iOS UUID配合keychain的替换方案实现 - Herooic

来源：互联网发布：淘宝飞猪客服电话编辑：程序博客网时间：2024/05/24 05:38

参考：http://blog.csdn.net/u011439689/article/details/18707387

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。

在应用里使用使用keyChain，我们需要导入Security.framework

要先声明公共区的名称，官方文档管这个名称叫“keychain access group”，声明的方法是新建一个plist文件，名字随便起，内容如下：

“yourAppID.com.yourCompany.whatever”就是你要起的公共区名称

获取UUID 并保存到keychain中：

#pragma mark--获取设备UUID-(NSString*) uuid {     if ([CHKeychain load:UUIDKEY]) {         NSString *result = [CHKeychain load:UUIDKEY];        return result;  }  else  {    CFUUIDRef puuid = CFUUIDCreate( nil );    CFStringRef uuidString = CFUUIDCreateString( nil, puuid );    NSString * result = (NSString *)CFStringCreateCopy( NULL, uuidString);    CFRelease(puuid);    CFRelease(uuidString);        [CHKeychain save:UUIDKEY data:result];        return [result autorelease];  }     return nil;}

CHKeychain 的实现代码（需要导入Security.framework）：

CHKeychain.h

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

CHKeychain.m

#import "CHKeychain.h"@implementation CHKeychain+ (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)delete:(NSString *)service {  NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];  SecItemDelete((CFDictionaryRef)keychainQuery);}@end

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