blocks|key|2361524|text|在我的应用程序中，我发现当获取eventIdentifier的eventStore被释放时，如果你请求它，它会返回nil。但是如果你在请求eventIdentifier之前，它会返回id，没问题。然后，您可以释放EKEventStore实例并请求标识符，这是没有问题的……它似乎需要eventStore来检索id，但我没有收到任何警告。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2361525|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my app I found out that if you ask for the eventIdentifier when the eventStore that fetched it has been released, it returns nil. But if you ask for the eventIdentifier before it will return the id ok. You can then release the EKEventStore instance and ask for the identifier with no problem.... Seems that it needs the eventStore to retrieve the id, but I get no warnings.

blocks|key|449494|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|449495|当我尝试获取EKEvent的标识符时，得到的结果都是nil值|blockquote|449496|449497|449498|在检索标识符之前，请尝试保存并提交事件：|449499|[eventStore+saveEvent:event+span:EKSpanThisEvent+commit:YES+error:&err];
NSString+*strId+=+[[NSString+alloc]+initWithFormat:@"%25@",+event.eventIdentifier];|code-block|syntax|javascript|449500|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|O|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|P|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|Q|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|R|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|S|7|@]|8|@]|9|$]]|$1|H|3|I|4|J|6|T|7|@]|8|@]|9|$K|L]]|$1|M|3|-4|4|5|6|U|7|@]|8|@]|9|$]]]|N|$]]

<blockquote>
 When I try to get the identifier of an EKEvent, all I get is a nil value
</blockquote>

Try to save AND commit your event before retrieving the identifier :

<pre><code>[eventStore saveEvent:event span:EKSpanThisEvent commit:YES error:&amp;err];
NSString *strId = [[NSString alloc] initWithFormat:@"%@", event.eventIdentifier];
</code></pre>

blocks|key|3484674|text|在将事件添加到EKEventStore时设置eventIdentifier。如果您尝试在添加之前访问此值，它将返回null。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3484675|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

eventIdentifier is set when the event is added to the EKEventStore. If you try to access this value before adding it, it would return null.

blocks|key|446931|text|通过这个问题，在提交到数据库之前，eventIdentifier将为null，因此您需要在saveEvent函数[self.eventStore+saveEvent:event+span:EKSpanThisEvent+commit:YES+error:&error];中使用commit:YES|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|446932|在此之后，您可以获得eventIdentifier。|446933|我的错误是传递了一个NO+to+commit:参数。|446934|entityMap^0|H|F|1K|27|41|3|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

Just going through this problem, turnout the <code>eventIdentifier</code> will be null before commit to database, 
so you need a commit:<code>YES</code> in the saveEvent function <code>[self.eventStore saveEvent:event span:EKSpanThisEvent commit:YES error:&amp;error];</code> 

After that, you can get the eventIdentifier. 

My fault was pass a NO to commit: parameter.

blocks|key|3484733|text|对我来说，eventIdentifier是空的，因为我没有设置endDate。因此，如果在创建该事件时出现任何错误，则eventIdentifier通常可以为null。您可以检查错误，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3484734|NSError+*err+=+nil;
[store+saveEvent:event+span:EKSpanThisEvent+commit:YES+error:&err];
NSLog(@"Error+:+%25@",err);|code-block|syntax|javascript|3484735|entityMap^0|5|F|V|7|1N|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

For me, the <code>eventIdentifier</code> is null because I was not setting the <code>endDate</code>. So generally the <code>eventIdentifier</code> can be null if there are any error on creating that event. You can check for errors like this:

<pre><code>NSError *err = nil;
[store saveEvent:event span:EKSpanThisEvent commit:YES error:&amp;err];
NSLog(@"Error : %@",err);
</code></pre>

blocks|key|2361582|text|保存事件后才会生成EKEvent+eventIdendifier。将事件保存到EKEventStore后，您可以访问/存储eventIdentifier|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2361583|++++[store+saveEvent:event+span:EKSpanThisEvent+error:&err];
++++NSString+*eventIdentifier+=+event.eventIdentifier;|code-block|syntax|javascript|2361584|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The EKEvent eventIdendifier isn't generated until the event is saved. You can access/store the eventIdentifier after you've saved the event to the EKEventStore

