Sort a NSMutableArray by Object values

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How to sort an NSMutableArray with custom objects in it?

Here i am sorting the NSMutableArray newsDataArray containing the NewsData Objects with int property newsID. This is working now . But how can i do this in a better way . Is there any better methods ...

NSSortDescriptor *sortDesc = [[NSSortDescriptor alloc] initWithKey:@"newsID" ascending:NO];
NSArray *tempArray = [newsDataArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDesc]];
NSMutableArray *sortedArray = [NSMutableArray arrayWithArray:tempArray];
NSLog(@"sortedArray=%@" ,sortedArray);

when i am using the following methods with block some error is showing. I want sorted newsDataArray as my final result .... Anyone give me a clear example ...

Check the answer to this question, which gives several means to do so: http://stackoverflow.com/questions/805547/how-to-sort-an-nsmutablearray-with-custom-objects-in-it — Mike Fahy, Dec 10 '11 at 18:35

score 7 · Accepted Answer · edited Oct 07 '14 at 04:02

7

There are several ways, here by using a comparator

For NSArray -> new Array object:

array = [array sortedArrayUsingComparator: ^(id a, id b) {
    return [a.newsTitle compare:b.newsTitle]
}

For NSMutableArray -> in place:

[array sortUsingComparator: ^(id a, id b) {
    return [a.newsTitle compare:b.newsTitle]
}];

Sorting by scalars:

[array sortUsingComparator: ^(id a, id b) {
    if ( a.newsID < b.newsID) {
        return (NSComparisonResult)NSOrderedAscending;
    } else if ( a.newsID > b.newsID) {
        return (NSComparisonResult)NSOrderedDescending;
    } 
    return (NSComparisonResult)NSOrderedSame;
}];

edited Oct 07 '14 at 04:02

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answered Dec 10 '11 at 18:33

vikingosegundo

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want to compare 'newsID' that is an int value ... how can i ... – Sachu Vijay Dec 11 '11 at 08:01
here where i will create my objects a and b ... – Sachu Vijay Dec 11 '11 at 08:24
its saying error ' a and b not found' ... – Sachu Vijay Dec 11 '11 at 08:25
the method `sortUsingComparator:` passes the objects in to the block. If your code is not working, please check the documentation for blocks and these sorting methods. – vikingosegundo Dec 11 '11 at 09:43

Sort a NSMutableArray by Object values

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