Objective c 使用uniqueIdentifier我们是否可以像他在回答中提到的那样，对较旧的ios版本使用uniqueIdentifier？对于新的ios版本，使用Identifier作为供应商，对于旧的uniqueIdentifier？？？这可能吗？检查此线程[Un

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使用

uniqueIdentifier

我们是否可以像他在回答中提到的那样，对较旧的ios版本使用uniqueIdentifier？对于新的ios版本，使用Identifier作为供应商，对于旧的uniqueIdentifier？？？这可能吗？检查此线程[UniqueIdentifier现在导致Apple拒绝][1][1]：谢谢我在哪里可以获得KeychainUtil类/包装器？

if (NSClassFromString(@"ASIdentifierManager")) {
    return [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];           
} else {
    // return other identifier generated with OpenUDID or some custom method
}

NSString *udid;

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0"))
    udid = [UIDevice currentDevice].identifierForVendor.UUIDString;
else
    udid = [UIDevice currentDevice].uniqueIdentifier;

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

//  IDManager.m


/*
 A replacement for deprecated uniqueIdentifier API. Apple restrict using this from 1st May, 2013.

 We have to consider,
    * iOS <6 have not the ASIIdentifer API
    * When the user upgrade from iOS < 6 to >6
        - Check if there is a UUID already stored in keychain. Then use that. 
            - In that case, this UUID is constant for whole device lifetime. Keychain item is not deleted with application deletion.
 */

#import "IDManager.h"
#import "KeychainUtils.h"
#import "CommonUtil.h"

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000
    #import <AdSupport/AdSupport.h>
#endif

#include <sys/socket.h> 
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>



/*  Apple confirmed this bug in their system in response to a Technical Support Incident request. They said that identifierForVendor and advertisingIdentifier sometimes returning all zeros can be seen both in development builds and apps downloaded over the air from the App Store. They have no work around and can't say when the problem will be fixed. */
#define kBuggyASIID             @"00000000-0000-0000-0000-000000000000"


#pragma mark 


#pragma mark 

@implementation IDManager

+ (NSString *) getUniqueID {

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000

    if (NSClassFromString(@"ASIdentifierManager")) {
        NSString * asiID = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
        if ([asiID compare:kBuggyASIID] == NSOrderedSame) {
            NSLog(@"Error: This device return buggy advertisingIdentifier.");
            return [IDManager getUniqueUUID];
        } else {
            return asiID;
        }

    } else {

#endif

        return [IDManager getUniqueUUID];

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000
    }
#endif

}

+ (NSString *) getUniqueUUID 
{
    NSError * error;
    NSString * uuid = [KeychainUtils getPasswordForUsername:@"UserName" andServiceName:@"YourServiceName" error:&error];
    if (error) {
        NSLog(@"Error geting unique UUID for this device! %@", [error localizedDescription]);
        return nil;
    }
    if (!uuid) {
        DLog(@"No UUID found. Creating a new one.");
        uuid = [IDManager getUUID];
        uuid = [CommonUtil md5String:uuid]; // create md5 hash for security reason
        [KeychainUtils storeUsername:@"UserName" andPassword:uuid forServiceName:@"YourServiceName" updateExisting:YES error:&error];
        if (error) {
            NSLog(@"Error geting unique UUID for this device! %@", [error localizedDescription]);
            return nil;
        }
    }
    return uuid;
}

+ (NSString *) readUUIDFromKeyChain {
    NSError * error;
    NSString * uuid = [KeychainUtils getPasswordForUsername:@"UserName" andServiceName:@"YourServiceName" error:&error];
    if (error) {
        NSLog(@"Error geting unique UUID for this device! %@", [error localizedDescription]);
        return nil;
    }
    return uuid;
}

/* NSUUID is after iOS 6. So we are using CFUUID for compatibility with iOS 4.3 */
+ (NSString *)getUUID
{
    CFUUIDRef theUUID = CFUUIDCreate(NULL);
    CFStringRef string = CFUUIDCreateString(NULL, theUUID);
    CFRelease(theUUID);
    return [(NSString *)string autorelease];
}

#pragma mark - MAC address

/* THIS WILL NOT WORK IN iOS 7. IT WILL RETURN A CONSTANT MAC ADDRESS ALL THE TIME.
 SEE - https://developer.apple.com/news/?id=8222013a
 */

// Return the local MAC address
// Courtesy of FreeBSD hackers email list
// Last fallback for unique identifier
+ (NSString *) getMACAddress
{
    int                 mib[6];
    size_t              len;
    char                *buf;
    unsigned char       *ptr;
    struct if_msghdr    *ifm;
    struct sockaddr_dl  *sdl;

    mib[0] = CTL_NET;
    mib[1] = AF_ROUTE;
    mib[2] = 0;
    mib[3] = AF_LINK;
    mib[4] = NET_RT_IFLIST;

    if ((mib[5] = if_nametoindex("en0")) == 0) {
        printf("Error: if_nametoindex error\n");
        return NULL;
    }

    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
        printf("Error: sysctl, take 1\n");
        return NULL;
    }

    if ((buf = malloc(len)) == NULL) {
        printf("Error: Memory allocation error\n");
        return NULL;
    }

    if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
        printf("Error: sysctl, take 2\n");
        free(buf); // Thanks, Remy "Psy" Demerest
        return NULL;
    }

    ifm = (struct if_msghdr *)buf;
    sdl = (struct sockaddr_dl *)(ifm + 1);
    ptr = (unsigned char *)LLADDR(sdl);
    NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
                           *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];

    free(buf);
    return outstring;
}

+ (NSString *) getHashedMACAddress
{
    NSString * mac = [IDManager getMACAddress];
    return [CommonUtil md5String:mac];
}

@end

if ([[UIDevice currentDevice]respondsToSelector:@selector(identifierForVendor)]) {
    return [UIDevice currentDevice].identifierForVendor.UUIDString;
}else{
    // return [UIDevice currentDevice]. uniqueIdentifier
    return [[UIDevice currentDevice] performSelector:@selector(uniqueIdentifier)];
}