IOS7开发~UDID解决方法
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前言:IOS7中,UDID和MAC地址等设备唯一标识方法都被淘汰,但开发中,业务往往需要这个唯一标识,经过研究,还没找到可以完全替代UDID和MAC地址的方法,但退而求其次,找到了将UUID作为UDID使用的办法,UUID保证了序列号的唯一性,所以剩下问题就是解决如何保存UUID的问题了,经过调研,利用KeyChain可以保存数据,并且APP删除,重启机器情况下仍然不影响保存的数据,但如果用户刷系统,这种办法就不行了。下面奉上代码:
项目要引入:Security.framework
- #import <UIKit/UIKit.h>
- #import "KeychainHelper.h"
- @interface ViewController : UIViewController
- @end
- #import "ViewController.h"
- NSString * const KEY_DIC = @"com.company.app.dic";
- NSString * const KEY_UDID = @"com.company.app.kUdidTest";
- @interface ViewController ()
- @end
- @implementation ViewController
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- }
- - (NSString*) uuid
- {
- CFUUIDRef puuid = CFUUIDCreate(nil);
- CFStringRef uuidString = CFUUIDCreateString(nil, puuid);
- NSString *result = (NSString *)CFStringCreateCopy(NULL, uuidString);
- CFRelease(puuid);
- CFRelease(uuidString);
- return [result autorelease];
- }
- - (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
- {
- NSMutableDictionary *dic = (NSMutableDictionary *)[KeychainHelper load:KEY_DIC];
- NSString *udid = [dic objectForKey:KEY_UDID];
- if (udid)
- {
- NSLog(@"udid:%@", udid);
- }
- if (!udid)
- {
- NSLog(@"save");
- NSMutableDictionary *dic = [NSMutableDictionary dictionary];
- [dic setObject:[self uuid] forKey:KEY_UDID];
- [KeychainHelper save:KEY_DIC data:dic];
- }
- }
- @end
-------------------分割线---------------------
- #import <Foundation/Foundation.h>
- #import <Security/Security.h>
- @interface KeychainHelper : NSObject
- + (void) save:(NSString *)service data:(id)data;
- + (id) load:(NSString *)service;
- + (void) deleteData:(NSString *)service;
- @end
- #import "KeychainHelper.h"
- @implementation KeychainHelper
- + (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:(NSData *)keyData];
- } @catch (NSException *e) {
- NSLog(@"Unarchive of %@ failed: %@", service, e);
- } @finally {
- }
- }
- if (keyData)
- CFRelease(keyData);
- return ret;
- }
- + (void)deleteData:(NSString *)service
- {
- NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
- SecItemDelete((CFDictionaryRef)keychainQuery);
- }
- @end
这样就实现了即使删除App,当再次安装后还保存上次的数据不丢失。
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