ios 在 tableView 中获取部分 indexPath 的行

Getting the Row for Section indexPath in a tableView

提问by Jared Gross

Recently I put implemented an indexing feature for the user names in my app. I have been trying to access the rows in each section and add them to my recipients array when the user taps the index path. I have tried passing many different values in my objectAtIndex: method but none seem to be working. I am able to log the correct index row and section in indexPathForRow:inSection: method but the return value is an indexPath and not an integer. So something with my objectForIndex: method is obviously not right. Any help or references would be super. cheers!

最近我在我的应用程序中为用户名实现了索引功能。我一直在尝试访问每个部分中的行，并在用户点击索引路径时将它们添加到我的收件人数组中。我尝试在 objectAtIndex: 方法中传递许多不同的值，但似乎都没有工作。我能够在 indexPathForRow:inSection: 方法中记录正确的索引行和部分，但返回值是 indexPath 而不是整数。所以我的 objectForIndex: 方法显然是不对的。任何帮助或参考都是超级的。干杯！

This line:

这一行：

PFUser *user = [self.friends objectAtIndex:indexPath.section];

PFUser *user = [self.friends objectAtIndex:indexPath.section];

Returns only the first username in each section, no matter what name I tap in the section. So I need to access the Row in addition, not just the section.

只返回每个部分中的第一个用户名，无论我在该部分中点击什么名称。所以我需要另外访问 Row，而不仅仅是该部分。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];

UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

int section = indexPath.section;
int row = indexPath.row;
NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:row inSection:section];
NSLog(@"newIndexPath: %@", newIndexPath);

PFUser *user = [self.friends objectAtIndex:indexPath.section];

if (cell.accessoryType == UITableViewCellAccessoryNone) {
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
    [self.recipients addObject:user.objectId];
NSLog(@"added:%@",user);
}
else {
    cell.accessoryType = UITableViewCellAccessoryNone;
    [self.recipients removeObject:user.objectId];
    NSLog(@"removed:%@",user);
}

[self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
    if (error) {
        NSLog(@"Error %@ %@", error, [error userInfo]);
    }
}];
}

采纳答案by Arun

Hi this is enough try and let me know if you face any issues...

嗨，这已经足够了，如果您遇到任何问题，请告诉我...

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{

[self.tableView deselectRowAtIndexPath:indexPath animated:NO];

NSArray * nameArray = [self.sectionsArray objectAtIndex:indexPath.section];

PFUser *user = (PFUser*)[nameArray objectAtIndex:indexPath.row];

// PFUser *user = (PFUser*)[self.friends objectAtIndex:indexPath.section];

if (cell.accessoryType == UITableViewCellAccessoryNone) 
{
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
    [self.recipients addObject:user.objectId];
NSLog(@"added:%@",user);
}
else {
    cell.accessoryType = UITableViewCellAccessoryNone;
    [self.recipients removeObject:user.objectId];
    NSLog(@"removed:%@",user);
}
// this is enough
}

回答by Jared Gross

Just like the code Spynet suggested only a little bit different:

就像 Spynet 建议的代码只有一点不同：

NSArray *array = [self.sectionsArray objectAtIndex:indexPath.section];
    PFUser *user = [array objectAtIndex:indexPath.row];

Using that code I was able to get the proper indexPath for row in each section. Also, in order to get the cells accessory checkmarks to work correctly I had to create a newIndexPath using the section and row values for each index. My final code is here:

使用该代码，我能够为每个部分中的行获取正确的 indexPath。此外，为了使单元格附件复选标记正常工作，我必须使用每个索引的节和行值创建一个 newIndexPath。我的最终代码在这里：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    int row = indexPath.row;
    int section = indexPath.section;

    NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:row inSection:section];
    NSLog(@"newIndexPath: %@", newIndexPath);

    [self.tableView deselectRowAtIndexPath:newIndexPath animated:NO];

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:newIndexPath];

    NSLog(@"sectionsArray:%@",self.sectionsArray);

    NSArray *array = [self.sectionsArray objectAtIndex:indexPath.section];
    PFUser *user = [array objectAtIndex:indexPath.row];
    NSLog(@"array:%@",array);
    NSLog(@"user:%@",user);

    if (cell.accessoryType == UITableViewCellAccessoryNone) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
        [self.recipients addObject:user];
        NSLog(@"recipients:%@",self.recipients);
    }
    else {
        cell.accessoryType = UITableViewCellAccessoryNone;
        [self.recipients removeObject:user];
        NSLog(@"recipients:%@",self.recipients);
    }

    [self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (error) {
            NSLog(@"Error %@ %@", error, [error userInfo]);
        }
    }];
}