ios - Swift 4 如何从日历中获取所有事件？
<p><p>我使用的是 Swift 4.1。我想编写一个函数来收集 iOS 日历应用程序中所有日历中的所有事件。感谢stackoverflow上的这个答案:<a href="https://stackoverflow.com/questions/33618685/how-to-get-all-events-out-of-a-calendar-swift" rel="noreferrer noopener nofollow">How to get all Events out of a Calendar (Swift)</a>我能够编写自己的 <code>class</code> 并将其称为 <code>Cale</code>。请看这个:</p>
<pre><code>import UIKit
import EventKit
class Cale {
private func createDate(year: Int) -> Date {
var components = DateComponents()
components.year = year
components.timeZone = TimeZone(secondsFromGMT: 0)
return Calendar.current.date(from: components)!
}
private let eventStore = EKEventStore()
private func get() {
let calendars = eventStore.calendars(for: .event)
for calendar in calendars {
// This checking will remove Birthdays and Hollidays callendars
guard calendar.allowsContentModifications else {
continue
}
let start = createDate(year: 2016)
let end = createDate(year: 2025)
print("start: \(start)")
print("end: \(end)")
let predicate = eventStore.predicateForEvents(withStart: start, end: end, calendars: )
print("predicate: \(predicate)")
let events = eventStore.events(matching: predicate)
for event in events {
print(" title: \(event.title!)")
print("startDate: \(event.startDate!)")
print("endDate: \(event.endDate!)")
}
}
}
func checkStatusAndGetAllEvents() {
let currentStatus = EKEventStore.authorizationStatus(for: EKEntityType.event)
switch currentStatus {
case .authorized:
//print("authorized")
self.get()
case .notDetermined:
//print("notDetermined")
eventStore.requestAccess(to: .event) { accessGranted, error in
if accessGranted {
self.get()
} else {
print("Change Settings to Allow Access")
}
}
case .restricted:
print("restricted")
case .denied:
print("denied")
}
}
}
</code></pre>
<p>非常简单的类，你可以使用它，它可以工作，但有一个异常(exception)。
主要函数是 <code>get()</code> 在这个函数中，我基于两个日期创建谓词:开始和结束。如您所见，开始日期是:</p>
<blockquote>
<p>2016-01-01 00:00:00 +0000</p>
</blockquote>
<p>结束日期是:</p>
<blockquote>
<p>2025-01-01 00:00:00 +0000</p>
</blockquote>
<p>但是如果我们运行程序，我们会看到谓词是这样的:</p>
<blockquote>
<p>CADEventPredicate start:01/01/2016, 03:00; end:01/01/2020, 03:00;
cals:(
2 )</p>
</blockquote>
<p>仅从 2016 年到 2020 年，4 年!我已经在不同的日期对其进行了测试，但我可以得到最大间隔为 4 年的谓词。这意味着，它不会给我所有的事件!所以问题是:如何从日历中获取所有事件？如果可能，不要使用日期!</p>
<p>感谢您对 future 的任何帮助或建议!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>如果有人仍然想知道，Apple 故意将其限制为四年。</p>
<p>来自 <a href="https://developer.apple.com/documentation/eventkit/ekeventstore/1507479-predicateforevents" rel="noreferrer noopener nofollow">predicateForEvents(withStart:end:calendars:)</a> :</p>
<blockquote>
<p>For performance reasons, this method matches only those events within a four year time span. If the date range between startDate and endDate is greater than four years, it is shortened to the first four years.</p>
</blockquote>
<p>如果您想要一个更长的范围，我想您必须将其包装在您自己的函数中以将其拆分为四年 block 。</p></p>
<p style="font-size: 20px;">关于ios - Swift 4 如何从日历中获取所有事件？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/51439574/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/51439574/
</a>
</p>
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