Quickly Build an Input-Driven Game - Beginning iOS6 Games Development - page 78

[self createAndLayoutImages];
[delegate gameDidStart:self with: coinsGame];
acceptingInput = YES;
}
The task newGame is called when the New Game button is clicked on the Welcome screen. The first
thing to do is remove the old subviews from coinsView . (There may not be any subviews to remove
if the user just launched the application.) The object coinsGame is released before being set to a new
instance prepopulated with random coin values. The next step is to call createAndLayoutImages ,
which will place the coins on the screen. This task is called by both continueGame: and newGame , so
we will look at it after looking at continueGame: . The last thing to do is inform any delegate that a
new game has started and set acceptingInput to YES .
Continuing a Game
If a game was in progress when a user last quit, that user may wish to continue the game from
where it left off. This is done by clicking the Continue button in the Welcome view. When that button
is pressed, the task continueGame is called, which is pretty similar to newGame . Listing 4-10 shows
continueGame: .
Listing 4-10. CoinsController.m (continueGame:)
-(void)continueGame:(CoinsGame*)aCoinsGame{
for (UIView* view in [coinsView subviews]){
[view removeFromSuperview];
}
[coinsGame release];
coinsGame = aCoinsGame;
[self createAndLayoutImages];
[delegate gameDidStart:self with: coinsGame];
acceptingInput = YES;
}
The task continueGame: takes a CoinsGame object as an argument called aCoinsGame . After clearing
away the old subviews of coinsView , we set coinsGame to the passed-in aCoinsGame object. A
call to createAndLayoutImages is made, to add the coins to the scene. We call the delegate task
gameDidStart:coinsGame: so the delegate has a chance to update the UILabel objects that track the
current score and remaining turn. Finally, we set acceptingInput to YES .
Initializing the UIViews for Each Coin
As mentioned, the task createAndLayoutImages is called by both newGame and continueGame: . This
task is responsible for the initial setup of the game, primarily creating a UIImageView for each coin in
the game. This task is shown in Listing 4-11.