将 iOS 联系人提取到 tableview，但直到我单击另一个选项卡栏项并返回 tableview 选项卡后，才会显示 Tableview 数据

Question

This function is called in my "viewDidLoad()". I am able to retrieve all contacts successfully, though the data doesn't show up, until I click another tab bar item, then return to the tableview tab bar item. Here is my code ..

 func getContacts()
     {
         print("Attempting to fetch Contacts")
         let store = CNContactStore()

         store.requestAccess(for: .contacts) { (granted, err) in
             if let err = err {
                 print("failed to request Access", err)
                 return
             }
         if granted {
             print("access granted")
             let keys = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactPhoneNumbersKey]
             let request = CNContactFetchRequest(keysToFetch: keys as [CNKeyDescriptor])
            request.sortOrder = CNContactSortOrder.userDefault
             do {
                var contactNames = [ContactNames]()

                 try store.enumerateContacts(with: request, usingBlock: {(contact, stopPointerIfYouWantToStopEnumerating) in

                    contactNames.append(ContactNames(contact: contact))

                 })

                self.contactsArray = contactNames


             }catch let err {
                 print("Failed to enumerate contacts", err)
             }


         } else{
             print("access denied")
             }

         }

     }

Answer 1

Your data won't have been loaded by the first time the tableview is populated. It works when you navigate using the tabs because the data has loaded at the point you return to the tableview tab and this forces a reload of the tableview.

Assuming your tableview data source is using self.contactsArray you just need to call tableview.reloadData() after assigning your data to self.contactsArray .

Be sure to do this on the main thread.

self.contactArray = contactNames
DispatchQueue.main.async {
    self.tableView.reloadData()
}