iOS UUID配合keychain的替换方案实现

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iOS UUID配合keychain的替换方案实现

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：

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#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

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#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　　

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#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

　　

 参考：http://blog.youkuaiyun.com/u011439689/article/details/18707387