当我在我的应用程序中发现一些不同类型的内存泄漏时，我正在处理 AddressBook 框架:

Leaked Object   #   Address Size    Responsible Library Responsible Frame
__NSCFArray 8   < multiple >    256 Bytes   AddressBook ABCMultiValueInsertAndCreateIdentifier
__NSCFString    7   < multiple >    224 Bytes   AppSupport  _sqliteStatementApplyValuesFromRecordWithNullValue
Malloc 32 Bytes 8   < multiple >    256 Bytes   AddressBook ABCMultiValueInsertAndCreateIdentifier
__NSCFArray 8   < multiple >    256 Bytes   AddressBook ABCMultiValueInsertAndCreateIdentifier
ABCMultiValue   8   < multiple >    256 Bytes   AddressBook ABCMultiValueCreate
Malloc 32 Bytes 7   < multiple >    224 Bytes   AddressBook ABCMultiValueInsertAndCreateIdentifier
__NSCFArray 7   < multiple >    224 Bytes   AddressBook ABCMultiValueInsertAndCreateIdentifier
Malloc 32 Bytes 5   < multiple >    160 Bytes   AddressBook ABCMultiValueInsertAndCreateIdentifier

这是我的代码:

- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person {

    SDAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];

    ABMultiValueRef multiRef = ABRecordCopyValue(person, kABPersonPhoneProperty);
    NSString *number = (__bridge NSString *) ABMultiValueCopyValueAtIndex(multiRef, 0);
    NSString *firstname = (__bridge NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty);
    NSString *lastname = (__bridge NSString *)ABRecordCopyValue(person, kABPersonLastNameProperty);

    number = (number ? number : @"");
    firstname = (firstname ? firstname : @"");
    lastname = (lastname ? lastname : @"");

    NSDictionary *dic = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:number, firstname, lastname, nil] forKeys:[NSArray arrayWithObjects:kSDPhoneNumberKey, kSDFirstnameKey, kSDLastnameKey, nil]];

    NSMutableArray *numberArray = [NSMutableArray arrayWithArray:appDelegate.contactArray];
    [numberArray addObject:dic];

    [appDelegate setContactArray:numberArray];

    [self.tableView reloadData];

    [self dismissModalViewControllerAnimated:YES];

    return NO;
}

有人知道是哪条线路造成了这些泄漏吗？

最佳答案

一般来说，任何名称中包含Copy 或Create 的Core Foundation 方法都应该将所有权转移给您的ARC 对象，或者您必须调用CFRelease你自己。因此，您应该转移三个 NSString 对象的所有权，并手动释放 multiRef。

要将所有权转移给 ARC，您应该使用 CFBridgingRelease，根据 WWDC 2012 - Modern Objective-C (大约 37:35 进入视频)，现在比以前的技术更受青睐，__bridging_transfer(尽管在幕后，它们是同一件事)。

无论如何，你的三个 NSString 对象的声明应该是:

NSString *number = CFBridgingRelease(ABMultiValueCopyValueAtIndex(multiRef, 0));
NSString *firstname = CFBridgingRelease(ABRecordCopyValue(person, kABPersonFirstNameProperty));
NSString *lastname = CFBridgingRelease(ABRecordCopyValue(person, kABPersonLastNameProperty));

这相当于:

NSString *number = (__bridge_transfer NSString *) ABMultiValueCopyValueAtIndex(multiRef, 0);
NSString *firstname = (__bridge_transfer NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty);
NSString *lastname = (__bridge_transfer NSString *)ABRecordCopyValue(person, kABPersonLastNameProperty);

此外，不要忘记也释放 multiRef:

CFRelease(multiRef);

顺便说一下，如果您运行静态分析器，我相信它会为您指出这些。从“产品”菜单中选择“分析”，或按 shift+command+B。

关于iOS - 内存泄漏地址簿，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14121441/