How can I get number of objects in section, NSFetchedResultsController Swift

Question

How can I get number of objects in section of an NSFetchedResultcController in Swift?

    if let s = self.fetchedResultsController?.sections as? NSFetchedResultsSectionInfo {

    }

is giving me Cannot downcast from '[AnyObject]' to non-@objc protocol type NSFetchedResultsSectionInfo

 var d = self.fetchedResultsController?.sections[section].numberOfObjects

gives me does not have member named 'subscript'

Answer 1

You need to cast self.fetchedResultsController?.sections to an Array of NSFetchedResultsSectionInfo objects:

if let s = self.fetchedResultsController?.sections as? [NSFetchedResultsSectionInfo]

Then you can pass the section to the subscript and get the number of objects:

if let s = self.fetchedResultsController?.sections as? [NSFetchedResultsSectionInfo] {
    d = s[section].numberOfObjects
}

Answer 2

I think the currently accepted answer by Mike S was pre Swift 2.0

The following is working for me (Swift 2.1):

if let sections = fetchedResultsController?.sections {
    return sections[section].numberOfObjects
} else {
    return 0
}

Answer 3

This is what I have in my UITableViewController (Swift 4):

override func numberOfSections(in tableView: UITableView) -> Int {
    guard let sections = fetchedResultsController.sections else { return 0 }
    return sections.count
}