#iOS分级展开

按数据进行展开，最多二级（三级目录）。

自适应展开的情况，可能是一层目录（不展开）二级目录（展开一级）三级目录展开两级

写作原因：
1.最近做的一个需求，感觉不错。
2.git上没发现，大多数是一级展开，像qq那样，没发现二级展开的代码
可以得到的东西：自适应展开，二级目录的一级展开，三级目录的二级展开

思路：最难的无非是三级的情况，此时我们第一级用tableView的headerView自定义作为第一级，点击展开的tableView作为第二级数据显示，点击tableview的每一行，我们在cell里面用tableview作为他的第三级进行显示。 其它的如果是二级的话，tableview的headerView作为第一级，点击展开的tableview作为第二级。 如果是一级的情况，只需要把tableview的header作为第二级。

1.首先建立tableView，不在赘述，但tableview得类型要用UITableViewStyleGrouped

2.第二处理数据源，将其处理成模型，放在数组中，不在赘述

3.tableView的代理

#promark -- UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    
    return _endArray.count;
    
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    
    ParentModel *pmodel = _endArray[section];
    if (pmodel.unfold) {
        return pmodel.children.count;
    }
    return 0;
    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    ParentModel *pmodel = _endArray[indexPath.section];
    ParentModel *cmodel = pmodel.children[indexPath.row];
    if ([cmodel.type isEqualToString:@"unit"]) {
        TEFoldTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:foldCellIdentifier];
        if (!cell) {
            cell = [[[NSBundle mainBundle]loadNibNamed:foldCellIdentifier owner:self options:nil]lastObject];
        }
        if (indexPath.row == 0 && cmodel.unfold) {
            cell.lineView.backgroundColor = [UIColor colorFromHexRGB:@"0xdddddd"];
        }
        [cell cellConfigureCellFromModel:cmodel];
        cell.delegate = self;
        return cell;
    }
    CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:customTableViewCellIdentifier];
    if (!cell) {
        cell = [[[NSBundle mainBundle]loadNibNamed:customTableViewCellIdentifier owner:self options:nil]lastObject];
    }
    
    [cell cellConfigureContentFromModel:cmodel];
    return cell;
    
}

#pragma mark -- UITableViewDelegate

-(CGFloat)tableView:(UITableView*)tableView heightForFooterInSection:(NSInteger)section
{
    
    return 0.01f;
    
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    ParentModel *testModel = _endArray[indexPath.section];
    ParentModel *childModel = testModel.children[indexPath.row];
    if (childModel.unfold && [childModel.type isEqualToString:@"unit"]) {
        return childModel.children.count * 62 + 45;
    }
    if ([childModel.type isEqualToString:@"lesson"]) {
        return 62;
    }
    return 45;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
    ParentModel *testModel = _endArray[indexPath.section];
    ParentModel *childModel = testModel.children[indexPath.row];
    childModel.unfold = !childModel.unfold;
    
    [tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
//    [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
    [tableView deselectRowAtIndexPath:indexPath animated:true];
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    
    ParentModel *pmodel = _endArray[section];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    
    button.tag = section + 1;
    [button setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(buttonPress:) forControlEvents:UIControlEventTouchUpInside];
    
    
    if ([pmodel.type isEqualToString:@"lesson"]) {
        button.frame = CGRectMake(0, 0, self.view.frame.size.width, 62);
        
        UIImageView *leftImageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 17, 17)];
        UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(CGRectGetMaxX(leftImageView.frame) + 10, 10, CGRectGetWidth(self.view.frame) - CGRectGetMaxX(leftImageView.frame) - 10, 20)];
        titleLabel.font = [UIFont systemFontOfSize:14];
        titleLabel.textAlignment = NSTextAlignmentLeft;
        titleLabel.textColor = [UIColor colorFromHexRGB:@"0x666666"];
        titleLabel.text = pmodel.name;
        
        [button addSubview:titleLabel];
        
        UILabel *subTitleLable = [[UILabel alloc]initWithFrame:CGRectMake(CGRectGetMinX(titleLabel.frame) + 5, CGRectGetMaxY(titleLabel.frame) + 5, self.view.frame.size.width/4, 15)];
        subTitleLable.font = [UIFont systemFontOfSize:11];
        subTitleLable.textColor = [UIColor colorFromHexRGB:@"0x999999"];
        subTitleLable.text = pmodel.type;
        [button addSubview:subTitleLable];
        
        UILabel *liveStatusLabel = [[UILabel alloc]initWithFrame:CGRectMake(CGRectGetMaxX(subTitleLable.frame) + 8, CGRectGetMinY(subTitleLable.frame), 35, 15)];
        liveStatusLabel.layer.cornerRadius = 7;
        liveStatusLabel.layer.masksToBounds = YES;
        liveStatusLabel.backgroundColor = [UIColor colorFromHexRGB:@"0xe93131"];
        liveStatusLabel.textColor = [UIColor colorFromHexRGB:@"0xfffefe"];
        liveStatusLabel.text = @"直播中";//通过判断时间来判断是否直播中，或已结束
        liveStatusLabel.font = [UIFont systemFontOfSize:11];
        [button addSubview:liveStatusLabel];
        liveStatusLabel.hidden = YES;
        
        switch ([pmodel.lesson_type integerValue]) {
            case 1:
                leftImageView.image = [UIImage imageNamed:@"play-round"];
                subTitleLable.text = [NSString stringWithFormat:@"%@分钟",pmodel.media_length];
                break;
            case 2:
            case 4:
#warning 这里为直播，显示直播时间，还要判断是否在直播中，无数据，有数据需要完善。
                
                leftImageView.image = [UIImage imageNamed:@"zb"];
                NSLog(@"等待处理时间戳转换");
                break;
            case 3:
            case 8:
                leftImageView.image = [UIImage imageNamed:@"cl"];
                subTitleLable.text = @"试卷";
                break;
            case 5:
            case 6:
            case 7:
                leftImageView.image = [UIImage imageNamed:@"tkd"];
                subTitleLable.text = @"材料";
                break;
                
            default:
                break;
        }
        [button addSubview:leftImageView];
        
