Game Development Reference
In-Depth Information
Listing 4-11. CoinsController.m (createAndLayoutImages)
-(void)createAndLayoutImages{
int rowCount = [coinsGame rowCount];
int colCount = [coinsGame colCount];
CGRect coinsFrame = [coinsView frame];
float width = coinsFrame.size.width/colCount;
float height = coinsFrame.size.height/rowCount;
for (int r=0;r<rowCount;r++){
for (int c=0;c<colCount;c++){
UIImageView* imageView = [[UIImageView alloc] init];
CGRect frame = NnCGRectMake(c*width, r*height, width, height);
[imageView setFrame:frame];
[coinsView addSubview: imageView];
[self spinCoinAt:CoordMake(r, c)];
}
}
frame
of
coinsView
is stored in the variable
coinsFrame
for easy reference, and
width
and
height
of each coin view is calculated. The two for loops create an
imageView
, set its
frame
, and add it to
coinsView
for each row and column. In the nested loops,
spinCoinAt:
is called,
which creates the spinning coin effect. Note that the argument being passed to
spinCoinAt:
is the
result of the function
CoordMake
. We will take a look at this function and the class
CoinsGame
after
looking at
spinCoinAt:
, shown in Listing 4-12.
Listing 4-12. CoinsController.m (spinCoinAt:)
-(void)spinCoinAt:(Coord)coord{
UIImageView* coinView = [[coinsView subviews] objectAtIndex:[coinsGame indexForCoord:coord]];
NSNumber* coin = [coinsGame coinForCoord:coord];
NSArray* images = [imageSequences objectAtIndex:[coin intValue]];
[coinView setAnimationImages: images];
NSTimeInterval interval = (random()%4)/10.0+.6;
[coinView setAnimationDuration: interval];
[coinView startAnimating];
}
You can see that
spinCoinAt:
takes an argument of type
Coord
. This is defined in
CoinsGame.h
and
is a struct that represents a coin at a particular row and column. In the first line of this task, the
struct
Coord
is used to find the index of the
UIView
that represents this particular coin. This works
because there is exactly one
UIImageView
for each coin. (This was set up in Listing 4-11.) After the
correct
UIImageView
is found, we get the value of the coin from the
coinsGame
object. The
NSNumber
coin
represents the type of coin for this particular set of coordinates—either a triangle, square, or
circle. Using the
intValue
of the
coin
, we pull out an
NSArray
from
imageSequences
called
images
.
