ios - 从事件数组中按日期将 UITableView 分类为多个部分

Question

我从 2 个不同的共享 Google 日历中检索了数据，并将数据存储在一个数组中。我需要将数据排序到一个分段的 UITableView 中，按日期排序。

这是我的代码:

日历模型.h

#import "JSONModel.h"
#import "Time.h"

@interface CalendarModel : JSONModel

@property (strong, nonatomic) NSString* title;
@property (strong, nonatomic) NSArray<Time>* time;

@end

日历模型.m

#import "CalendarModel.h"

@implementation CalendarModel


+(JSONKeyMapper*)keyMapper
{
    return [[JSONKeyMapper alloc] initWithDictionary:@{
            @"gd$when": @"time",
            @"title.$t": @"title",
            }];
}

@end

时间.h

#import "JSONModel.h"

@protocol Time @end

@interface Time : JSONModel

@property (strong, nonatomic) NSString* startTime;
@property (strong, nonatomic) NSString* endTime;

@end

Time.m 什么都不做，因为它由 JSONModel 处理

SportsViewController.m

#import "SportsViewController.h"
#import "JSONModelLib.h"
#import "CalendarModel.h"
#import "Time.h"
#import "JSONValueTransformer.h"

@interface SportsViewController () 

@property (strong, nonatomic) NSMutableArray *events;
@property (strong, nonatomic) NSArray *music;

- (NSDate *)dateAtBeginningOfDayForDate:(NSDate *)inputDate;
- (NSDate *)dateByAddingYears:(NSInteger)numberOfYears toDate:(NSDate *)inputDate;

@end

@implementation SportsViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    //make HTTP call
    NSString* searchCall = [NSString stringWithFormat:@"http://www.google.com/calendar/feeds/kao1d80fd2u5kh7268caop11o4%%40group.calendar.google.com/public/full?alt=json"];
    NSString* searchCall2 = [NSString stringWithFormat:@"http://www.google.com/calendar/feeds/3qag5m8iad46mtvsnnqbtrcjjg%%40group.calendar.google.com/public/full?alt=json"];

    [JSONHTTPClient getJSONFromURLWithString: searchCall
                                  completion:^(NSDictionary *json, JSONModelError *err) {

                                      //got JSON back
                                      NSLog(@"Got Sports JSON from web: %@", json);

                                      if (err) {
                                          [[[UIAlertView alloc] initWithTitle:@"Error"
                                                                      message:[err localizedDescription]
                                                                     delegate:nil
                                                            cancelButtonTitle:@"Close"
                                                            otherButtonTitles: nil] show];
                                          return;
                                      }

                                      //initialize the models
                                      _events = [CalendarModel arrayOfModelsFromDictionaries:
                                                json[@"feed"][@"entry"]
                                                ];

                                      if (_events) NSLog(@"Loaded successfully sports models");

                                      //show the Events
                                      [_events addObjectsFromArray:_music];
                                      NSLog(@"%@", _events);
                                      [self.tableView reloadData];

                                  }];

    [JSONHTTPClient getJSONFromURLWithString: searchCall2
                                  completion:^(NSDictionary *json2, JSONModelError *err2) {

                                      //got JSON back
                                      NSLog(@"Got Music JSON from web: %@", json2);

                                      if (err2) {
                                          [[[UIAlertView alloc] initWithTitle:@"Error"
                                                                      message:[err2 localizedDescription]
                                                                     delegate:nil
                                                            cancelButtonTitle:@"Close"
                                                            otherButtonTitles: nil] show];
                                          return;
                                      }

                                      //initialize the models
                                      _music = [CalendarModel arrayOfModelsFromDictionaries:
                                                json2[@"feed"][@"entry"]
                                                ];

                                      if (_music) NSLog(@"Loaded successfully music models");
                                      [_events addObjectsFromArray:_music];
                                      //show the Events
                                      [self.tableView reloadData];

                                  }];
    //[events addObjectsFromArray:music];
    [self.tableView reloadData];

}
;

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    }



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

#pragma mark - table methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

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

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    CalendarModel* event = _events[indexPath.row];


    NSString *dato = [[event.time objectAtIndex:0] startTime];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss.SSSzzz";
    NSDate *gmtDate = [formatter dateFromString: dato];
    formatter.dateFormat = @"dd-MM-yyyy HH:mm";
    dato = [formatter stringFromDate:gmtDate];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"SportCell" forIndexPath:indexPath];
    cell.textLabel.text = [NSString stringWithFormat:@"%@",
                           event.title
                           ];
    cell.detailTextLabel.text = dato;

    return cell;
}
@end

所以基本上我需要排序的所有数据都驻留在 _events 数组中。我只是不知道如何按日期将其分类。 startTime 和 endTime 是 NSString 的原因是，这就是我调用 Google 上的共享日历返回的内容

Answer 1

首先对所有事件进行分组 - 你必须注意变量范围(我在本地使用天数和 groupedEvents，但你必须将它们声明为 ivars/properties)

    NSMutableArray *days = [NSMutableArray array];
    NSMutableDictionary *groupedEvents = [NSMutableDictionary dictionary];

- (void)groupEventsIntoDays
{
    for (CalendarModel *event in _events)
    {
        NSString *dato = [[event.time objectAtIndex:0] startTime];
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss.SSSzzz";
        NSDate *gmtDate = [formatter dateFromString: dato];

        if (![days containsObject:gmtDate])
        {
            [days addObject:gmtDate];
            [groupedEvents setObject:[NSMutableArray arrayWithObject:event] forKey:gmtDate];
        }
        else
        {
            [((NSMutableArray*)[groupedEvents objectForKey:gmtDate]) addObject:event];
        }
    }

    days = [[days sortedArrayUsingSelector:@selector(compare:)] mutableCopy];
}

章节标题:

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *header = [[UIView alloc] initWithFrame:CGRectMake(0,0,tableView.frame.size.width, 30)];
    UILabel *headerLabel = [[UILabel alloc] initWithFrame:header.bounds];
    [header addSubview:headerLabel];

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"dd-MM-yyyy HH:mm";
    NSString *dateAsString = [formatter stringFromDate:[days objectAtIndex:section]];

    [headerLabel setText:dateAsString];

    return header;
}

我只触及了您的 cellForRow 中的前两行 - 您可以根据需要修改其余部分以进行显示/格式化:

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    NSDate *date = [days objectAtIndex:indexPath.section];
    CalendarModel *event = [((NSMutableArray*)[groupedEvents objectForKey:date]) objectAtIndex:indexPath.row];

    NSString *dato = [[event.time objectAtIndex:0] startTime];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss.SSSzzz";
    NSDate *gmtDate = [formatter dateFromString: dato];
    formatter.dateFormat = @"dd-MM-yyyy HH:mm";
    dato = [formatter stringFromDate:gmtDate];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"SportCell" forIndexPath:indexPath];
    cell.textLabel.text = [NSString stringWithFormat:@"%@",
                           event.title
                           ];
    cell.detailTextLabel.text = dato;

    return cell;
}