ios - 调用函数 'ABRecordCopyValue' 返回一个保留计数为 +1 的 corefoundation 对象

Question

我的项目中有以下代码

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

    [popContactsForm dismissPopoverAnimated:YES];

    [ssemailvc setName: (NSString *)ABRecordCopyValue(person,kABPersonFirstNameProperty)];        
    ABMultiValueRef emails = (NSString *)ABRecordCopyValue(person,kABPersonEmailProperty);


    if (ABMultiValueGetCount(emails)>0) {
        [ssemailvc setEmail:(NSString *)ABMultiValueCopyValueAtIndex(emails,0)];
    }else [ssemailvc setEmail:@""];

    CFRelease(emails);


    [peoplePicker dismissModalViewControllerAnimated:YES];      
    [popEmailForm setPopoverContentSize:CGSizeMake(350.0, 225.0)];

    return NO;
}

我收到了警告

1.call to function 'ABRecordCopyValue' returns a corefoundation object with a +1 retain count 2.object leaked:allocated object is not referenced later in the execution and has a retain count of +1

请告诉我如何克服这个问题

Answer 1

如果使用 ARC，您可以使用桥接转换:

CFStringRef name = (CFStringRef)ABRecordCopyValue(person,kABPersonFirstNameProperty);
[ssemailvc setName:(__bridge NSString*)name];
CFRelease(name);

或桥接传输:

NSString * name = (__bridge_transfer NSString *)ABRecordCopyValue(person,kABPersonFirstNameProperty);
[ssemailvc setName:name];

---

如果您正在使用 MRC:

CFStringRef name = (CFStringRef)ABRecordCopyValue(person,kABPersonFirstNameProperty);
[ssemailvc setName:(NSString*)name];
CFRelease(name);