Data requested by the iOS development server is re-grouped by date

This is often the case in app development, where data from the backend needs to be grouped according to certain criteria. For example, in my project: The data in the array needs to be grouped by time, data on the same day, such as the data of number 8-20, is divided into groups, and the data of number 8-21 is divided into groups. The code is as follows:

#import "ViewController.h" #import "model.h" @interface Viewcontroller () <uitableviewdelegate,    uitableviewdatasource>{Nsmutablearray *usermodelarr;    Nsmutablearray *temparray;    Nsmutablearray *_datearr;    Nsmutablearray *timearr;    Nsarray * ARRRRRRRRRR; } @property (Nonatomic,strong) UITableView *tableview; @end @implementation viewcontroller-(void) Viewdidload {[Super   Viewdidload];    Self.title = @ "Meeting";    _tableview = [[UITableView alloc] initwithframe:[[uiscreen mainscreen] bounds] style:uitableviewstyleplain];    _tableview.datasource = self;        _tableview.delegate = self;       [Self.view Addsubview:_tableview];        [Self Shuju];        }-(void) shuju{Temparray = [Nsmutablearray array];    Nsurlsession *session = [Nsurlsession sharedsession]; Nsurl *url = [Nsurl urlwithstring:@ "http://dev.brc.com.cn:8085/api/meeting/list?access_token=    1b5e8731e5ff44928991b3098fe52464&type=32&showrows=10&page=1 "];   Initializes a task through a URL, which can be processed directly within the block with the returned data Nsurlsessiontask *task =[session datataskwithurl:url completionhandler:^ (NSData *data, NSURLResponse *response, nserror* error) {nsdictionary *dic = [Nsdictionary dictionarywithdictionary:[nsjsonserialization JSONObjec                Twithdata:data options:kniloptions Error:nil]];                NSLog (@ "999%@22", DIC);                ID Jsonarr = dic[@ "Data"];        Nsmutablearray *alltimearr = [Nsmutablearray array]; For (Nsdictionary *ordersdic in Jsonarr) {//1. Remove all occurrences of time [Alltimearr ADDOBJECT:[ORDERSDI        c[@ "StartTime"] substringtoindex:10];        } arrrrrrrrrr = [self Arraywithmemberisonly:alltimearr];                NSLog (@ "%@", arrrrrrrrrr);            For (NSString *nowtim in arrrrrrrrrr) {Nsmutablearray *arr = [[Nsmutablearray alloc] init]; For (Nsdictionary *ordersdictwo in Jsonarr) {nsstring *twotim = [ordersdictwo[@] Star       Ttime "] substringtoindex:10];         if ([Twotim Isequaltostring:nowtim]) {//2. Save each dictionary in the model array *tianjianmodel                    = [[Model Alloc]init];                    [Tianjianmodel Setvaluesforkeyswithdictionary:ordersdictwo];                                    [Arr Addobject:tianjianmodel];        }} [Temparray Addobject:arr];       } [_tableview Reloaddata];        }]; [Task resume];//});} Tell tableView the corresponding section to display a few lines-(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (Nsinteger)    section{Nsarray *arr = temparray[section]; return arr.count;} Tell TableView what to display, and when the cell is displayed, it will be called-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (        Nsindexpath *) indexpath{UITableViewCell *cell = [TableView dequeuereusablecellwithidentifier:@ "Cell"]; if (cell = = nil) {cell = [[UITableViewCell alloc] Initwithstyle:uitableviewcellstyLedefault reuseidentifier:@ "Cell"];    } Nsarray *arr = Temparray[indexpath.section];        Model *cellmodel = Arr[indexpath.row];        Cell.textLabel.text = Cellmodel.title; return cell;} Returns the grouping (section) number section-(Nsinteger) Numberofsectionsintableview: (UITableView *) tableview{return temparray.count;} Returns the title-(NSString *) of the head of the group TableView: (UITableView *) TableView titleforheaderinsection: (nsinteger) section{return [ NSString stringwithformat:@ "%ld Group", section];} Returns the height of the group head (segment header)-(CGFloat) TableView: (UITableView *) TableView heightforheaderinsection: (nsinteger) section{return 30;} Remove duplicate in array-(Nsarray *) Arraywithmemberisonly: (Nsarray *) array{nsmutablearray *categoryarray =[[nsmutablearray alloc]    INIT]; for (unsigned i = 0; i < [array count]; i++) {@autoreleasepool {if ([Categoryarray containsobject:[            Array objectatindex:i]]==no) {[Categoryarray addobject:[array objectatindex:i]]; }}} return CategoryarRay;} 

Data requested by the iOS development server is re-grouped by date