关于设备唯一标示UUID的问题与数据存储在KeyChain里边

来源：互联网发布：解析淘宝口令api 编辑：程序博客网时间：2024/06/06 05:01

UUID.h 代码如下：

#import <Foundation/Foundation.h>@interface UUID : NSObject+(NSString *)getUUID;@end

UUID.m 代码如下：

#import "UUID.h"#import "KeyChainStore.h"#define  KEY_USERNAME_PASSWORD @"com.company.app.usernamepassword"@implementation UUID+(NSString *)getUUID{    NSString * strUUID = (NSString *)[KeyChainStore load:@"com.company.app.usernamepassword"];       //首次执行该方法时，uuid为空    if ([strUUID isEqualToString:@""] || !strUUID)    {        //生成一个uuid的方法        CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);                strUUID = (NSString *)CFBridgingRelease(CFUUIDCreateString (kCFAllocatorDefault,uuidRef));                //将该uuid保存到keychain        [KeyChainStore save:KEY_USERNAME_PASSWORD data:strUUID];            }    return strUUID;}@end

KeyChainStore.h 代码如下

#import <Foundation/Foundation.h>@interface KeyChainStore : NSObject+ (void)save:(NSString *)service data:(id)data;+ (id)load:(NSString *)service;+ (void)deleteKeyData:(NSString *)service;@end

KeyChainStore.m 代码如下

////  KeyChainStore.m//  DaBangHui////  Created by DBH on 16/4/15.//  Copyright © 2016年张梦磊. All rights reserved.//#import "KeyChainStore.h"@implementation KeyChainStore+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {    return [NSMutableDictionary dictionaryWithObjectsAndKeys:            (id)kSecClassGenericPassword,(id)kSecClass,            service, (id)kSecAttrService,            service, (id)kSecAttrAccount,            (id)kSecAttrAccessibleAfterFirstUnlock,(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((CFDictionaryRef)keychainQuery);    //Add new object to search dictionary(Attention:the data format)    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];    //Add item to keychain with the search dictionary    SecItemAdd((CFDictionaryRef)keychainQuery, NULL);}+ (id)load:(NSString *)service {    id ret = nil;    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];    //Configure the search setting    //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];    [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];    CFDataRef keyData = NULL;    if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {        @try {            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];        } @catch (NSException *e) {            NSLog(@"Unarchive of %@ failed: %@", service, e);        } @finally {        }    }    if (keyData)        CFRelease(keyData);    return ret;}+ (void)deleteKeyData:(NSString *)service {    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];    SecItemDelete((CFDictionaryRef)keychainQuery);}@end

直接调用

[UUID getUUID]

0 0