How to filter array and let stay only strings end with .png

Question

I am reading files from folder, folder contains .pngs but I get additionally Thumb.db file in every folder and all others are .pngs. I read content as

NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];

How to remove all files which contains .db in array or to stay just which ends with .png ?

This is a relatively trivial task with a `for..in` loop. What have you tried? — Guillaume Algis, Jan 06 '15 at 10:24
possible duplicate of [NSPredicate endswith multiple files](http://stackoverflow.com/questions/5032541/nspredicate-endswith-multiple-files) — Paulw11, Jan 06 '15 at 10:25

score 4 · Answer 1 · answered Jan 06 '15 at 10:26

Idiomatic way of filtering arrays in Cocoa is with NSPredicate:

NSArray *filtered = [directoryContent filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"pathExtension = png"]];

pathExtension method mentioned inside the predicate is a method on NSString that tries to interpret the string as a filesystem path, and return the extension.

Chandu kumar.Alasyam · Accepted Answer · 2015-07-07T08:13:41.397

3

I think by using NSPredicate method you can get exact values

NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];
NSString *str              = @".png"
NSPredicate *sPredicate    = [NSPredicate predicateWithFormat:@"SELF contains[c] %@",str];
NSArray *predicateArray    = [directoryContent filteredArrayUsingPredicate:sPredicate];

edited Jul 07 '15 at 08:13

answered Jan 06 '15 at 10:30

Chandu kumar.Alasyam

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1
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score 0 · Answer 3 · answered Jan 06 '15 at 10:25

0

Try this code:

    NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];
    NSMutableArray *imageArray = [[NSMutableArray alloc] init];

    for (NSString *path in directoryContent) 
    {
       if ([path hasSuffix:@".png"]) 
       {
          [imageArray addObject: path];
       }
    }

    NSLog (@"Number of images : %d" , [imageArray count]);

answered Jan 06 '15 at 10:25

Mrunal

13,474
6
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NSPredicate is a simpler solution – Paulw11 Jan 06 '15 at 10:26
Yes it is, even I didn't know that earlier. – Mrunal Jan 06 '15 at 10:28

How to filter array and let stay only strings end with .png

3 Answers3