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Asked: 2026-05-11T12:05:43+00:00

Problem: I have a set of images, lets say 5. There is an structure

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Problem: I have a set of images, lets say 5. There is an structure that defines an ‘image object’ in the meaning of my context.

Every such image object has this information:

  • name, of the image file (ie ‘myImage.png’)
  • xOffsetPx
  • yOffsetPx
  • width
  • height

The images are supposed to be shown on very specific positions in an view, so I need to store all this information in some sort of multidimensional associative array (or similar). The name of the image would be the key or ID.

I stumbled upon something like that a month ago in my 1000 pages objective-c book, but can’t find it anymore. Any idea here?

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1 Answer

  1. The most simple way would be to just use a dictionary:

    NSMutableDictionary *images;  NSDictionary *myPictureAttributes = [NSDictionary dictionaryWithObjects:     [NSArray arrayWithObjects:[NSNumber numberWithFloat:30],                               [NSNumber numberWithFloat:10],                               [NSNumber numberWithFloat:15],                               [NSNumber numberWithFloat:15], nil],     forKeys:[NSArray arrayWithObjects:@'xOffsetPx',                               @'yOffsetPx',                               @'width',                               @'height', nil]]; [images setObject:myPictureAttributes forKey:@'myImage.png'];

    You would probably want your attributes to be constants of some kind so that compiler can warn you if you make a spelling error. You could also have a simple data object class with a few properties on it, then set those and add the object directly to the dictionary. There are a number of other ways to solve this problem, depending on your exact requirements, but NSDictionary is the basic collection class in Cocoa for associative arrays.

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