


-(IBAction)addCity:(id)sender
{
    [dataArray addObject:@"City"];
    NSArray *paths = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:[dataArray count]-1 inSection:1]];
    [[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationTop];
    [tableView reloadData];
}

推荐答案

您的表必须从某些源中获取其数据，您可以在需要时在其中添加元素. (例如，数据源中的NSMutableArray实例)，则您的方法将如下所示.为简单起见，假设您有包含NSStrings的dataArray:

Your table must take its data from some source where you can add elements when needed. (say, NSMutableArray instance in your data source), then your methods will look like. For simplicity assume that you have dataArray containing NSStrings:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
   return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
   return [dataArray count];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *MyIdentifier = @"MyIdentifier";
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
  if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease];
  }
  [cell.textLabel setText: [dataArray objectAtIndex:indexPath.row];
  return cell;
}


-(IBAction)addCity:(id)sender
{
  [tableView beginUpdates];
  [dataArray addObject:@"City"];
  NSArray *paths = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:[dataArray count]-1 inSection:1]];
  [[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationTop];
  [tableView endUpdates];
}

这篇关于如何在表格中插入行?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！