Call method with keyValueCoding (setValue:forKeyPath:)

Question

I'm stuck with a little problem:

Player *player1;
Player *player2;
Player *player3;
Player *player4;

Inside Player class, I have a variable called, score. If I need to change all players score, I use this function:

for (int i = 1; i <= 4; i++)
{
    [self setValue:@"10,000" forKeyPath: [NSString stringWithFormat: @"player%i.score.text", i]];
}

Also in the Player class, I have a method called changeScorePosition. I would like to call this method for all "Players" in the game. How do I do this?

I didn't understand, what is your actual requiement, can you please explain ? — Midhun MP, Aug 14 '12 at 20:08
Thanks for response. I edit the question, to explain better. — BlackMouse, Aug 14 '12 at 20:17

score 1 · Answer 1 · answered Aug 14 '12 at 20:23

1

Is player1 a global variable?

Instead, try creating an object to manage all players. This object could then easily iterate through all the players and update their score.

answered Aug 14 '12 at 20:23

bbarnhart

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score 1 · Answer 2 · answered Aug 14 '12 at 20:24

You can put the players in an array and then call the correct player based on index using i (although it would need to start at 0).

NSArray *players = [NSArray arrayWithObjects: player1, player2, player3, player4, nil];


for (int i = 0; i < 4; i++)
{
  Player *currentPlayer = (Player *)[players objectAtIndex:i];
  // do whatever with your player here
}

score 1 · Answer 3 · edited May 23 '17 at 10:24

It's better to create number of player like this,

NSMutableArray *playerArray = [[NSMutableArray alloc] init];

for (int i = 1; i <= 4; i++)
{
    Player *player = [{Player alloc] init];
    [playerArray addObject:player];
    [player release];
}

And call the methods like,

for (int i = 1; i <= 4; i++)
{
    [self setValue:@"10,000" forKeyPath: [NSString stringWithFormat: @"player%i.score.text", i]];
    [[playerArray  objectAtIndex:i-1] changeScorePosition];
}

Refer this link: access objective-c object by string name or variable

score 0 · Answer 4 · answered Aug 14 '12 at 20:33

0

Thanks for the help. I change to code some, and found that I can do this:

[[self valueForKeyPath:[NSString stringWithFormat:@"player%i", i]] performSelector:@selector(playerDeclined)];

answered Aug 14 '12 at 20:33

BlackMouse

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Call method with keyValueCoding (setValue:forKeyPath:)

4 Answers4