iPhone - archiving array of custom objects
- by Dylan
I've been trying for hours and I cannot solve this problem.
I'm making an app that saves unfinished Chess Games, so I'm trying to write an array to a file.
This is what the array is, if it makes sense:
-NSMutableArray savedGames
--GameSave a
---NSMutableArray board;
----Piece a, b, c, etc.
-----some ints
---NSString whitePlayer, blackPlayer;
---int playerOnTop, turn;
--GameSave b
---NSMutableArray board;
----Piece a, b, c, etc.
-----some ints
---NSString whitePlayer, blackPlayer;
---int playerOnTop, turn;
etc.
And these are my NSCoding methods:
GameSave.m
- (void)encodeWithCoder:(NSCoder *)coder {
[coder encodeObject:whitePlayer forKey:@"whitePlayer"];
[coder encodeObject:blackPlayer forKey:@"blackPlayer"];
[coder encodeInt:playerOnTop forKey:@"playerOnTop"];
[coder encodeInt:turn forKey:@"turn"];
[coder encodeObject:board forKey:@"board"];
}
- (id)initWithCoder:(NSCoder *)coder {
self = [[GameSave alloc] init];
if (self != nil)
{
board = [coder decodeObjectForKey:@"board"];
whitePlayer = [coder decodeObjectForKey:@"whitePlayer"];
blackPlayer = [coder decodeObjectForKey:@"blackPlayer"];
playerOnTop = [coder decodeIntForKey:@"playerOnTop"];
turn = [coder decodeIntForKey:@"turn"];
}
return self;
}
Piece.m
- (void)encodeWithCoder:(NSCoder *)coder {
[coder encodeInt:color forKey:@"color"];
[coder encodeInt:piece forKey:@"piece"];
[coder encodeInt:row forKey:@"row"];
[coder encodeInt:column forKey:@"column"];
}
- (id)initWithCoder:(NSCoder *)coder {
self = [[Piece alloc] init];
if (self != nil)
{
color = [coder decodeIntForKey:@"color"];
piece = [coder decodeIntForKey:@"piece"];
row = [coder decodeIntForKey:@"row"];
column = [coder decodeIntForKey:@"column"];
}
return self;
}
And this is the code that tries to archive and save to file:
- (void)saveGame {
ChessSaverAppDelegate *delegate = (ChessSaverAppDelegate *) [[UIApplication sharedApplication] delegate];
[[delegate gameSave] setBoard:board];
NSMutableArray *savedGames = [NSKeyedUnarchiver unarchiveObjectWithFile:[self dataFilePath]];
if (savedGames == nil) {
[NSKeyedArchiver archiveRootObject:[delegate gameSave] toFile:[self dataFilePath]];
} else {
[savedGames addObject:[delegate gameSave]];
[NSKeyedArchiver archiveRootObject:savedGames toFile:[self dataFilePath]];
}
}
- (NSString *)dataFilePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:@"gameSaves.plist"];
}
Sorry, here's the problem:
After setting some breakpoints, an error is reached after this line from -saveGame:
[NSKeyedArchiver archiveRootObject:savedGames toFile:[self dataFilePath]];
And this is what shows up in the console:
2010-05-11 17:04:08.852 ChessSaver[62065:207] *** -[NSCFType encodeWithCoder:]: unrecognized selector sent to instance 0x3d3cd30
2010-05-11 17:04:08.891 ChessSaver[62065:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFType encodeWithCoder:]: unrecognized selector sent to instance 0x3d3cd30'
2010-05-11 17:04:08.908 ChessSaver[62065:207] Stack: (
32339035,
31077641,
32720955,
32290422,
32143042,
238843,
25827,
238843,
564412,
342037,
238843,
606848,
17686,
2733061,
4646817,
2733061,
3140430,
3149167,
3144379,
2837983,
2746312,
2773089,
41684313,
32123776,
32119880,
41678357,
41678554,
2777007,
9884,
9738
)
If it matters, -saveGame is called from a UIBarButton in a navigation controller.
Any help is appreciated, thanks.
