OC(廿二)-识别-iOS-设备的唯一性策略--UUID keyChain存储 - 图1

    iOS的keyChain服务提供了一种安全的保存私密信息（密码，序列号，证书等）的方式，每个ios程序都有一个独立的keyChain存储。相对于NSUserDefaults、文件保存等一般方式，keyChain保存更为安全，而且keyChain里保存的信息不会因App被删除而丢失，所以在重装App后，keychain里的数据还能使用,只有刷机或者越狱才对其中的数据有影响.

    思路如下:
    1,安装 APP 后自动生成一个 UUID
    2,检查keyChain中是否有相应关键字的 UUID,如果没有存储,反之不存储.
    3,keychain里的数据还能使用,只有刷机或者越狱才对其中的数据有影响.
    所以可以很有效保证设备唯一性需求.

    代码如下:(封装 keyChain 的方法)
    . h

    1. //
    2. //  KeyChainManager.h
    3. //  ChartDemo
    4. //
    5. //  Created by user on 2017/9/27.
    6. //  Copyright © 2017年 MK. All rights reserved.
    7. //
    9. #import <Foundation/Foundation.h>
    11. @interface KeyChainManager : NSObject
    13. + (NSString *)isExistUUID;
    15. /**
    16.  添加 UUID
    18.  @param uuid 添加的对象
    19.  */
    20. + (void ) addObject:(NSString *)uuid ;
    22. /**
    23.  删除 UUID
    25.  */
    26. + (void ) removeObject;
    27. @end

    .m

    1. //
    2. //  KeyChainManager.m
    3. //  ChartDemo
    4. //
    5. //  Created by user on 2017/9/27.
    6. //  Copyright © 2017年 MK. All rights reserved.
    7. //
    9. #import "KeyChainManager.h"
    10. #import <Security/Security.h>
    12. @implementation KeyChainManager
    15. static NSString * const MY_UUIDDictionaryKEY = @"com.MK.ChartDemo";
    16. static NSString * const MY_UUIDKEY = @"com.MK.ChartDemoKey";
    18. + (NSString *)isExistUUID{
    20.     NSString * uuid = (NSString *)[self showUUID];
    21.     NSLog(@"UUid : %@", uuid);
    22.     return uuid;
    24. }
    26. + (void) addObject:(NSString *)uuid{
    28.     if (uuid) {
    30.         NSMutableDictionary * dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:uuid,MY_UUIDDictionaryKEY, nil];
    31.         NSMutableDictionary * query = [self getKeyChainQuery:MY_UUIDKEY];
    33.         if (query) {
    35.             SecItemDelete((CFDictionaryRef)query);
    37.             [query setObject:[NSKeyedArchiver archivedDataWithRootObject:dict] forKey:(id)kSecValueData];
    39.             SecItemAdd((CFDictionaryRef)query, NULL);
    40.         }
    41.     }
    45. }
    47. + (void)removeObject{
    49.     SecItemDelete((CFDictionaryRef)[self getKeyChainQuery:MY_UUIDKEY]);
    51. }
    53. + (id)showUUID{
    55.     id selectObject = nil;
    56.     NSMutableDictionary * query = [self getKeyChainQuery:MY_UUIDKEY];
    58.     [query setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
    59.     [query setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    61.     CFDataRef data = NULL;
    62.     if (SecItemCopyMatching((CFDictionaryRef)query, (CFTypeRef *)&data) == noErr) {
    64.         @try{
    66.             selectObject = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)data];
    68.         }@catch (NSException * e){
    70.             NSLog(@"解包异常 %@ : %@", query, e);
    72.         }@finally{
    74.         }
    75.     }
    77.         if (data) {
    78.             CFRelease(data);
    80.         }
    82.     if (selectObject) {
    84.         return [((NSDictionary *)selectObject) objectForKey:MY_UUIDDictionaryKEY];
    85.     }
    87.         return nil;
    89. }
    91. /**
    92.  获取KeyChain的查询
    94.  @param key 关键字
    95.  @return 获得查询的 ref
    96.  */
    97. + (NSMutableDictionary *) getKeyChainQuery:(NSString *) key{
    99.     return [NSMutableDictionary dictionaryWithObjectsAndKeys:(id)kSecClassGenericPassword,(id)kSecClass,key, (id)kSecAttrService,key, (id)kSecAttrAccount,(id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,nil];
    100. }
    103. @end

    AppDelegate中的调用:

    2. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    3.     // Override point for customization after application launch.
    5.         if (![KeyChainManager isExistUUID]) {
    7.         [KeyChainManager addObject:[[NSUUID UUID] UUIDString]];
    8.     }
    10.     return YES;
    11. }