我有一个应用程序，需要在选择器中加载一个日历列表。虽然可以工作，但只能在应用程序崩溃并重新打开后才能使用。我不确定为什么在应用程序初始打开时无法正常工作。
日历权限请求：
func requestCalendarPermissions() {
eventInstance.requestAccess(to: .event, completion: {(accessGranted: Bool, error: Error?) in
if accessGranted == true {
print("Access Has Been Granted")
}
else {
print("Change Settings to Allow Access")
}
})
}
权限状态检查：
func checkStatus() {
let currentStatus = EKEventStore.authorizationStatus(for: EKEntityType.event)
if currentStatus == EKAuthorizationStatus.notDetermined {
requestCalendarPermissions()
}
else if currentStatus == EKAuthorizationStatus.authorized {
print("Access Has Been Granted")
}
else if (currentStatus == EKAuthorizationStatus.denied) || (currentStatus == EKAuthorizationStatus.restricted){
print("Access Has Been Denied")
}
}
PickerView 代码：
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return calendars.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return calendars[row].title
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
CalendarField.text = calendars[row].title
calID = calendars[row].calendarIdentifier
}
这个错误出现了：
获取所有日历的错误：Error Domain=EKCADErrorDomain Code=1013 "(null)"
应用程序最终崩溃，因为它试图填充pickerView，但没有数据可供填充。我确实加载了日历。
但是，由于某种原因，在应用程序崩溃并重新打开后，这种情况不会发生。
谢谢
[更新]
控制台输出：
2016年11月26日18:04:23.856 PTF[98143:2347570] 获取所有日历错误：错误域=EKCADErrorDomain，代码=1013，“（空白）”已加载日历2016年11月26日18:04:23.869 PTF[98143:2347569] 获取所有日历错误：错误域=EKCADErrorDomain，代码=1013，“（空白）”已加载日历。已授权访问2016年11月26日18:04:25.954 PTF[98143:2347569] 获取所有日历错误：错误域=EKCADErrorDomain，代码=1013，“（空白）”已加载日历。2016年11月26日18:04:46.620 PTF[98143:2347522] * 由于未捕获的异常“NSRangeException”，原因：“* [NSArray0 objectAtIndex：]：索引0超出了空NSArray的范围”终止应用程序。第一个抛出调用堆栈：（0 CoreFoundation 0x000000010bb6634b __exceptionPreprocess + 171 1 libobjc.A.dylib
0x000000010b5c721e objc_exception_throw + 48 2 CoreFoundation
0x000000010bb7dddd -[__NSArray0 objectAtIndex：] + 93 3
libswiftCore.dylib 0x000000010d95311d _TFVs12_ArrayBuffer19_getElementSlowPathfSiPs9AnyObject_ + 125 4 libswiftCore.dylib 0x000000010d953003 _TFVs12_ArrayBuffer10getElementfTSi20wasNativeTypeCheckedSb_x + 147 5 libswiftCore.dylib 0x000000010d963b8a _TFSag9subscriptFSix + 138 6 PTF 0x000000010af8df12 _TFC3PTF19MainScreenTableView10pickerViewfTCSo12UIPickerView12didSelectRowSi11inComponentSi_T_ + 226 7 PTF 0x000000010af8e10a _TToFC3PTF19MainScreenTableView10pickerViewfTCSo12UIPickerView12didSelectRowSi11inComponentSi_T_ + 74 8 UIKit 0x000000010c0d301d-[UIPickerView_sendSelectionChangedForComponent:notify:] + 104 9 UIKit 0x000000010c0d326e-[UIPickerView_sendSelectionChangedFromTable:notify:] + 370 10 UIKit 0x000000010c8a560d-[UIPickerTableView_scrollFinished] + 187 11 UIKit 0x000000010c8a57fd-[UIPickerTableView scrollViewDidEndDecelerating：] + 30 12 UIKit 0x000000010c1df821-[UIScrollView（UIScrollViewInternal）_scrollViewDidEndDeceleratingForDelegate] + 91 13 UIKit 0x000000010c1dc362-[UIScrollView（UIScrollViewInternal）_stopScrollDecelerationNotify：] + 316 14 UIKit 0x000000010c1dc5b9-[UIScrollView（UIScrollViewInternal）_stopScrollingNotify：pin：tramplingDragFlags：] + 505 15 UIKit 0x000000010c1d4503-[UIScrollView _smoothScrollWithUpdateTime：] + 3304 16 QuartzCore 0x0000000113fa3bd5 _ZN2CA7Display15DisplayLinkItem8dispatchEy + 57 17 QuartzCore 0x0000000113fa3a95 _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 449 18 CoreFoundation 0x000000010baf8964 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20 19 CoreFoundation 0x000000010baf85f3 __CFRunLoopDoTimer + 1075 20 CoreFoundation 0x000000010baf817a __CFRunLoopDoTimers + 250 21 CoreFoundation
0x000000010baeff01 __CFRunLoopRun + 2065 22 CoreFoundation
0x000000010baef494 CFRunLoopRunSpecific + 420 23 GraphicsServices
0x000000011124aa6f GSEventRunModal + 161 24 UIKit
0x000000010c0eff34 UIApplicationMain +