iphone - KAL Calendar，如何实现 KalDataSource 以便我可以显示 iOS 内置日历应用程序中的事件？

Question

我已成功将 Kal Calendar 集成到我的应用程序中，这是我显示日历的方法

-(void)showDepartDatePicker{
    NSLog(@"showDepartDatePicker");
    if(_departDatePicker != nil){
        [self.navigationController pushViewController:_departDatePicker animated:YES];
    }else{
        _departDatePicker = [[KalViewController alloc] init];
        _departDatePicker.title = @"Departure Date";
        _departDatePicker.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Today" style:UIBarButtonItemStyleBordered target:self action:@selector(showAndSelectTodayDeparturePicker)];
        _departDatePicker.kvcDelegate = self;
        [self.navigationController pushViewController:_departDatePicker animated:YES];
    }

}

我在 KalViewController.h 中添加了以下内容，

@protocol KalViewControllerDelegate <NSObject>
@required
- (void)didSelectDate:(KalDate *)date andLoaded:(BOOL)loaded;

@end

和

@property (nonatomic, assign) id <KalViewControllerDelegate> kvcDelegate;

并在我的 viewController 中实现此委托(delegate)方法为

- (void)didSelectDate:(KalDate *)date andLoaded:(BOOL)loaded
{
    NSLog(@"Title : %@",[self.navigationController.visibleViewController title]);
    [self.navigationController popViewControllerAnimated:YES];
}

现在，根据我的问题，我想实现 KalDataSource，以便它显示标有事件的日期，并选择它在月 View 下方可用的表格 View 中显示事件详细信息。
如果您是 Kal Calendar 的新手，请参阅此链接 https://github.com/klazuka/Kal

第二个问题，这是我如何从 KalViewController.m 调用委托(delegate)方法

- (void)didSelectDate:(KalDate *)date
{
  self.selectedDate = [date NSDate];
  NSDate *from = [[date NSDate] cc_dateByMovingToBeginningOfDay];
  NSDate *to = [[date NSDate] cc_dateByMovingToEndOfDay];
  [self clearTable];
  [dataSource loadItemsFromDate:from toDate:to];
  [tableView reloadData];
  [tableView flashScrollIndicators];
  //line below calls my delegate method
  [self.kvcDelegate didSelectDate:date andLoaded:_loaded];
}

发生的情况是，当我调用 showDepartDatePicker 将 KalViewController 推送到我的导航堆栈时，它调用我的委托(delegate)方法 2 次(应该在日期选择时调用)，然后对于每个日期选择再次调用该委托(delegate)方法(1 次) 。

即使我想限制这个日历不显示过去的日期! 请帮我解决这个问题。

Answer 1

1. 定义一个实现KalDataSource协议(protocol)的类。请参阅下面的示例，了解实现 KalDataSource 协议(protocol)的类。

   //header file
   #import Kal.h"
   @interface MyClass : NSObject <KalDataSource>
   
   @property (nonatomic, weak) id<KalDataSourceCallbacks> kalCallbackDelegate;
   @property (nonatomic, strong) NSArray *events;
   
   @end
   
   ----------------------
   //implementation file
   
   - (void)presentingDatesFrom:(NSDate *)fromDate to:(NSDate *)toDate delegate:(id<KalDataSourceCallbacks>)callbackDelegate
   {
       //If you already have the events between fromDate and toDate then just call
       [callbackDelegate loadedDataSource:self];
   
       //Else store the callback variable in a property and do an asyncrhonous 
       //call to load the events.
       self.kalCallbackDelegate = callbackDelegate;
   
       //When the Asynchronous call is done, call
       [self.kalCallbackDelgate loadedDataSource:self];
   
   }
   
   - (void)removeAllItems
   {
       self.eventsForDay = nil;
   }
   
   - (NSArray *)markedDatesFrom:(NSDate *)fromDate to:(NSDate *)toDate
   {
       //self.events may have multiple events with the same date. This pulls only the unique dates.
       //Also assumes that the object has an eventDate property for the beginning of the day
       NSMutableSet *uniqueDatesSet = [NSMutableSet setWithArray:[self.events valueForKeyPath:@"@distinctUnionOfObjects.eventDate"]];
   
       NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self >= %@ && self <= %@", fromDate, toDate];
       NSArray *uniqueDates = [[uniqueDatesSet allObjects] filteredArrayUsingPredicate:predicate];
   
       return uniqueDates;
   
   }
   
   - (void)loadItemsFromDate:(NSDate *)fromDate toDate:(NSDate *)toDate
   {
       //filter for the events that occur between fromDate and toDate
       NSPredicate *predicate = [NSPredicate predicateWithFormat:@"eventDate >= %@ && eventDate <= %@", fromDate, toDate];
       NSArray *filteredArray = [self.events filteredArrayUsingPredicate:predicate];
   
       self.eventsForDay = [filteredArray sortedArrayUsingSelector:@selector(compareByEventTime:)];
   }
   

2. 要呈现 UITableViewCells，请在 KalDataSource 类中实现 tableView:cellForRowAtIndexPath:，就像在 UITableView 中一样。

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
   {
       Event *event = [self.events objectAtIndex:indexPath.row];
   
       static NSString *identifier = @"MyCell";
       UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
       if (!cell) {
           cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
           cell.selectionStyle = UITableViewCellSelectionStyleNone;
       }
   
       cell.textLabel.text = event.title;
   
       return cell;
   }
   

3. 如果您想知道何时选择 UITableViewCell，请定义一个实现 UITableViewDelegate 协议(protocol)的类并设置 _departDatePicker.delegate等于该类。然后您可以在该类中实现常规的 UITableViewDelegate 方法。

   - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
   {
       Event *event = [self.events objectAtIndex:indexPath.row];
       MyViewController *viewController = [[UIStoryboard storyboardWithName:@"iPhone" bundle:nil] instantiateViewControllerWithIdentifier:@"eventInfo"];
       viewController.event = event;
       [self.navigationController pushViewController:viewController animated:YES];
   }