自定义UITableView折叠效果

类似于QQ的那种折叠效果。只刷新点击的折叠行。不加载所有数据源。 
 测试环境Xcode4.3.3+SDK5.1兼容ios6 
 目测管用

//
//  MyTableViewController.m
//  TableSectionStatistics
//
//  Created by rlf on 12-11-23.
//  Copyright (c) 2012年 __rlf__. All rights reserved.
//
 
#import "MyTableViewController.h"
#define originalHeight 25.0f
#define newHeight 85.0f
#define isOpen @"85.0f"
 
@interface MyTableViewController ()
 
@end
 
@implementation MyTableViewController
{
    NSMutableDictionary *dicClicked;
    NSInteger count;
    CGFloat mHeight;
    NSInteger sectionIndex;
}
 
- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    count = 0;
    mHeight = originalHeight;
    sectionIndex = 0;
    dicClicked = [NSMutableDictionary dictionaryWithCapacity:3];
}
 
- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}
 
#pragma mark - Table view data source
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 50;
}
 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 2;
}
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{   
    static NSString *contentIndentifer = @"Container";
    if (indexPath.row == 0) {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:contentIndentifer];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:contentIndentifer];
        }
        NSString *statisticsContent = [[NSString alloc] initWithString:@"rlf:岁月流芳，花开几度，走在岁月里，醉在流香里，总在时光里辗转徘徊。花开几许，落花几度，岁月寒香，飘进谁的诗行，一抹幽香，掺入几许愁伤，流年似花，春来秋往，睁开迷离的双眼，回首张望，随风的尘烟荡漾着迷忙，昨日的光阴已逝去，留下无尽的回忆让人留恋与追忆"];
        cell.textLabel.font = [UIFont systemFontOfSize:12.0f];
        cell.textLabel.text = statisticsContent;
        cell.textLabel.textColor = [UIColor brownColor]
        ;
        cell.textLabel.opaque = NO; // 选中Opaque表示视图后面的任何内容都不应该绘制       
        cell.textLabel.numberOfLines = 8;       
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        return cell;
    }
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.imageView.image = [UIImage imageNamed:@"ic_milestone_heart.png"];
    cell.textLabel.text = [NSString stringWithFormat:@"%d",count];
    count++;
    return cell;
}
 
//Section的标题栏高度
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    if (section == 0)
        return 46;
    else
        return 30.0f;
}
 
 
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    CGRect headerFrame = CGRectMake(0, 0, 300, 30);
    CGFloat y = 2;
    if (section == 0) {
        headerFrame = CGRectMake(0, 0, 300, 100);
        y = 18;
    }
    UIView *headerView = [[UIView alloc] initWithFrame:headerFrame];
    UILabel *dateLabel=[[UILabel alloc] initWithFrame:CGRectMake(20, y, 240, 24)];//日期标签
    dateLabel.font=[UIFont boldSystemFontOfSize:16.0f];
    dateLabel.textColor = [UIColor darkGrayColor];
    dateLabel.backgroundColor=[UIColor clearColor];
    UILabel *ageLabel=[[UILabel alloc] initWithFrame:CGRectMake(216, y, 88, 24)];//年龄标签
    ageLabel.font=[UIFont systemFontOfSize:14.0];
    ageLabel.textAlignment=UITextAlignmentRight;
    ageLabel.textColor = [UIColor darkGrayColor];
    ageLabel.backgroundColor=[UIColor clearColor];
     
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"MM dd,yyyy";
    dateLabel.text = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:[NSDate date]]];
    ageLabel.text = @"1岁 2天";
     
    [headerView addSubview:dateLabel];
    [headerView addSubview:ageLabel];
    return headerView;
}
 
#pragma mark - Table view delegate
 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == 0) {  
        UITableViewCell *targetCell = [tableView cellForRowAtIndexPath:indexPath];
        if (targetCell.frame.size.height == originalHeight+1){         
            [dicClicked setObject:isOpen forKey:indexPath];
        }
        else{    
            [dicClicked removeObjectForKey:indexPath];
        }      
      [self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
    NSLog(@"indexPath=%@",indexPath);
    NSLog(@"dicClicked=%@",dicClicked);
}
 
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == 0) {
        if ([[dicClicked objectForKey:indexPath] isEqualToString: isOpen])
            return [[dicClicked objectForKey:indexPath] floatValue];
        else
            return originalHeight;    
    }
    else {
        return 45.0f;
    }
}
 
@end