Keychain简单使用

#import <Foundation/Foundationh>
#import <Security/Securityh>
  
@interface MyKeychain : NSObject
  
+ (BOOL)save:(NSString*)service data:(id)data;
+ (id)load:(NSString*)service;
+ (void)delete:(NSString*)service;
  
@end
b)MyKeychainm
//
// MyKeychainm
// UUIDdemo
//
// Created by 555chy on 6/10/
// Copyright © 2016 555chy All rights reserved
//
  
#import "MyKeychainh"
  
@implementation MyKeychain
  
+ (NSMutableDictionary*) getKeychainQuery: (NSString*)service {
  return [NSMutableDictionary dictionaryWithObjectsAndKeys:
    (id)kSecClassGenericPassword, (id)kSecClass,
    service, (id)kSecAttrService,
    service, (id)kSecAttrAccount,
    (id)kSecAttrAccessibleAfterFirstUnlock, (id)kSecAttrAccessible,
   nil nil];
}
    //service :Key data :value
+ (BOOL) save:(NSString*)service data:(id)data {
  NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
  SecItemDelete((CFDictionaryRef)keychainQuery);
  [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];
  return SecItemAdd((CFDictionaryRef)keychainQuery, NULL) == noErr;
}
  //加载by KEY
+ (id) load:(NSString*)service {
  id ret = NULL;
  NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
  [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
  [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
  NSData *keyData = NULL;
  if(SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef*)(void*)&keyData) == noErr) {
    @try {
      ret = [NSKeyedUnarchiver unarchiveObjectWithData:keyData];
    }
    @catch (NSException *exception) {
      NSLog(@"Unarchive of %@ failed: %@", service, exception);
    }
    @finally {
    }
  }
  return ret;
}
  //删除by Key
+ (void) delete:(NSString*)service {
  NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
  SecItemDelete((CFDictionaryRef)keychainQuery);
}
  
@end
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