今天博主有一个获取设备唯一标识的需求,遇到了一些困难点,在此和大家分享,希望能够共同进步.
在iOS7.0之前,获取设备唯一标识的方法主要是获取UDID或MAC地址,但是在iOS7.0之后,为了保护用户隐私,苹果把他们都禁止了,使得设备的数据追踪变得越来越难.
iOS7.0之后,获取设备唯一标识的方法主要有两种:
1.广告标识符 IDFA
苹果为了完善自己的生态圈，在2010年前后推出了iAd广告网络。那么这个IDFA和这个iAd的关系就不言自喻了。如果不了解广告也没关系，简单来讲，现在的互联网广告精准投放需要了解用户数据，基于这些信息使得广告更有效率，唯一标识就很重要，就用到了IDFA.
advertisingIdentifier在AdSupport.framework的ASIdentifierManager类中，是其中两个属性中的一个.
可以说，用这个IDFA标识设备应该还是很精准的（不然iAd就彻底不用玩了），很多开发者还在使用.
2.IDFV+Key Chain
由于IDFV删除app之后再重新安装,标识符就变了,要解决这个问题,可以把第一次生成的ID保存到Key Chain中,删除app之后Key Chain中的数据还在就OK了.
#define KEY_UDID @"KEY_UDID"
#define KEY_IN_KEYCHAIN @"KEY_IN_KEYCHAIN"
#import <Security/Security.h>
#import "APPIdentificationManage.h"
@implementation APPIdentificationManage
singleton_implementation(APPIdentificationManage)
#pragma mark 获取UUID
/**
*此uuid在相同的一个程序里面-相同的vindor-相同的设备下是不会改变的
*此uuid是唯一的，但应用删除再重新安装后会变化，采取的措施是：只获取一次保存在钥匙串中，之后就从钥匙串中获取
**/
- (NSString *)openUDID
{
NSString *identifierForVendor = [[UIDevice currentDevice].identifierForVendor UUIDString];
return identifierForVendor;
}
#pragma mark 保存UUID到钥匙串
- (void)saveUDID:(NSString *)udid
{
NSMutableDictionary *udidKVPairs = [NSMutableDictionary dictionary];
[udidKVPairs setObject:udid forKey:KEY_UDID];
[[APPIdentificationManage sharedAPPIdentificationManage] save:KEY_IN_KEYCHAIN data:udidKVPairs];
}
#pragma mark 读取UUID
/**
*先从内存中获取uuid，如果没有再从钥匙串中获取，如果还没有就生成一个新的uuid，并保存到钥匙串中供以后使用
**/
- (id)readUDID
{
if (_uuid == nil || _uuid.length == 0) {
NSMutableDictionary *udidKVPairs = (NSMutableDictionary *)[[APPIdentificationManage sharedAPPIdentificationManage] load:KEY_IN_KEYCHAIN];
NSString *uuid = [udidKVPairs objectForKey:KEY_UDID];
if (uuid == nil || uuid.length == 0) {
uuid = [self openUDID];
[self saveUDID:uuid];
}
_uuid = uuid;
}
return _uuid;
}
#pragma mark 删除UUID
- (void)deleteUUID
{
[APPIdentificationManage delete:KEY_IN_KEYCHAIN];
}
#pragma mark 查询钥匙串
- (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
return [NSMutableDictionary dictionaryWithObjectsAndKeys: (__bridge_transfer id)kSecClassGenericPassword,(__bridge_transfer id)kSecClass, service, (__bridge_transfer id)kSecAttrService, service,(__bridge_transfer id)kSecAttrAccount, (__bridge_transfer id)kSecAttrAccessibleAfterFirstUnlock,(__bridge_transfer id)kSecAttrAccessible, nil nil];
}
#pragma mark 将数据保存到钥匙串
- (void)save:(NSString *)service data:(id)data {
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge_transfer id)kSecValueData];
SecItemAdd((__bridge_retained CFDictionaryRef)keychainQuery, NULL);
}
#pragma mark 加载钥匙串中数据
- (id)load:(NSString *)service {
id ret = nil;
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
[keychainQuery setObject:(id)kCFBooleanTrue forKey:(__bridge_transfer id)kSecReturnData];
[keychainQuery setObject:(__bridge_transfer id)kSecMatchLimitOne forKey:(__bridge_transfer id)kSecMatchLimit];
CFDataRef keyData = NULL;
if (SecItemCopyMatching((__bridge_retained CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
@try {
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge_transfer NSData *)keyData];
} @catch (NSException *e) {
NSLog(@"Unarchive of %@ failed: %@", service, e);
} @finally {
}
}
return ret;
}
#pragma mark 删除钥匙串中数据
- (void)delete:(NSString *)service {
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
}
@end