SecItemDelete sample

SecItemDelete sample

- (void)removeObjectForKey:(NSString*)key {
#if !TARGET_IPHONE_SIMULATOR
	@synchronized(self) {
		if (!deleteQueryDictionary) {
			deleteQueryDictionary = [[NSMutableDictionary alloc]initWithObjectsAndKeys:
									 (id)kSecClassGenericPassword, (id)kSecClass,
									 key, (id)kSecAttrAccount,
									 (id)kSecMatchLimitAll, (id)kSecMatchLimit,
									 (id)kCFBooleanTrue, (id)kSecReturnAttributes,
									 nil];
		} else {
			[deleteQueryDictionary setObject:key forKey:(id)kSecAttrAccount];
		}
		NSArray *itemList = nil;
		OSStatus osStatus = SecItemCopyMatching((CFDictionaryRef)deleteQueryDictionary, (CFTypeRef *)&itemList);
		if (osStatus == noErr) {
			for (NSDictionary *item in itemList) {
				NSMutableDictionary *query = [item mutableCopy];
				[query setValue:(id)kSecClassGenericPassword forKey:(id)kSecClass];
				osStatus = SecItemDelete((CFDictionaryRef)query);
				if (osStatus != noErr) {
					NSLog(@"osStatus:%d",osStatus);
				}
				[query release];
			}
		} else if (osStatus != errSecItemNotFound){
			NSLog(@"osStatus:%d",osStatus);
		}
		[itemList release];
	}
#else
	[[NSUserDefaults standardUserDefaults] removeObjectForKey:key];
#endif
}