iOS編程——通過UUID和KeyChain來代替Mac地址實現iOS設備的唯一標示(OC版)

很多的應用都需要用到手機的唯一標示，而且要求這個唯一標示不能因為應用app的卸載或者改變而變化。

在iOS7以前是可以通過Mac地址來實現這個功能的，但是iOS7(包含)以后是無法獲得Mac地址的；蘋果官方推薦使用UUID，但是每次隨著APP的卸載重裝，UUID會隨之發生變化，那該如何處理呢？

我們需要一個能在app卸載重裝后不會改變的值，而keyChain恰巧就可以做到。配合UUID就可以實現了！讓我們來分析下：

1.我們首先需要導入Security.frameWork（keychain依賴它），然后需要一個keychain管理器，一個uuid管理器，文件組成如下：

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2.首先來看MyKeychainManager,其實就是對keychain的增、刪、改、查，類似于數據庫的處理。

先通過.h文件來開放下增、刪、改、查四個接口：

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#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

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.m文件實現接口，keychain的使用網上很多，直接貼代碼了：

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#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 dictionaryNSMutableDictionary *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

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3.再來看下MyUUIDManager文件，實現的是對UUID的增、刪、改、查，其中save既是增也是改：

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#import <Foundation/Foundation.h>@interface MyUUIDManager: NSObject+(void)saveUUID:(NSString *)uuid;+(NSString *)getUUID;+(void)deleteUUID;@end

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.m文件來實現它：

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#import "MyUUIDManager.h" #import "MyKeyChainManager.h"@implementation MyUUIDManagerstatic 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{//先獲取keychain里面的UUID字段，看是否存在NSString *uuid = (NSString *)[MyKeyChainManager load:KEY_IN_KEYCHAIN];//如果不存在則為首次獲取UUID，所以獲取保存。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

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4.測試一下：

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NSString *uuid = [MyUUIDManager getUUID];NSLog(@"uuid: %@",uuid); 2015-08-10 18:14:07.641 MyTest[3190:220331] uuid: 839E055B-09A5-42E1-A46C-DF4481E23333

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5.把app刪除掉重新安裝一下，再打印一下：

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2015-08-10 18:22:37.122 MyTest[3214:222053] uuid: 839E055B-09A5-42E1-A46C-DF4481E23333

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轉載于:https://www.cnblogs.com/DoNetCShap/p/5175401.html

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