iOS 2.0版本以后UIDevice提供一个获取设备唯一标识符的方法uniqueIdentifier，通过该方法我们可以获取设备的序列号，这个也是目前为止唯一可以确认唯一的标示符。好景不长，因为该唯一标识符与手机一一对应，苹果觉得可能会泄露用户隐私，所以在iOS5之后该方法就被废弃掉了，因此iOS5以后不能获取手机IMEI，但是也是可以通过私有API获取手机的IMEI号的， 但是通过苹果私有API获取IMEI号，上架苹果商店会被拒掉的。
应用在iOS6及以下时，可以正确取道Mac地址，在iOS7上，会返回固定值。
这样带来的问题是无法区分具体的iOS设备，有些产品就非常难搞了，目前没有找到可以区分不同iOS设备的方法。 测试过mac地址，确实会返回固定值02:00:00:00:00:00
NSString *identifierForAdvertising = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
广告标示符是由系统存储着的。不过即使这是由系统存储的，但是有几种情况下，会重新生成广告标示符:
- 如果用户完全重置系统（(设置程序 ->通用 -> 还原 ->还原位置与隐私)，这个广告标示符会重新生成。
- 另外如果用户明确的还原广告(设置程序->通用 -> 关于本机 ->广告 ->还原广告标示符)，那么广告标示符也会重新生成
关于广告标示符的还原，有一点需要注意：如果程序在后台运行，此时用户“还原广告标示符”，然后再回到程序中，此时获取广告标示符并不会立即获得还原后的标示符。必须要终止程序，然后再重新启动程序，才能获得还原后的广告标示符。之所以会这样，因为ASIdentifierManager是一个单例。
In iOS 10.0 and later, the value of advertisingIdentifier is all zeroes when the user has limited ad tracking.
如果用户限制广告追踪，开发者获取IDFA将是 一串数字 0。
一般是在设置里还原，才会清空钥匙串。一般版本升级不会清空。
- KeyChainManager
- UUIDManager
#import <Foundation/Foundation.h>
@interface KeyChainManager : NSObject
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service;
+ (void)save:(NSString *)service data:(id)data;
+ (id)load:(NSString *)service;
+ (void)delete:(NSString *)service;
@end
#import "KeyChainManager.h"
#import <Security/Security.h>
@implementation KeyChainManager
+ (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];
}
+ (void)save:(NSString *)service data:(id)data
{
//Get search dictionary
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
//Delete old item before add new item
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
//Add new object to search dictionary(Attention:the data format)
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge_transfer id)kSecValueData];
//Add item to keychain with the search dictionary
SecItemAdd((__bridge_retained CFDictionaryRef)keychainQuery, NULL);
}
+ (id)load:(NSString *)service
{
id ret = nil;
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
//Configure the search setting
[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;
}
+ (void)delete:(NSString *)service
{
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
}
@end
#import <Foundation/Foundation.h>
@interface UUIDManager : NSObject
+(void)saveUUID:(NSString *)uuid;
+(NSString *)getUUID;
+(void)deleteUUID;
@end
#import "UUIDManager.h"
#import "KeyChainManager.h"
static NSString * const KEY_IN_KEYCHAIN = @"com.sube.dailycast.uuid";
@implementation UUIDManager
+(void)saveUUID:(NSString *)uuid
{
if (uuid && uuid.length > 0) {
[KeyChainManager save:KEY_IN_KEYCHAIN data:uuid];
}
}
+(NSString *)getUUID
{
NSString *uuid = [KeyChainManager load:KEY_IN_KEYCHAIN];
if (!uuid || uuid.length == 0) {
NSString *uuid = [[NSUUID UUID] UUIDString];
[self saveUUID:uuid];
}
return uuid;
}
+(void)deleteUUID
{
[KeyChainManager delete:KEY_IN_KEYCHAIN];
}
@end