刚刚发现，UIDevice uniqueIdentifier属性在iOS 5中已弃用，在iOS 7及以上版本中不可用。似乎没有可供选择的方法或属性。
我们现有的许多应用程序都紧密依赖于这个属性来唯一地识别特定的设备。今后我们该如何处理这个问题?
2011-2012年的文件建议:
特殊注意事项 不要使用uniqueIdentifier属性。创建特定的唯一标识符 你可以调用CFUUIDCreate函数来创建一个UUID，然后写入 使用NSUserDefaults类将它转换到默认数据库。
但是，如果用户卸载和重新安装应用程序，这个值就不一样了。
当前回答
虽然不完美，但却是UDID的最佳和最接近的替代品之一(在Swift中使用iOS 8.1和Xcode 6.1):
生成一个随机UUID
let strUUID: String = NSUUID().UUIDString
并使用KeychainWrapper库:
给keychain添加一个字符串值:
let saveSuccessful: Bool = KeychainWrapper.setString("Some String", forKey: "myKey")
从keychain中检索字符串值:
let retrievedString: String? = KeychainWrapper.stringForKey("myKey")
从keychain中删除一个字符串值:
let removeSuccessful: Bool = KeychainWrapper.removeObjectForKey("myKey")
该解决方案使用了keychain，因此存储在keychain中的记录将被持久化，即使在应用程序卸载和重新安装之后。删除该记录的唯一方法是重置设备的所有内容和设置。这就是为什么我提到这个替代方案并不完美，但仍然是iOS 8.1上使用Swift替代UDID的最佳方案之一。
其他回答
如果有人在寻找替代方案时偶然发现了这个问题。我在IDManager课上就采用了这种方法， 这是不同解的集合。KeyChainUtil是一个从keychain读取的包装器。 您还可以使用散列MAC地址作为一种唯一ID。
/* 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"
+ (NSString *) getUniqueID {
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 {
return [IDManager getUniqueUUID];
}
}
+ (NSString *) getUniqueUUID {
NSError * error;
NSString * uuid = [KeychainUtils getPasswordForUsername:kBuyassUser andServiceName:kIdOgBetilngService 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 = [Util md5String:uuid];
[KeychainUtils storeUsername:USER_NAME andPassword:uuid forServiceName:SERVICE_NAME updateExisting:YES error:&error];
if (error) {
NSLog(@"Error getting unique UUID for this device! %@", [error localizedDescription]);
return nil;
}
}
return uuid;
}
/* NSUUID is after iOS 6. */
+ (NSString *)GetUUID
{
CFUUIDRef theUUID = CFUUIDCreate(NULL);
CFStringRef string = CFUUIDCreateString(NULL, theUUID);
CFRelease(theUUID);
return [(NSString *)string autorelease];
}
#pragma mark - MAC address
// Return the local MAC addy
// 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 [Util md5String:mac];
}
+ (NSString *)md5String:(NSString *)plainText
{
if(plainText == nil || [plainText length] == 0)
return nil;
const char *value = [plainText UTF8String];
unsigned char outputBuffer[CC_MD5_DIGEST_LENGTH];
CC_MD5(value, strlen(value), outputBuffer);
NSMutableString *outputString = [[NSMutableString alloc] initWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(NSInteger count = 0; count < CC_MD5_DIGEST_LENGTH; count++){
[outputString appendFormat:@"%02x",outputBuffer[count]];
}
NSString * retString = [NSString stringWithString:outputString];
[outputString release];
return retString;
}
iOS 6中引入的UIDevice identifierForVendor可以满足你的需求。
identifierForVendor是一个字母数字字符串，用于唯一标识应用程序供应商的设备。(只读)
@property(nonatomic, readonly, retain) NSUUID *identifierForVendor
对于运行在同一设备上的来自同一供应商的应用程序，此属性的值是相同的。对于同一设备上来自不同供应商的应用程序返回不同的值，对于不同设备上的应用程序返回不同的值，与供应商无关。
在iOS 6.0及更高版本中可用，在UIDevice.h中声明
对于iOS 5，请参考此链接UIDevice-with-UniqueIdentifier-for-iOS-5
iOS 11引入了DeviceCheck框架。它有一个完整的解决方案，唯一地识别设备。
不要使用这些库——libOmnitureAppMeasurement，它使用了苹果不再支持的uniqueIdentifier
我还建议从uniqueIdentifier转换到这个开源库(2个简单的类别)，它利用设备的MAC地址和应用程序捆绑标识符在应用程序中生成一个唯一的ID，可以用作UDID的替代品。
请记住，与UDID不同，这个数字对每个应用程序都是不同的。
你只需要导入包含的NSString和UIDevice类别，并调用[[UIDevice currentDevice] uniqueDeviceIdentifier]，就像这样:
#import "UIDevice+IdentifierAddition.h"
#import "NSString+MD5Addition.h"
NSString *iosFiveUDID = [[UIDevice currentDevice] uniqueDeviceIdentifier]
你可以在Github上找到它:
带有UniqueIdentifier的UIDevice
下面是分类(只有。m文件-检查github项目的头文件):
UIDevice + IdentifierAddition.m
#import "UIDevice+IdentifierAddition.h"
#import "NSString+MD5Addition.h"
#include <sys/socket.h> // Per msqr
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>
@interface UIDevice(Private)
- (NSString *) macaddress;
@end
@implementation UIDevice (IdentifierAddition)
////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Private Methods
// Return the local MAC addy
// Courtesy of FreeBSD hackers email list
// Accidentally munged during previous update. Fixed thanks to erica sadun & mlamb.
- (NSString *) macaddress{
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("Could not allocate memory. error!\n");
return NULL;
}
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 2");
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;
}
////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Public Methods
- (NSString *) uniqueDeviceIdentifier{
NSString *macaddress = [[UIDevice currentDevice] macaddress];
NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];
NSString *stringToHash = [NSString stringWithFormat:@"%@%@",macaddress,bundleIdentifier];
NSString *uniqueIdentifier = [stringToHash stringFromMD5];
return uniqueIdentifier;
}
- (NSString *) uniqueGlobalDeviceIdentifier{
NSString *macaddress = [[UIDevice currentDevice] macaddress];
NSString *uniqueIdentifier = [macaddress stringFromMD5];
return uniqueIdentifier;
}
@end
NSString + MD5Addition.m:
#import "NSString+MD5Addition.h"
#import <CommonCrypto/CommonDigest.h>
@implementation NSString(MD5Addition)
- (NSString *) stringFromMD5{
if(self == nil || [self length] == 0)
return nil;
const char *value = [self UTF8String];
unsigned char outputBuffer[CC_MD5_DIGEST_LENGTH];
CC_MD5(value, strlen(value), outputBuffer);
NSMutableString *outputString = [[NSMutableString alloc] initWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(NSInteger count = 0; count < CC_MD5_DIGEST_LENGTH; count++){
[outputString appendFormat:@"%02x",outputBuffer[count]];
}
return [outputString autorelease];
}
@end