<pre><code> [store saveEvent:event span:EKSpanThisEvent error:&amp;err];
 NSString *eventIdentifier = event.eventIdentifier;
</code></pre>

blocks|key|2356734|text|对于Swift+3|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2356735|我发现，问题是我在检索日期的函数中创建了存储。|2356736|在函数外部创建存储并使用它的实例解决了这个问题。|2356737|class+CalendarServices:+NSObject+{

++++var+store+=+EKEventStore()

++++func+fetchEventKitCalendarEvents(date:+Date,+completion:+@escaping+(_+events:+[EKEvent]?,+_+error:+Error?)->())+{

++++++++let+calendar+=+Calendar.current

++++++++guard+self.getEventKitAuthorizationStatus()+==+.authorized+else+{
++++++++++++completion(nil,+CoreServices.setError(message:+"AuthorizationStatus+!=+authorized"))
++++++++++++return
++++++++}

++++++++guard+let+endDate+=+calendar.date(byAdding:+.day,+value:+1,+to:+date)++else+{
++++++++++++completion(nil,+CoreServices.setError(message:+"Error+creating+endDate"))
++++++++++++return
++++++++}

++++++++CoreServices.background+{

++++++++++++let+predicate+=+self.store.predicateForEvents(withStart:+date,+end:+endDate,+calendars:+self.fetchEventKitCalendars())

++++++++++++let+events+=+self.store.events(matching:+predicate).sorted()+{
++++++++++++++++(e1:+EKEvent,+e2:+EKEvent)+->+Bool+in
++++++++++++++++return+e1.startDate.compare(e2.startDate)+==+.orderedAscending
++++++++++++}

++++++++++++CoreServices.async+{

++++++++++++++++completion(events,+nil)

++++++++++++}

++++++++}

++++}

}|code-block|syntax|javascript|2356738|entityMap^0|2|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|V|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

For Swift 3

I have found out, that the issue was that I have created the store within the function that retrieves the date.

Creating the store outside of the function and using its instance solved the issue.

<pre><code>class CalendarServices: NSObject {

 var store = EKEventStore()

 func fetchEventKitCalendarEvents(date: Date, completion: @escaping (_ events: [EKEvent]?, _ error: Error?)-&gt;()) {

 let calendar = Calendar.current

 guard self.getEventKitAuthorizationStatus() == .authorized else {
 completion(nil, CoreServices.setError(message: "AuthorizationStatus != authorized"))
 return
 }

 guard let endDate = calendar.date(byAdding: .day, value: 1, to: date) else {
 completion(nil, CoreServices.setError(message: "Error creating endDate"))
 return
 }

 CoreServices.background {

 let predicate = self.store.predicateForEvents(withStart: date, end: endDate, calendars: self.fetchEventKitCalendars())

 let events = self.store.events(matching: predicate).sorted() {
 (e1: EKEvent, e2: EKEvent) -&gt; Bool in
 return e1.startDate.compare(e2.startDate) == .orderedAscending
 }

 CoreServices.async {

 completion(events, nil)

 }

 }

 }

}
</code></pre>

When I try to get the identifier of an EKEvent, all I get is a nil value. Since in iOS5 EKEvent is a subclass of EKCalendarItem, I figured I might be able to get the EKCalendarItem's UUID, but that returns nil as well. 

Every now and then I also get this error while trying to access the identifier or UUID property: 

<pre><code>CADObjectGetInlineStringProperty failed fetching uniqueID for EKPersistentEvent with error Error Domain=NSMachErrorDomain Code=268435459 "The operation couldn’t be completed. (Mach error 268435459 - (ipc/send) invalid destination port)"
</code></pre>

I've been stuck on this problem for quite some time now, but figured it would be iOS5 beta related. But since we're now at iOS5, it's still not working.

EKEvent eventIdentifier returns null

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我尝试获取EKEvent的标识符时，我得到的只是一个nil值。因为在iOS5中EKEvent是EKCalendarItem的子类，所以我想我也许能够获得EKCalendarItem的UUID，但这也返回了nil。当我试图访问identifier或UUID属性时，有时也会遇到这样的错误：CADObjectGetInlineStringProperty failed fetching uniqueI

问EKEvent eventIdentifier返回null
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问EKEvent eventIdentifier返回null
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