ios 通讯录访问权限

通讯录访问权限   

 ABAddressBookRef tmpAddressBook = nil;
    
    if ([[UIDevice currentDevice].systemVersion floatValue]>=6.0) {
        tmpAddressBook=ABAddressBookCreateWithOptions(NULL, NULL);
        dispatch_semaphore_t sema=dispatch_semaphore_create(0);
        ABAddressBookRequestAccessWithCompletion(tmpAddressBook, ^(bool greanted, CFErrorRef error){
            dispatch_semaphore_signal(sema);
            accessGranted = greanted;
        });
        
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
        dispatch_release(sema);
    }
    else
    {
        accessGranted = YES;
        tmpAddressBook =ABAddressBookCreate();
    }