Question

Here in this image the first section is not expanded whereas second section expands on click.

扩展的单元格也应该在didselect上转到viewcontroller 所有部分的行中的数据都是静态的。我怎样才能在目标c？中实现这一点？我试着寻找这个问题但却找不到。

Answer 1

使用以下代码将可扩展单元格拖放到UITableView：

- (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] autorelease];
    }
    cell.textLabel.text=[[self.arForTable objectAtIndex:indexPath.row] valueForKey:@"name"];
    [cell setIndentationLevel:[[[self.arForTable objectAtIndex:indexPath.row] valueForKey:@"level"] intValue]];    
    return cell;
}

扩展代码＆amp;折叠行将进入TableView的DidSelectRow方法：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSDictionary *d=[self.arForTable objectAtIndex:indexPath.row];
    if([d valueForKey:@"Objects"]) {
        NSArray *ar=[d valueForKey:@"Objects"];
        BOOL isAlreadyInserted=NO;
        for(NSDictionary *dInner in ar ){
            NSInteger index=[self.arForTable indexOfObjectIdenticalTo:dInner];
            isAlreadyInserted=(index>0 && index!=NSIntegerMax);
            if(isAlreadyInserted) break; 
        }
        if(isAlreadyInserted) {
            [self miniMizeThisRows:ar];
        } else {        
            NSUInteger count=indexPath.row+1;
            NSMutableArray *arCells=[NSMutableArray array];
            for(NSDictionary *dInner in ar ) {
                [arCells addObject:[NSIndexPath indexPathForRow:count inSection:0]];
                [self.arForTable insertObject:dInner atIndex:count++];
            }
            [tableView insertRowsAtIndexPaths:arCells withRowAnimation:UITableViewRowAnimationLeft];
        }
    }
}

最后，一种帮助最小化 - 最大化/扩展 - 折叠行的方法：

-(void)miniMizeThisRows:(NSArray*)ar{
    for(NSDictionary *dInner in ar ) {
        NSUInteger indexToRemove=[self.arForTable indexOfObjectIdenticalTo:dInner];        
        NSArray *arInner=[dInner valueForKey:@"Objects"];
        if(arInner && [arInner count]>0){
            [self miniMizeThisRows:arInner];
        }
        if([self.arForTable indexOfObjectIdenticalTo:dInner]!=NSNotFound) {
            [self.arForTable removeObjectIdenticalTo:dInner];
            [self.tableView deleteRowsAtIndexPaths:
              [NSArray arrayWithObject:[NSIndexPath indexPathForRow:indexToRemove inSection:0]]
                      withRowAnimation:UITableViewRowAnimationRight];
        }
    }
}

Download code from here

Answer 2

首先我为每个静态单元格创建了属性，在viewDidLoad中我将它们设置为隐藏：

- (void)viewDidLoad
{
 [super viewDidLoad];
 isExpanded = NO;
 self.cell2.hidden = YES;
 self.cell3.hidden = YES;
 self.cell4.hidden = YES;
}

然后在DidSelectRowAtIndex：

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([indexPath section]== 1 && [indexPath row]==0)
{
    new1 =[NSIndexPath indexPathForRow:indexPath.row+1 inSection:indexPath.section];
    new2 =[NSIndexPath indexPathForRow:indexPath.row+2 inSection:indexPath.section];
    new3 =[NSIndexPath indexPathForRow:indexPath.row+3 inSection:indexPath.section];
    self.cell2 = [super tableView:tableView cellForRowAtIndexPath:new1];
    self.cell3 = [super tableView:tableView cellForRowAtIndexPath:new2];
    self.cell4 = [super tableView:tableView cellForRowAtIndexPath:new3];
    CATransition *animate = [CATransition animation];
    animate.type = kCATransitionMoveIn;
    animate.duration = 0.4;

    [self.cell2.layer addAnimation:animate forKey:nil];
    [self.cell3.layer addAnimation:animate forKey:nil];
    [self.cell4.layer addAnimation:animate forKey:nil];

    if (isExpanded == NO)
    {
        self.cell4.hidden = NO;
        self.cell2.hidden = NO;
        self.cell3.hidden = NO;
        isExpanded = YES;        }
    else
    {
        isExpanded = NO;
        self.cell4.hidden = YES;
        self.cell2.hidden = YES;
        self.cell3.hidden = YES;

    }
}
}

我不确定它有多好......如果有任何错误，请告诉我，因为我对目标c很新。

如何创建可扩展的表视图单元？当我点击一个单元格时，它应该展开并显示它包含的子单元格

2 个答案: