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iOS编程——通过UUID和KeyChain来代替Mac地址实现iOS设备的唯一标示(OC版)
很多的应用都需要用到手机的唯一标示，而且要求这个唯一标示不能因为应用app的卸载或者改变而变化。
在iOS7以前是可以通过Mac地址来实现这个功能的，但是iOS7(包含)以后是无法获得Mac地址的；苹果官方推荐使用UUID，但是每次随着APP的卸载重装，UUID会随之发生变化，那该如何处理呢？
我们需要一个能在app卸载重装后不会改变的值，而keyChain恰巧就可以做到。配合UUID就可以实现了！让我们来分析下：
1.我们首先需要导入Security.frameWork（keychain依赖它），然后需要一个keychain管理器，一个uuid管理器，文件组成如下：
2.首先来看MyKeychainManager,其实就是对keychain的增、删、改、查，类似于数据库的处理。
先通过.h文件来开放下增、删、改、查四个接口：
#import <Foundation/Foundation.h> @interface MyKeyChainManager : NSObject + (NSMutableDictionary *)getKeychainQuery:(NSString *)service; + (void)save:(NSString *)service data:(id)data; + (id)load:(NSString *)service; + (void)delete:(NSString *)service; @end
.m文件实现接口，keychain的使用网上很多，直接贴代码了：
#import "MyKeyChainManager.h" @implementation MyKeyChainManager : NSObject + (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
3.再来看下MyUUIDManager文件，实现的是对UUID的增、删、改、查，其中save既是增也是改：
#import <Foundation/Foundation.h> @interface MyUUIDManager: NSObject +(void)saveUUID:(NSString *)uuid; +(NSString *)getUUID; +(void)deleteUUID; @end
.m文件来实现它：
#import "MyUUIDManager.h" #import "MyKeyChainManager.h" @implementation MyUUIDManager static NSString * const KEY_IN_KEYCHAIN = @"com.myuuid.uuid"; +(void)saveUUID:(NSString *)uuid{ if (uuid && uuid.length > 0) { [MyKeyChainManager save:KEY_IN_KEYCHAIN data:uuid]; } } +(NSString *)getUUID{ //先获取keychain里面的UUID字段，看是否存在 NSString *uuid = (NSString *)[MyKeyChainManager load:KEY_IN_KEYCHAIN]; //如果不存在则为首次获取UUID，所以获取保存。 if (!uuid || uuid.length == 0) { CFUUIDRef puuid = CFUUIDCreate( nil ); CFStringRef uuidString = CFUUIDCreateString( nil, puuid ); uuid = [NSString stringWithFormat:@"%@", uuidString]; [self saveUUID:uuid]; CFRelease(puuid); CFRelease(uuidString); } return uuid; } +(void)deleteUUID{ [MyKeyChainManager delete:KEY_IN_KEYCHAIN]; } @end
4.测试一下：
NSString *uuid = [MyUUIDManager getUUID]; NSLog(@"uuid: %@",uuid); 2015-08-10 18:14:07.641 MyTest[3190:220331] uuid: 839E055B-09A5-42E1-A46C-DF4481E23333
5.把app删除掉重新安装一下，再打印一下：
2015-08-10 18:22:37.122 MyTest[3214:222053] uuid: 839E055B-09A5-42E1-A46C-DF4481E23333
iOS编程——经过UUID和KeyChain来代替Mac地址实现iOS设备的唯一标示(OC版)
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原文地址：http://www.cnblogs.com/DoNetCShap/p/5175401.html
