Question

我想在它上面展开tableview单元格。在我的tableview中，两个或多个单元格是可扩展的。但我想制作，当我点击可扩展单元格时，它应该显示它下面的单元格并再次点击它应该隐藏。这意味着点击一个单元格，单元格应该只扩展另一个单元格应该是折叠

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>{

    UITableView *mTableView;
    NSMutableArray *sectionTitleArray;
    NSMutableDictionary *sectionContentDict;
    NSMutableArray      *arrayForBool;
    NSInteger previousSelectedIndex;

}


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    mTableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];
    mTableView.delegate = self;
    mTableView.dataSource = self;
    mTableView.rowHeight = 70;
    [self.view addSubview:mTableView];


    if (!sectionTitleArray) {
        sectionTitleArray = [NSMutableArray arrayWithObjects:@"Aachen", @"Berlin", @"Düren", @"Essen", @"Münster", nil];
    }
    if (!arrayForBool) {
        arrayForBool    = [NSMutableArray arrayWithObjects:[NSNumber numberWithBool:NO],
                           [NSNumber numberWithBool:NO],
                           [NSNumber numberWithBool:NO],
                           [NSNumber numberWithBool:NO],
                           [NSNumber numberWithBool:NO] , nil];
    }
    if (!sectionContentDict) {
        sectionContentDict  = [[NSMutableDictionary alloc] init];
        NSArray *array1     = [NSArray arrayWithObjects:@"bla 1", @"bla 2", @"bla 3", @"bla 4", nil];
        [sectionContentDict setValue:array1 forKey:[sectionTitleArray objectAtIndex:0]];
        NSArray *array2     = [NSArray arrayWithObjects:@"wurst 1", @"käse 2", @"keks 3", nil];
        [sectionContentDict setValue:array2 forKey:[sectionTitleArray objectAtIndex:1]];
        NSArray *array3     = [NSArray arrayWithObjects:@"banane", @"auto2", @"haus", @"eidechse", nil];
        [sectionContentDict setValue:array3 forKey:[sectionTitleArray objectAtIndex:2]];
        NSArray *array4     = [NSArray arrayWithObjects:@"hoden", @"pute", @"eimer", @"wichtel", @"karl", @"dreirad", nil];
        [sectionContentDict setValue:array4 forKey:[sectionTitleArray objectAtIndex:3]];
        NSArray *array5     = [NSArray arrayWithObjects:@"Ei", @"kanone", nil];
        [sectionContentDict setValue:array5 forKey:[sectionTitleArray objectAtIndex:4]];
    }
    // Do any additional setup after loading the view, typically from a nib.
}
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return [sectionTitleArray count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if ([[arrayForBool objectAtIndex:section] boolValue]) {
        return [[sectionContentDict valueForKey:[sectionTitleArray objectAtIndex:section]] count];
    }
    return 1;
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    UIView *headerView              = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 50)];
    headerView.tag                  = section;
    headerView.backgroundColor      = [UIColor whiteColor];
    UILabel *headerString           = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, self.view.frame.size.width-20-50, 50)];
    BOOL manyCells                  = [[arrayForBool objectAtIndex:section] boolValue];
    if (!manyCells) {
        headerString.text = @"click to enlarge";
    }else{
        headerString.text = @"click again to reduce";
    }
    headerString.textAlignment      = NSTextAlignmentLeft;
    headerString.textColor          = [UIColor blackColor];
    [headerView addSubview:headerString];

    UITapGestureRecognizer  *headerTapped   = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sectionHeaderTapped:)];
    [headerView addGestureRecognizer:headerTapped];

    //up or down arrow depending on the bool
    UIImageView *upDownArrow        = [[UIImageView alloc] initWithImage:manyCells ? [UIImage imageNamed:@"upArrowBlack"] : [UIImage imageNamed:@"downArrowBlack"]];
    upDownArrow.autoresizingMask    = UIViewAutoresizingFlexibleLeftMargin;
    upDownArrow.frame               = CGRectMake(self.view.frame.size.width-40, 10, 30, 30);
    [headerView addSubview:upDownArrow];

    return headerView;
}
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
    UIView *footer  = [[UIView alloc] initWithFrame:CGRectZero];
    return footer;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    return 50;
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
    return 1;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    if ([[arrayForBool objectAtIndex:indexPath.section] boolValue]) {
        return 50;
    }
    return 1;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
    }
    BOOL manyCells  = [[arrayForBool objectAtIndex:indexPath.section] boolValue];
    if (!manyCells) {
        cell.textLabel.text = @"click to enlarge";
    }
    else{
        NSArray *content = [sectionContentDict valueForKey:[sectionTitleArray objectAtIndex:indexPath.section]];
        cell.textLabel.text = [content objectAtIndex:indexPath.row];
    }


    return cell;
}

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

}
#pragma mark - gesture tapped
- (void)sectionHeaderTapped:(UITapGestureRecognizer *)gestureRecognizer{
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:gestureRecognizer.view.tag];


    if (indexPath.row == 0) {
        BOOL collapsed  = [[arrayForBool objectAtIndex:indexPath.section] boolValue];
        collapsed       = !collapsed;
        [arrayForBool replaceObjectAtIndex:indexPath.section withObject:[NSNumber numberWithBool:collapsed]];

        //reload specific section animated

        NSRange range   = NSMakeRange(indexPath.section, 1);
        NSIndexSet *sectionToReload = [NSIndexSet indexSetWithIndexesInRange:range];
        [mTableView reloadSections:sectionToReload withRowAnimation:UITableViewRowAnimationFade];
    }
    previousSelectedIndex = indexPath.section;

}

请帮助我，我出错的地方

Answer 1

首先，我假设您希望一次只展开一个部分，并在打开时关闭其他标题。如果我的理解正确，请更新您的问题。

在您的代码中，您只是将arrayForBool中的值设置为1，以便扩展该部分。先前扩展的部分怎么样？您需要将其设置为0.

您没有代码可以折叠之前展开的部分。请尝试下面的代码，让我知道它是否有效：

- (void)sectionHeaderTapped:(UITapGestureRecognizer *)gestureRecognizer{
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:gestureRecognizer.view.tag];

    [mTableView beginUpdates];
    if (indexPath.row == 0) {
        BOOL collapsed  = [[arrayForBool objectAtIndex:indexPath.section] boolValue];
        collapsed       = !collapsed;
        [arrayForBool replaceObjectAtIndex:indexPath.section withObject:[NSNumber numberWithBool:collapsed]];
        if (previousSelectedIndex != indexPath.section)
        {
            [mTableView reloadSections:[NSIndexSet indexSetWithIndex:previousSelectedIndex] withRowAnimation:UITableViewRowAnimationFade];
            [arrayForBool replaceObjectAtIndex:previousSelectedIndex withObject:[NSNumber numberWithBool:0]];
        }

        //reload specific section animated

        NSRange range   = NSMakeRange(indexPath.section, 1);
        NSIndexSet *sectionToReload = [NSIndexSet indexSetWithIndexesInRange:range];
        [mTableView reloadSections:sectionToReload withRowAnimation:UITableViewRowAnimationFade];
    }
    previousSelectedIndex = indexPath.section;
    [mTableView endUpdates];

}

希望这有帮助。

目前我的应用程序在点击时打开多个单元格，我怎么能一次只扩展“一个”单元格？

1 个答案: