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//建立词典,用来传递参数
NSMutableDictionary * dictionary =, [[NSMutableDictionary 字典);
,//设置条目类别,我们用该条目存储普通密码,所以设置成kSecClassGenericPassword
[dictionary setObject: (id) kSecClassGenericPassword forKey: (id) kSecClass];
,//设置条目的id,比如“MyPasswordForFtp",条目id必须时NSDate,而不是NSString
NSString * itemIDString =, @" MyPasswordForFtp";
* itemID=NSData [itemIDString dataUsingEncoding NSUTF8StringEncoding):;
[dictionary setObject: itemIDforKey: (id) kSecAttrGeneric);
,//设置条目所属的服务和账户,为了避免重名,我们使用常见的反转域名规则,比如com.mykeychain.ftppassword
NSString * account =, @" com.mykeychain.ftppassword";
NSString * service =, @" com.mykeychain.ftppassword";
[dictionary setObject: account forKey: (id) kSecAttrAccount];
[dictionary setObject: service forKey: (id) kSecAttrService];
,//设置查询条件,只返回一个条目
[dictionary setObject: (id) kSecMatchLimitOne forKey: (id) kSecMatchLimit];
,//设置查询条件,返回条目存储的数据,(kSecReturnData ==,真的)
[dictionary setObject: (id) kCFBooleanTrue forKey: (id) kSecReturnData];
,//开始查询
NSData * result =,零;
OSStatus status =, SecItemCopyMatching ((CFDictionaryRef) dictionary ,, (CFTypeRef *),结果);
//建立词典,用来传递参数
NSMutableDictionary * dictionary =, [[NSMutableDictionary 字典);
,//设置条目类别,我们用该条目存储普通密码,所以设置成kSecClassGenericPassword
[dictionary setObject: (id) kSecClassGenericPassword forKey: (id) kSecClass];
,//设置条目的id,比如“MyPasswordForFtp",条目id必须时NSDate,而不是NSString
NSString * itemIDString =, @" MyPasswordForFtp";
* itemID=NSData [itemIDString dataUsingEncoding NSUTF8StringEncoding):;
[dictionary setObject: itemIDforKey: (id) kSecAttrGeneric);
,//设置条目所属的服务和账户,为了避免重名,我们使用常见的反转域名规则,比如com.mykeychain.ftppassword
NSString * account =, @" com.mykeychain.ftppassword";
NSString * service =, @" com.mykeychain.ftppassword";
[dictionary setObject: account forKey: (id) kSecAttrAccount];
[dictionary setObject: service forKey: (id) kSecAttrService];
,//设置条目数据,条目数据时NSDate
NSString * password =, @" 123456“;
NSData * itemData =, [password dataUsingEncoding NSUTF8StringEncoding):;
[dictionary setObject: itemData forKey: (id) kSecValueData];
,//添加条目到钥匙链
OSStatus status =, SecItemAdd ((CFDictionaryRef)字典,NULL);
//建立查询字典
NSMutableDictionary * searchDictionary =, [[NSMutableDictionary 字典);
,//设置查询字典
[searchDictionary setObject: (id) kSecClassGenericPassword forKey: (id) kSecClass];
,
NSString * itemIDString =, @" MyPasswordForFtp";
* itemID=NSData [itemIDString dataUsingEncoding NSUTF8StringEncoding):;
[searchDictionary setObject: itemIDforKey: (id) kSecAttrGeneric);
,
NSString * account =, @" com.mykeychain.ftppassword";
NSString * service =, @" com.mykeychain.ftppassword";
[searchDictionary setObject: account forKey: (id) kSecAttrAccount];
[searchDictionary setObject: service forKey: (id) kSecAttrService];
,//,建立更新字典
NSMutableDictionary * updateDictionary =, [[NSMutableDictionary 字典);
,//,设置要更新的新密码
时间=NSString *, newPassword @" 654321“;
NSData * passwordData =, [newPassword dataUsingEncoding NSUTF8StringEncoding):;
[updateDictionary setObject: passwordData forKey: (id) kSecValueData];
,//进行更新
OSStatus status =, SecItemUpdate (searchDictionary (CFDictionaryRef), (CFDictionaryRef) updateDictionary);
