NSMutableDictionary - Adjusting name to load an image

[marshusensei]

Hello again!

I have a question, not sure the best way to word it. I'm trying to find a way to load a thumbnail version of an image that is set in a NSMutableDictionary.

In the NSMutableDictionary, I have:

@"test_image.jpg", @"image"

This is then called in the customise cell section:

    [[cell imageView] setImage:[UIImage imageNamed:[[[data objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"image"]]];

I would like it to load an image called

test_image_thumb.jpg

Is there a way I can add "_thumb.jpg" to the key?

Hmm, maybe this is too confusing.

[Domele]

You'll need to separate the image name using componentsSeparatedByString. Then use stringWithFormat to add "_thumb"

NSArray *imageNameComponents = [imageName componentsSeparatedByString:@"."];
NSString *thumbImageName = [NSString stringWithFormat:%@_thumb.%@", [imageNameComponents objectAtIndex:0], [imageNameComponents objectAtIndex:1]];

This code assumes you don't have any dots in your file names except for the file type. Also code is untested and method names are from memory so they might be off.

[marshusensei]

Thanks Domelle!

I didn't think anyone would understand what I was trying to say, but you did! Thanks very much.

[Duncan C]

Originally Posted by Domele

You'll need to separate the image name using componentsSeparatedByString. Then use stringWithFormat to add "_thumb"

NSArray *imageNameComponents = [imageName componentsSeparatedByString:@"."];
NSString *thumbImageName = [NSString stringWithFormat:%@_thumb.%@", [imageNameComponents objectAtIndex:0], [imageNameComponents objectAtIndex:1]];

This code assumes you don't have any dots in your file names except for the file type. Also code is untested and method names are from memory so they might be off.

Domele's approach would work, but it would be "fragile". If the input filename included more than one period, it would not give the expected result. If it contained no periods, it would crash.

There are actually NSString methods specifically designed for dealing with file system paths. I would suggest using those instead:

NSString* firstPart = [imageName stringByDeletingPathExtension];
NSString* extension = [imageName pathExtension];
NSString *thumbImageName = [NSString stringWithFormat: "%@_thumb.%@", 
  firstPart, extension];

[Domele]

Oh wow, I never knew those methods existed. Thanks for the info, I'll be using those methods from now on.