TableView下拉cell

效果如下：

源码如下：

//
//  MainViewController.m
//  NodeTableView
//
//  Created by ChenJungang on 14/11/10.
//  Copyright (c) 2014年 ChenJungang. All rights reserved.
//

#import "MainViewController.h"
#import "MainCell.h"

#define MAX_Count 55535


@interface MainViewController ()<UITableViewDataSource,UITableViewDelegate>

@property (strong, nonatomic) UITableView   *tableView;
@property (strong, nonatomic) NSArray       *dataArray;
@property (assign, nonatomic) NSInteger     rowCount;
@property (assign, nonatomic) NSInteger     sectionCount;

@end

@implementation MainViewController

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        self.rowCount = 0;
        self.sectionCount = MAX_Count;
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"node tableView";
    [self.view addSubview:self.tableView];
}
-(NSArray*)dataArray {
    if (!_dataArray) {
        self.dataArray = @[@{@"array": @[@{@"name":@"11", @"position":@"position1"},
                                         @{@"name":@"12", @"position":@"position2"},
                                         @{@"name":@"13", @"position":@"position3"},
                                         @{@"name":@"14", @"position":@"position4"},
                                         @{@"name":@"15", @"position":@"position5"}],@"name":@"one", @"position":@"position—one"},
                           @{@"array": @[@{@"name":@"21", @"position":@"position1"},
                                         @{@"name":@"22", @"position":@"position2"},
                                         @{@"name":@"23", @"position":@"position3"},
                                         @{@"name":@"24", @"position":@"position4"},
                                         @{@"name":@"25", @"position":@"position5"}],@"name":@"two", @"position":@"position—two"},
                           @{@"array": @[@{@"name":@"31", @"position":@"position1"},
                                         @{@"name":@"32", @"position":@"position2"},
                                         @{@"name":@"33", @"position":@"position3"},
                                         @{@"name":@"34", @"position":@"position4"},
                                         @{@"name":@"35", @"position":@"position5"}],@"name":@"three", @"position":@"position—three"},
                           @{@"array": @[@{@"name":@"41", @"position":@"position1"},
                                         @{@"name":@"42", @"position":@"position2"},
                                         @{@"name":@"43", @"position":@"position3"},
                                         @{@"name":@"44", @"position":@"position4"},
                                         @{@"name":@"45", @"position":@"position5"}],@"name":@"four", @"position":@"position—four"},
                           @{@"array": @[@{@"name":@"51", @"position":@"position1"},
                                         @{@"name":@"52", @"position":@"position2"},
                                         @{@"name":@"53", @"position":@"position3"},
                                         @{@"name":@"54", @"position":@"position4"},
                                         @{@"name":@"55", @"position":@"position5"}],@"name":@"five", @"position":@"position—five"}];
    }
    return _dataArray;
}
- (UITableView *)tableView{
    if (!_tableView) {
        CGRect rect = self.view.bounds;
        rect.origin.y = 0;
        rect.size.height = rect.size.height - rect.origin.y;
        _tableView = [[UITableView alloc]initWithFrame:rect style:UITableViewStylePlain];
        _tableView.delegate = self;
        _tableView.dataSource = self;
        _tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
    }
    return _tableView;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return self.dataArray.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if (_sectionCount != MAX_Count) {
        if (section == _sectionCount) {
            return 1 + _rowCount;
        }
        return 1;
    }else{
        return 1;
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *CellId = @"CellId";
    MainCell *cell = [tableView dequeueReusableCellWithIdentifier:CellId];
    if (!cell) {
        cell = [MainCell loadFromXib];
    }
    if (indexPath.row == 0) {
        cell.nameLabel.text = self.dataArray[indexPath.section][@"name"];
        cell.positionLabel.text = self.dataArray[indexPath.section][@"position"];
    }else{
        cell.nameLabel.text = self.dataArray[indexPath.section][@"array"][indexPath.row-1][@"name"];
        cell.positionLabel.text = self.dataArray[indexPath.section][@"array"][indexPath.row-1][@"position"];
    }
    return cell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView beginUpdates];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSUInteger number =[self.dataArray[indexPath.section][@"array"]  count];
    if (indexPath.row == 0) {
        if(_sectionCount == MAX_Count){
            _sectionCount = indexPath.section;
            [self addCellwithNumber:number];
        }else if (_sectionCount == indexPath.section) {
            [self removeCellwithNumber:number];
            _sectionCount = MAX_Count;
        }else{
            [self removeCellwithNumber:number];
            _sectionCount = indexPath.section;
            [self addCellwithNumber:number];
        }
    }
    [tableView endUpdates];
}

-(void)removeCellwithNumber:(NSInteger)number
{
    for (int i=(int)number; i>=1; i--) {
        --_rowCount;
        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:i inSection:_sectionCount]]
                              withRowAnimation:UITableViewRowAnimationTop];
    }
    
}
-(void)addCellwithNumber:(NSInteger)number
{
    for (int i=1; i<=number; i++) {
        ++_rowCount;
        [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:i inSection:_sectionCount]]
                              withRowAnimation:UITableViewRowAnimationTop];
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

核心代码：