实现iOS设备的唯一标识(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.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：

代码如下

//
//  CMKeyChain.h
//  UUID
//
//  Created by lxy on 2017/2/22.
//  Copyright © 2017年 xxx All rights reserved.
//

#import <Foundation/Foundation.h>

@interface CMKeyChain : 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：

//
//  CMKeyChain.m
//  UUID
//
//  Created by lxy on 2017/2/22.
//  Copyright © 2017年 xxx. All rights reserved.
//

#import "CMKeyChain.h"

@implementation CMKeyChain
+ (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
    CFDictionaryRef aRef = (__bridge_retained CFDictionaryRef)keychainQuery;
    SecItemDelete(aRef/*(__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(aRef/*(__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

2.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：

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//
//  CMUUIDManager.h
//  UUID
//
//  Created by lxy on 2017/2/22.
//  Copyright © 2017年 xxx All rights reserved.
//

#import <Foundation/Foundation.h>

@interface CMUUIDManager : NSObject

+(void)saveUUID:(NSString *)uuid;

+(id)readUUID;

+(void)deleteUUID;

@end

.m文件来实现它：

//
//  CMUUIDManager.m
//  UUID
//
//  Created by lxy on 2017/2/22.
//  Copyright © 2017年 xxx All rights reserved.
//


#import "CMUUIDManager.h"
#import "CMKeyChain.h"

@implementation CMUUIDManager
static NSString * const KEY_IN_KEYCHAIN = @"com.xxx.UUID";
static NSString * const KEY_UUID = @"com.xxx.UUID.uuid";
+(void)saveUUID:(NSString *)uuid
{
    NSMutableDictionary *usernameUuidPairs = [NSMutableDictionary dictionary];
    [usernameUuidPairs setObject:uuid forKey:KEY_UUID];
    [CMKeyChain save:KEY_IN_KEYCHAIN data:usernameUuidPairs];
}

+(id)readUUID
{
    NSMutableDictionary *usernameUuidPairs = (NSMutableDictionary *)[CMKeyChain load:KEY_IN_KEYCHAIN];
    return [usernameUuidPairs objectForKey:KEY_UUID];
}

+(void)deleteUUID
{
    [CMKeyChain delete:KEY_IN_KEYCHAIN];
}
@end

调用获取UUID

#import "AppDelegate.h"
#import "CMUUIDManager.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    //获得UUID存入keyChain中
    NSUUID *UUID=[UIDevice currentDevice].identifierForVendor;
    NSString *uuid=[CMUUIDManager readUUID];
    
    if (uuid==nil) {
        [CMUUIDManager deleteUUID];
        [CMUUIDManager saveUUID:UUID.UUIDString];
        uuid = UUID.UUIDString;
    }
    NSLog(@"uuid==%@",uuid);
    return YES;
}

此法经测试即使是app从iPhone设备上移除再次重装也不会改变UUID

参考地址:http://www.2cto.com/kf/201508/430431.html

实现iOS设备的唯一标识(OC版)

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