    } else {
        button.frame = CGRectMake(0, 0, self.view.frame.size.width, 45);
        
        UILabel *tlabel = [[UILabel alloc]initWithFrame:CGRectMake(10, (44-20)/2, 200, 20)];
        [tlabel setBackgroundColor:[UIColor clearColor]];
        [tlabel setFont:[UIFont systemFontOfSize:16]];
        tlabel.textColor = [UIColor colorFromHexRGB:@"0x333333"];
        [tlabel setText:[pmodel.name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]];
        [button addSubview:tlabel];
        
        UIImageView *rightImageVIew = [[UIImageView alloc]initWithFrame:CGRectMake(self.view.frame.size.width - 21,button.frame.size.height / 2 -5 , 11, 11)];
        if ([pmodel.type isEqualToString:@"unit"]) {
            rightImageVIew.frame = CGRectMake(self.view.frame.size.width - 21,button.frame.size.height / 2 -5 , 11, 7);
            if (pmodel.unfold) {
                rightImageVIew.image = [UIImage imageNamed:@"slgx"];
                
            } else {
                rightImageVIew.image = [UIImage imageNamed:@"slgx1"];
                
            }
        }else {
            if (pmodel.unfold) {
                rightImageVIew.image = [UIImage imageNamed:@"xcjq"];
            } else {
                rightImageVIew.image = [UIImage imageNamed:@"xcjq1"];
                
            }
        }
        [button addSubview:rightImageVIew];
    }
    
    UIView *lineView = [[UIView alloc]initWithFrame:CGRectMake(0, CGRectGetHeight(button.frame) - 3, self.view.frame.size.width, 3)];
    if (pmodel.unfold) {
        lineView.frame = CGRectMake(0, CGRectGetHeight(button.frame) - 1, self.view.frame.size.width, 1);
    } else {
        lineView.frame = CGRectMake(0, CGRectGetHeight(button.frame) - 3, self.view.frame.size.width, 3);
    }
    lineView.backgroundColor = [UIColor colorFromHexRGB:@"0xdddddd"];
    
    [button addSubview:lineView];
    
    return  button;
}


- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    ParentModel *model = _endArray[section];
    if ([model.type isEqualToString:@"lesson"]) {
        return 62;
    }
    return 44;
    
}

#headerView的点击方法
- (void)buttonPress:(UIButton *)sender//headButton点击
{
    ParentModel *model = _endArray[sender.tag - 1];
    //判断状态值
    if (![model.type isEqualToString:@"lesson"]) {
        model.unfold = !model.unfold;
        
    }
    [_listTableView reloadSections:[NSIndexSet indexSetWithIndex:sender.tag-1] withRowAnimation:UITableViewRowAnimationAutomatic];
    
}

model的属性

/**自己独一无二的id 不要与包id混乱*/
@property (nonatomic, copy) NSString *courseId;
/**标题*/
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *number;
/**类型 章节*/
@property (nonatomic, copy) NSString *type;
/**课件类型*/
@property (nonatomic, copy) NSString *lesson_type;
@property (nonatomic, copy) NSMutableArray *children;
/**是否打开*/
@property (nonatomic, assign) BOOL unfold;

/**如果是视频视频长度，否则返回直播开始时间*/
@property (nonatomic, copy) NSString *media_length;
/**webView链接*/
@property (nonatomic, copy) NSString *test_paper_link;

TEFoldTableViewCell的实现

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _childArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *ID = @"CustomTableViewCell";
    CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (!cell) {
        cell = [[[NSBundle mainBundle]loadNibNamed:ID owner:self options:nil]lastObject];;
    }
    ParentModel * model = _childArray[indexPath.row];
    [cell cellConfigureContentFromModel:model];
    cell.titleNameLabel.text = [model.name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 62;
    
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    ParentModel *model = _childArray[indexPath.row];
    if ([self.delegate respondsToSelector:@selector(TableViewCellDidSelectWithLessonModel:)]) {
        [self.delegate TableViewCellDidSelectWithLessonModel:model];
    }
    [tableView deselectRowAtIndexPath:indexPath animated:true];
    
}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
        [cell setSeparatorInset:UIEdgeInsetsZero];
    }
    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        [cell setLayoutMargins:UIEdgeInsetsZero];
    }
}

//更换图片
-(void)setArrowImageIfUnfold:(BOOL)unfold {
    
    if (unfold) {
        [self.imageButton setImage:[UIImage imageNamed:@"slgx"] forState:UIControlStateNormal];
        
    } else {
        [self.imageButton setImage:[UIImage imageNamed:@"slgx1"] forState:UIControlStateNormal];

    }

}

- (void)cellConfigureCellFromModel:(ParentModel *)model {
    
    self.nameLabel.text = model.name;
    self.childArray = model.children;
    [self setArrowImageIfUnfold:model.unfold];

}

最底层的CustomTableVIewCell的xib不在讲述

最新代码已经上传到git

如果你觉得有用就加个star吧