Method in Objective-C that points to an object

Method in Objective-C that points to an object

I have created a few sprites using a spriteclass and I have loaded them into an array. In my app, I loop over the array checking for particular conditions (position, etc.). I want to create an explosion method that I can pass one of these objects to and then using the pointer pull the position of the object on the screen and show an explosion there. I don't know how to pass the pointer/object that is in my array to the method to be used.

Here is essentially what I had in mind:

for (int i=1; i<4; i++) {      EnemySprite *currentenemy = [enemies objectAtIndex:i-1];      //Blow this guy up     [self explosion:currentenemy] }   -(void)explosion someobject {      explosion.position = someobject.position      someobject.setHidden=YES;  } 

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You would write it like this for one param.
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// definition -(void) explosion:(EnemySprite*) someObject {  }  // usage [self explosion: object]; 
For two params things are a bit more involved.

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// definition -(void) explosion:(EnemySprite*) someObject radius:(float)explosionRadius {   ... 

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if (pos < explosionRadius) ...

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} // usage [self explosion: object radius:10.0f];
Everything before the : is used for the external name, everything after is the name internal to the function..
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This is why you will often see Objective-C functions written with function names that end with the name of the first type:.
-(void) explodeSprite:(EnemySprite*) sprite radius:(float)radius; 
Both the sprite and radius params then appear to be "named" when the function is written;.
[self explodeSprite:sprite radius:10.0f]; 


Why not make your object the receiver of the explosion?.
for (id currentenemy in enemies) {     [currentenemy explode]; } 

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