ios - 检查 EKCalendar

Question

美好的一天!我通过 UIActivityItems 使用函数“将事件保存到日历”。在该函数中，我创建了新日历并将事件添加到该日历:

EKEventStore* eventStore = [[EKEventStore alloc] init];

// Get the calendar source
EKSource* localSource;
for (EKSource* source in eventStore.sources) {
    if (source.sourceType == EKSourceTypeLocal)
    {
        localSource = source;
        break;
    }
}

if (!localSource)
    return;

EKCalendar *newCalendar = [EKCalendar calendarForEntityType:EKEntityTypeEvent eventStore:eventStore];
calendar.source = localSource;
calendar.title = @"New Calendar";

NSError *errorCalendar;
[eventStore saveCalendar:newCalendar commit:YES error:&errorCalendar]; 

EKEvent *event  = [EKEvent eventWithEventStore:eventStore];
event.title     = @"Title";

event.startDate = startDate;
event.endDate   = endDate;

[event setCalendar:newCalendar];
// and etc.

它的工作原理。但每次下一次它都会再次创建名为“New Calendar”的新日历。如何检查具有该名称的日历是否已存在？以及如何更改日历类型？生日之类的。

Answer 1

首先，您需要在应用的整个生命周期内使用 EventStore 的单个实例，according to Apple .

因此我建议将 eventStore 设为 View Controller 的属性:

@property (nonatomic, retain) EKEventStore *eventStore;

在你的 viewDidLoad:

self.eventStore = [[EKEventStore alloc] init];

现在您可以在执行任何操作之前检查正在读取和写入的同一 eventStore 实例:

-(BOOL)checkForCalendar {
    //get an array of the user's calendar using your instance of the eventStore
    NSArray *calendarArray = [self.eventStore calendarsForEntityType:EKEntityTypeEvent];

    // The name of the calendar to check for. You can also save the calendarIdentifier and check for that if you want
    NSString *calNameToCheckFor = @"New Calendar";

    EKCalendar *cal;

    for (int x = 0; x < [calendarArray count]; x++) {

        cal = [calendarArray objectAtIndex:x];
        NSString *calTitle = [cal title];

        // if the calendar is found, return YES
        if (([calTitle isEqualToString:calNameToCheckFor]) {

            return YES;
        }
    }

    // Calendar name was not found, return NO;
    return NO;
}

-(void)saveNewEvent {

    // If the calendar does not already exist, create it before you save the event.
    if ([self checkForCalendar] == NO) { 

        // Get the calendar source
        EKSource* localSource;
        for (EKSource* source in eventStore.sources) {
            if (source.sourceType == EKSourceTypeLocal)
            {
                localSource = source;
                break;
            }
        }

        if (!localSource)
            return;

        EKCalendar *newCalendar = [EKCalendar calendarForEntityType:EKEntityTypeEvent eventStore:eventStore];
        calendar.source = localSource;
        calendar.title = @"New Calendar";

        NSError *errorCalendar;
        [eventStore saveCalendar:newCalendar commit:YES error:&errorCalendar];

    } 
        EKEvent *event  = [EKEvent eventWithEventStore:self.eventStore];
        event.title     = @"Title";
        event.startDate = startDate;
        event.endDate   = endDate;
        [event setCalendar:newCalendar];
        // and etc.
}