Save the data in the system key string. Even if the application is deleted, the data is saved.

@ Interface saveobject: nsobject

// Save data

+ (Void) Save :( nsstring *) Key Data :( ID) data;

// Load data

+ (ID) Load :( nsstring *) Key;

// Delete data

+ (Void) delete :( nsstring *) Key;

@ End

 

 

@ Implementation saveobject

// Obtain data

+ (Nsmutabledictionary *) keychainquery :( nsstring *) Key

{

If (key ){

Return [nsmutabledictionary dictionarywithobjectsandkeys:

(_ Bridge_transfer ID) ksecclassgenericpassword, (_ bridge_transfer ID) ksecclass,

Key, (_ bridge_transfer ID) ksecattrservice,

Key, (_ bridge_transfer ID) ksecattraccount,

(_ Bridge_transfer ID) ksecattraccessibleafterfirstunlock, (_ bridge_transfer ID) ksecattraccessible,

Nil];

}

Return nil;

}

// Save data

+ (Void) Save :( nsstring *) Key Data :( ID) data

{

If (Key & Data! = Nil ){

// Get search dictionary

Nsmutabledictionary * keychainquery = [self keychainquery: Key];

// Delete old item before add new item

Secitemdelete (_ bridge_retained cfdictionaryref) keychainquery );

// Add new object to search Dictionary (Attention: the data format)

[Keychainquery setobject: [nskeyedarchiver archiveddatawithrootobject: Data] forkey :( _ bridge_transfer ID) ksecvaluedata];

// Add item to keychain with the search dictionary

Secitemadd (_ bridge_retained cfdictionaryref) keychainquery, null );

}

}

// Load data

+ (ID) Load :( nsstring *) Key

{

Id ret = nil;

If (key ){

Nsmutabledictionary * keychainquery = [self keychainquery: Key];

// Configure the search setting

[Keychainquery setobject :( ID) kcfbooleantrue forkey :( _ bridge_transfer ID) ksecreturndata];

[Keychainquery setobject :( _ bridge_transfer ID) ksecmatchlimitone forkey :( _ bridge_transfer ID) ksecmatchlimit];

Cfdataref keydata = NULL;

If (secitemcopymatching (_ bridge_retained cfdictionaryref) keychainquery, (cftyperef *) & keydata) = noerr ){

@ Try {

Ret = [nskeyedunarchiver unarchiveobjectwithdata :( _ bridge_transfer nsdata *) keydata];

}

@ Catch (nsexception * E ){

Nslog (@ "unarchive of % @ failed: % @", key, e );

}

@ Finally {}

}

}

Return ret;

}

// Delete data

+ (Void) delete :( nsstring *) Key

{

Nsmutabledictionary * keychainquery = [self keychainquery: Key];

Secitemdelete (_ bridge_retained cfdictionaryref) keychainquery );

}

@ End

Save the data in the system key string. Even if the application is deleted, the data is saved.