Swift 中 ABAddressBook iOS 8 中的内存泄漏

Question

我正在 iOS 8 中实现ABAddressBook，我首先创建了一个示例项目以开始工作。我使用 Single View Application 模板创建了项目。在ViewController.swiftViewController的viewDidAppear中我添加了以下代码：

if ABAddressBookGetAuthorizationStatus() != .Authorized {
    return
}
var error: Unmanaged<CFError>?
if let addressBook: ABAddressBook? = ABAddressBookCreateWithOptions(nil, &error)?.takeRetainedValue() {
    ABAddressBookRequestAccessWithCompletion(addressBook) { granted, error in
        if error == nil && granted {
            if let contacts = ABAddressBookCopyArrayOfAllPeople(addressBook)?.takeRetainedValue() as? NSArray {
                for contact in contacts {
                    print("new contact")
                }
            }
        }
    }
} else {
    print(error?.takeRetainedValue())
}

这是我唯一的代码，应用程序正在泄漏！我正在运行 Leaks 工具，但它没有提供足够好的上下文来说明应用程序泄漏的原因。

泄漏工具快照

调用树快照

泄漏周期快照

我没有发布应该发布的东西吗？我也不能打电话给CFRelease，因为我启用了ARC。

Answer 1

我无法重现，但值得的是，以下内容也没有泄漏：

var addressBook: ABAddressBookRef?

func extractABAddressBookRef(abRef: Unmanaged<ABAddressBookRef>!) -> ABAddressBookRef? {
    if let ab = abRef {
        return Unmanaged<NSObject>.fromOpaque(ab.toOpaque()).takeUnretainedValue()
    }
    return nil
}

func fetchAllContacts(completion: ((contacts: [String]?) -> Void)?) {
    let authorizationStatus = ABAddressBookGetAuthorizationStatus()
    switch authorizationStatus {
    case .NotDetermined:
        print("requesting access...")
        var errorRef: Unmanaged<CFError>? = nil
        addressBook = extractABAddressBookRef(ABAddressBookCreateWithOptions(nil, &errorRef))
        ABAddressBookRequestAccessWithCompletion(addressBook, { [weak self] success, error in
            if success {
                completion?(contacts: self?.getContactNames())
            }
            else {
                print("error")
                completion?(contacts: nil)
            }
        })
    case .Denied, .Restricted:
        print("access denied")
        completion?(contacts: nil)
    case .Authorized:
        print("access granted")
        completion?(contacts: self.getContactNames())
    }
}

func getContactNames() -> [String]? {
    var errorRef: Unmanaged<CFError>?
    addressBook = extractABAddressBookRef(ABAddressBookCreateWithOptions(nil, &errorRef))
    let contactList: NSArray = ABAddressBookCopyArrayOfAllPeople(addressBook).takeRetainedValue()
    print("records in the array \(contactList.count)")

    return contactList.map({ (record: AnyObject) -> String in
        let contactRef: ABRecordRef = record
        let contactName: String = ABRecordCopyCompositeName(contactRef).takeRetainedValue() as String
        return contactName
    })
}

override func viewDidLoad() {
    super.viewDidLoad()

    fetchAllContacts { (contacts) in
        print("fetched contacts \(contacts)")
    }
}