- (IBAction)add:(id)sender {if (nameField.text.length > 0 && passwordField.text.length > 0) {// 一个mutable字典结构存储item信息        NSMutableDictionary* dic = [NSMutableDictionary dictionary];// 确定所属的类class        [dic setObject:(id)kSecClassGenericPassword forKey:(id)kSecClass];// 设置其他属性attributes        [dic setObject:nameField.text forKey:(id)kSecAttrAccount];// 添加密码 secValue  注意是object 是 NSData        [dic setObject:[passwordField.text dataUsingEncoding:NSUTF8StringEncoding] forKey:(id)kSecValueData];// SecItemAdd        OSStatus s = SecItemAdd((CFDictionaryRef)dic, NULL);        NSLog(@"add : %ld",s);    }}

// 查找全部- (IBAction)sel:(id)sender {    NSDictionary* query = [NSDictionary dictionaryWithObjectsAndKeys:kSecClassGenericPassword,kSecClass,                            kSecMatchLimitAll,kSecMatchLimit,                           kCFBooleanTrue,kSecReturnAttributes,nil];    CFTypeRef result = nil;    OSStatus s = SecItemCopyMatching((CFDictionaryRef)query, &result);    NSLog(@"se;ect all : %ld",s);    NSLog(@"%@",result);}

// 按名称查找- (IBAction)sname:(id)sender {if (nameField.text.length >0) {// 查找条件：1.class 2.attributes 3.search option        NSDictionary* query = [NSDictionary dictionaryWithObjectsAndKeys:kSecClassGenericPassword,kSecClass,                                nameField.text,kSecAttrAccount,                               kCFBooleanTrue,kSecReturnAttributes,nil];        CFTypeRef result = nil;// 先找到一个item        OSStatus s = SecItemCopyMatching((CFDictionaryRef)query, &result);        NSLog(@"select name : %ld",s);  //  errSecItemNotFound 就是找不到        NSLog(@"%@",result);        if (s == noErr) {// 继续查找item的secValue            NSMutableDictionary* dic = [NSMutableDictionary dictionaryWithDictionary:result];// 存储格式            [dic setObject:(id)kCFBooleanTrue forKey:kSecReturnData];// 确定class            [dic setObject:[query objectForKey:kSecClass] forKey:kSecClass];            NSData* data = nil;// 查找secValue            if (SecItemCopyMatching((CFDictionaryRef)dic, (CFTypeRef*)&data) == noErr) {if (data.length)                    NSLog(@"%@",[[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]);            }        }    }}

- (IBAction)update:(id)sender {if (nameField.text.length >0 && passwordField.text.length > 0) {// 先查找看看有没有        NSDictionary* query = [NSDictionary dictionaryWithObjectsAndKeys:kSecClassGenericPassword,kSecClass,                                nameField.text,kSecAttrAccount,                               kCFBooleanTrue,kSecReturnAttributes,nil];

        CFTypeRef result = nil;if (SecItemCopyMatching((CFDictionaryRef)query, &result) == noErr)        {    // 更新后的数据，基础是搜到的result            NSMutableDictionary* update = [NSMutableDictionary dictionaryWithDictionary:(NSDictionary*)result];// 修改要跟新的项 注意先加后删的class项            [update setObject:[query objectForKey:kSecClass] forKey:kSecClass];            [update setObject:[passwordField.text dataUsingEncoding:NSUTF8StringEncoding] forKey:kSecValueData];            [update removeObjectForKey:kSecClass];#if TARGET_IPHONE_SIMULATOR// 模拟器的都有个默认的组“test”，删了，不然会出错            [update removeObjectForKey:(id)kSecAttrAccessGroup];#endif// 得到要修改的item，根据result，但要添加class            NSMutableDictionary* updateItem = [NSMutableDictionary dictionaryWithDictionary:result];            [updateItem setObject:[query objectForKey:(id)kSecClass] forKey:(id)kSecClass];// SecItemUpdate            OSStatus status = SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)update);            NSLog(@"update:%ld",status);

- (IBAction)del:(id)sender {if (nameField.text.length >0) {// 删除的条件        NSDictionary* query = [NSDictionary dictionaryWithObjectsAndKeys:kSecClassGenericPassword,kSecClass,                                nameField.text,kSecAttrAccount,nil];// SecItemDelete        OSStatus status = SecItemDelete((CFDictionaryRef)query);        NSLog(@"delete:%ld",status);    // //  errSecItemNotFound 就是没有    }}