iOS实现列表折叠效果

本文实例为大家分享了ios实现列表折叠效果的具体代码，供大家参考，具体内容如下

实现列表折叠效果其实比较简单，点击列表头部的时候，把返回列表行数设为 0，就是收起列表；再次点击列表头部，显示列表的行数，就展开了列表。

#import "tabledownupvc.h"
#import "tableviewcell_tableselect.h"

@interface tabledownupvc ()
{
 nsmutabledictionary *dicselet;
 nsarray *arrdata;
 nsmutablearray *arrstatus;
 nsinteger selectflag;

 nsmutabledictionary *dictshow;
}

@property (nonatomic, strong) uiimageview *imgarror;

@end

@implementation tabledownupvc

- (void)viewdidload {
 [super viewdidload];
 self.tableview.autoresizingmask = uiviewautoresizingflexibleheight;
 self.title = @"列表折叠效果";

 dictshow = [[nsmutabledictionary alloc] init];
 arrstatus = [[nsmutablearray alloc] init];

 nsdictionary *dict0 = @{@"section":@"头部0",
       @"content":@[@{@"title":@"section0",@"subtitle":@"row0",@"avator":@"user_default_blue"},
           @{@"title":@"section0",@"subtitle":@"row1",@"avator":@"user_default_blue"},
           @{@"title":@"section0",@"subtitle":@"row2",@"avator":@"user_default_blue"}]};

 nsdictionary *dict1 = @{@"section":@"头部1",
       @"content":@[@{@"title":@"section1",@"subtitle":@"row0",@"avator":@"user_default_blue"},
           @{@"title":@"section1",@"subtitle":@"row1",@"avator":@"user_default_blue"},
           @{@"title":@"section1",@"subtitle":@"row2",@"avator":@"user_default_blue"}]};

 nsdictionary *dict2 = @{@"section":@"头部2",
       @"content":@[@{@"title":@"section2",@"subtitle":@"row0",@"avator":@"user_default_blue"},
           @{@"title":@"section2",@"subtitle":@"row1",@"avator":@"user_default_blue"},
           @{@"title":@"section2",@"subtitle":@"row2",@"avator":@"user_default_blue"}]};

 arrdata = @[dict0,dict1,dict2];

 dicselet = [[nsmutabledictionary alloc] init];

 //初始化选中状态(默认都不选择)
 for (nsinteger i=0; i<arrdata.count; i++) {
  nsarray *content = arrdata[i][@"content"];
  nsmutabledictionary *dict = [[nsmutabledictionary alloc] init];
  for (nsinteger j=0; j<content.count; j++) {
   [dict setobject:@"0" forkey:str_num(j)];
  }
  [arrstatus addobject:dict];
 }

 //初始化列表头部折叠状态
 for (nsinteger i=0; i<arrdata.count; i++) {
  [dictshow setobject:@"0" forkey:str_num(i)];
 }
}

#pragma mark - tableviewdatasource,uitableviewdelegate 扩展

- (nsinteger)numberofsectionsintableview:(uitableview *)tableview
{
 return arrdata.count;
}

- (nsinteger)tableviewex:(uitableview *)tableview numberofrowsinsection:(nsinteger)section
{
 nsstring *isshow = dictshow[str_num(section)];
 if ([isshow isequaltostring:@"0"]) {
  nsarray *arr = arrdata[section][@"content"];
  return arr.count;
 } else {
  return 0;
 }
}

- (cgfloat)tableviewex:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath
{
 return 60;
}

- (uitableviewcell *)tableviewex:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath
{
 static nsstring * identifier = @"cellidentifier";
 tableviewcell_tableselect *cell = [tableview dequeuereusablecellwithidentifier:identifier];
 cell.selectionstyle = uitableviewcellselectionstylenone;
 if (cell == nil) {
  cell = [[tableviewcell_tableselect alloc]initwithstyle:uitableviewcellstylesubtitle reuseidentifier:identifier];
 }
 [cell setdictinfo:arrdata[indexpath.section][@"content"][indexpath.row]];
 [cell setaccessoryimage:arrstatus[indexpath.section][str_num(indexpath.row)]];

 return cell;
}

- (void)tableviewex:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath
{
 nsmutabledictionary *dict = arrstatus[indexpath.section];
 nsstring *str = dict[str_num(indexpath.row)];
 if ([str isequaltostring:@"0"]) {
  [dict setvalue:@"1" forkey:str_num(indexpath.row)];
 } else {
  [dict setvalue:@"0" forkey:str_num(indexpath.row)];
 }
 [self.tableview reloaddata];
}

- (cgfloat)tableview:(uitableview *)tableview heightforheaderinsection:(nsinteger)section
{
 return 50;
}

- (cgfloat)tableview:(uitableview *)tableview heightforfooterinsection:(nsinteger)section
{
 return 10;
}

- (uiview *)tableview:(uitableview *)tableview viewforheaderinsection:(nsinteger)section
{

 uiview *headerview = [uicommonctrl commonviewwithframe:cgrectmake(0, 0, screen_width, 50) color:kcolor_white];

 uilabel *title = [uicommonctrl commonlabelwithframe:cgrectmake(10, 15, 200, 20)
             text:arrdata[section][@"section"]
             color:kcolor_black
             font:kfont_large
           textalignment:nstextalignmentleft];
 [headerview addsubview:title];

 _imgarror = [uicommonctrl commonimageviewwithframe:cgrectmake(screen_width-20, 22.5, 10, 5) image:nil];
 [headerview addsubview:_imgarror];

 nsstring *str = [dictshow objectforkey:str_num(section)];
 if ([str isequaltostring:@"0"]) {
  _imgarror.image = [uiimage imagenamed:@"icon_down"];
 } else {
  _imgarror.image = [uiimage imagenamed:@"icon_up"];
 }

 @weakify(self)
 uibutton *btn = [uicommonctrl commonbuttonwithframe:cgrectmake(0, 0, screen_width, 50)
             text:@""
             color:kcolor_black
             font:kfont_large
          backgroundimage:nil
             block:^(uibutton *btn) {
              @strongify(self)
              nsstring *str = [dictshow objectforkey:str_num(section)];
              if ([str isequaltostring:@"0"]) {
               [dictshow setvalue:@"1" forkey:str_num(section)];
              } else {
               [dictshow setvalue:@"0" forkey:str_num(section)];
              }
              [self refreshsection:section];

             }];
 [headerview addsubview:btn];


 for (nsinteger i=0; i<2; i++) {
  uiview *line = [uicommonctrl commonlineviewwithframe:cgrectmake(0, (50-line_size)*i, screen_width, line_size) color:kcolor_line];
  [headerview addsubview:line];
 }

 return headerview;
}

- (uiview *)tableview:(uitableview *)tableview viewforfooterinsection:(nsinteger)section
{
 uiview *footerview = [uicommonctrl commonviewwithframe:cgrectmake(0, 0, screen_width, 10) color:kcolor_background];
 return footerview;
}

- (void)refreshsection:(nsinteger)section
{
 nsindexset *indexset=[[nsindexset alloc]initwithindex:section];
 [self.tableview reloadsections:indexset withrowanimation:uitableviewrowanimationfade];
}

@end

效果图

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