Question

I’ve just whittled out loads of erros and now my code compiles fine, however it always crashes in the createEntity method i made. there is seemingly nothing wrong with it, but could someone help me anyway? Anything to suggest?

 -(void)createEntityWithX:(int)newEntityX andY:(int)newEntityY withType:(int)newEntityType withWidth:(int)newEntityWidth andLength:(int)newEntityLength atSpeed:(int)newEntitySpeed
{
  Entity tmpEntity;
  tmpEntity.entityX = newEntityX;
  tmpEntity.entityY = newEntityY;
  tmpEntity.entityLength = newEntityLength;
  tmpEntity.entityWidth = newEntityWidth;
  tmpEntity.entityType = newEntityType;
  tmpEntity.entitySpeed = newEntitySpeed;

  int arrayAmount = [entityArray count];
  NSValue *tmp = [NSValue valueWithBytes:&tmpEntity objCType:@encode(struct Entity)];

  [entityArray insertObject:tmp atIndex:arrayAmount];

  [tmp release];
}

Answer 1

One or both of two things is wrong here. It’s possible that entityArray is not an NSMutableArray, but an NSArray, in which case you’re getting an “unrecognized selector” error.

After that’s fixed, you need to fix your indexing. You can’t insert an object into an NSMutableArray at the index corresponding to its count, because the last valid index for insertion is count-1. You should use addObject: to put something at the end of the array:

NSValue *tmp = [NSValue valueWithBytes:&tmpEntity objCType:@encode(struct Entity)];

[entityArray addObject:tmp];