Cocos2D scoring game [duplicate] - objective-c

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Closed 10 years ago.
Possible Duplicate:
Scoring System In Cocos2D
I got a reply from a question I asked earlier but I am new to coding and have no idea how to do it. Here is the reply:
"#synthesize a "score" property of type int, and a "scoreLabel" property of type CCLabelTTF.
initialize your score property to "0" in -(void)init
On line 126, increment your "score" property by 1, and set that value into your CCLabelTTF."
Can you tell me how to do this? plz. link to my other post
----- Scoring System In Cocos2D

Answer 1

When you synthesize a private variable (other classes cannot see it) you allow a way for other classes to see and/or modify the value of that variable.
First, you want to create the variable:
NSMutableArray *_targets;
NSMutableArray *_projectiles;
int _score;
CCLabelTTF *_scoreLabel;
Then in your init method to set the _score to 0:
-(id) init
{
if( (self=[super init] )) {
[self schedule:#selector(update:)];
_score = 0;
Then increment (add 1 to) your _score variable and set the string (the text content) of your _scoreLabel to that value.
if (CGRectIntersectsRect(projectileRect, targetRect)) {
[targetsToDelete addObject:target];
_score++;
[_scoreLabel setString:[NSString stringWithFormat:#"%d", _score]];
}
The line [_scoreLabel setString:[NSString stringWithFormat:#"%d", _score]]; is a way to convert the integer of _score to a string (NSString). It's an old C way of doing it, the %d means that whatever is going to be there should be displayed as an integer as opposed to a float (having decimal points).
It also looks like you need to "instantiate" your label and add it as a child to the layer. Instantiation is just a fancy term for creating a instance of something. Think of a "class" as a blueprint for a chair, and an "instance" as a chair created from that blueprint. Once you have the chair created (an instance), you can modify it (paint it, add/remove legs, etc).
So, to instantiate your label and add it to the layer (itself):
-(id) init
{
if( (self=[super init] )) {
[self schedule:#selector(update:)];
_score = 0;
//Create label
_scoreLabel = [CCLabelTTF labelWithString:#"0" fontName:#"Marker Felt" fontSize:16];
//Add it to a layer (itself)
[self addChild:_scoreLabel];

Answer 2

Create a score property in HelloWorldLayer.h after the interface declaration, like
#property (nonatomic, retain) int score;
Then synthesize it in your .m file just after the #implementation HelloWorldLayer line.
Create methods for setting and getting scores:
-(int)getScore {
return self.score;
}
-(void)setScore:(int)newScore {
self.score = newScore;
}
In the init method, set the value of the property to zero,
if( (self=[super init] )) {
//... other stuff
[self setScore:0]
}
You can update the score with the setScore method, but I suggest having another method for this that calls setScore so that you can use it at different places with a single line call, and make any changes like assigning more score in certain situations, like two collisions within half-a-second etc..
-(void)updateScore:(int)increment {
int currentScore = [self getScore];
[self setScore:(currentScore + increment)];
}
Similarly, for label,
#property (nonatomic, retain) CCLabelTTF scoreLabel; // in header
and
#synthesize scoreLabel; // in .m file
Again, in your init method, initialize the label with position, layer and initial text etc. Then you can update that text in the updateScore method.
-(void)updateScore:(int)increment {
int currentScore = [self getScore];
[self setScore:(currentScore + increment)];
[scoreLabel setString:[NSString stringWithFormat:#"Score: %i", [self getScore]]];
}
Make sure you read through the tutorial before going ahead in order to avoid confusion regarding common tasks.