ios - TableView 行与 Swift 中的数据不一致

Question

我正在用我的联系人列表中的数据加载一个 UITableViewController。在模拟器中使用少量数据一切正常，但在我有 82 个联系人的 iPhone 上，我加载了不同数量的行，从 0 到大部分数据，但从来没有所有数据，而且总是不同的数量.这几乎就像在数据数组完成之前加载和显示表格一样。如果我将 numberOfRowsInSection 手动返回设置为 82，它工作正常，但是当设置为 contactdatalist.count 时，它会得到一个较小的数字。是不是我做错了什么，或者我可以减慢 tableview 的加载速度，直到所有数据加载完成？它在操作上似乎是异步的。

import UIKit
import AddressBook

class TableViewControllerContacts: UITableViewController {
    
    var contactdatalist = [ContactData]()
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem()
            
        self.contactdatalist = []

        let addressBook : ABAddressBookRef? = ABAddressBookCreateWithOptions(nil, nil).takeRetainedValue()
        ABAddressBookRequestAccessWithCompletion(addressBook, { (granted : Bool, error: CFError!) -> Void in
            if granted == true {
                let allContacts : NSArray = ABAddressBookCopyArrayOfAllPeople(addressBook).takeRetainedValue()
                for contactRef:ABRecordRef in allContacts { // first name
                    let myPBfirstname = ABRecordCopyValue(contactRef, kABPersonFirstNameProperty)?.takeRetainedValue() as! NSString? ?? ""
                    let myPBlastname = ABRecordCopyValue(contactRef, kABPersonLastNameProperty)?.takeRetainedValue() as! NSString? ?? ""
                    let phonesRef: ABMultiValueRef = ABRecordCopyValue(contactRef, kABPersonPhoneProperty)?.takeRetainedValue() as ABMultiValueRef? ?? ""
                    var phonesArray  = Array<Dictionary<String,String>>()
                    for var i:Int = 0; i < ABMultiValueGetCount(phonesRef); i++ {
                        let myPhLabel = ABMultiValueCopyLabelAtIndex(phonesRef, i)?.takeRetainedValue() as NSString? ?? ""
                        let myPhValue = ABMultiValueCopyValueAtIndex(phonesRef, i)?.takeRetainedValue() as! NSString? ?? ""
                        if myPhLabel.containsString("Mobile") {
                            self.contactdatalist.append(ContactData(firstname:myPBfirstname as String, lastname:myPBlastname as String, phone:myPhValue as String))
                        }
                    }
                }
            }
        })
        self.tableView.reloadData()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // #warning Potentially incomplete method implementation.
        // Return the number of sections.
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete method implementation.
        // Return the number of rows in the section.
        return self.contactdatalist.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = self.tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
        // Configure the cell...
        let contactdata = self.contactdatalist[indexPath.row]
        cell.textLabel!.text = ("\(contactdata.firstname) \(contactdata.lastname)")
        return cell
    }

Answer 1

更新您的 viewDidLoad，以便在单独的线程中获取联系人，并在获取联系人时加载 tableview。

override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem()

        self.contactdatalist = []

dispatch_async(dispatch_get_global_queue(Int(QOS_CLASS_USER_INITIATED.value), 0)) { 
    let addressBook : ABAddressBookRef? = ABAddressBookCreateWithOptions(nil, nil).takeRetainedValue()
        ABAddressBookRequestAccessWithCompletion(addressBook, { (granted : Bool, error: CFError!) -> Void in
            if granted == true {
                let allContacts : NSArray = ABAddressBookCopyArrayOfAllPeople(addressBook).takeRetainedValue()
                for contactRef:ABRecordRef in allContacts { // first name
                    let myPBfirstname = ABRecordCopyValue(contactRef, kABPersonFirstNameProperty)?.takeRetainedValue() as! NSString? ?? ""
                    let myPBlastname = ABRecordCopyValue(contactRef, kABPersonLastNameProperty)?.takeRetainedValue() as! NSString? ?? ""
                    let phonesRef: ABMultiValueRef = ABRecordCopyValue(contactRef, kABPersonPhoneProperty)?.takeRetainedValue() as ABMultiValueRef? ?? ""
                    var phonesArray  = Array<Dictionary<String,String>>()
                    for var i:Int = 0; i < ABMultiValueGetCount(phonesRef); i++ {
                        let myPhLabel = ABMultiValueCopyLabelAtIndex(phonesRef, i)?.takeRetainedValue() as NSString? ?? ""
                        let myPhValue = ABMultiValueCopyValueAtIndex(phonesRef, i)?.takeRetainedValue() as! NSString? ?? ""
                        if myPhLabel.containsString("Mobile") {
                            self.contactdatalist.append(ContactData(firstname:myPBfirstname as String, lastname:myPBlastname as String, phone:myPhValue as String))
                        }
                    }
                }
            }
        })

    dispatch_async(dispatch_get_main_queue()) { 
      self.tableView.reloadData() 
    }
  }
}