how to sort an NSArray of float values?

Question

I have an NSArray like this:

how to sort NSarray float with value like this:122.00,45.00,21.01,5.90

How do u store floats in a NSArray? – vikingosegundo Sep 30 '11 at 12:45 — vikingosegundo, Sep 30 '11 at 12:45
btw: Your floats are ordered — descending. – vikingosegundo Sep 30 '11 at 13:52 — vikingosegundo, Sep 30 '11 at 13:52

score 11 · Answer 1 · edited Sep 30 '11 at 13:08

11

try this it work for me

NSArray *array=[[NSArray alloc] initWithObjects:[NSNumber numberWithFloat:12.01],[NSNumber numberWithFloat:13.01],[NSNumber numberWithFloat:10.01],[NSNumber numberWithFloat:2.01],[NSNumber numberWithFloat:1.5],nil];
NSArray *sorted = [array sortedArrayUsingSelector:@selector(compare:)];

edited Sep 30 '11 at 13:08

vikingosegundo

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answered Sep 30 '11 at 12:48

Rahul Juyal

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score 11 · Accepted Answer · edited May 23 '17 at 12:08

@Ron's answer is perfect, but I want to add sorting by using an comparator block. For this trivial case it might be overkill, but it is very handy when it comes to sorting of objects in respect to several properties

NSArray *myArray =[NSArray arrayWithObjects: [NSNumber numberWithFloat:45.0],[NSNumber numberWithFloat:122.0], [NSNumber numberWithFloat:21.01], [NSNumber numberWithFloat:5.9], nil];
NSArray *sortedArray = [myArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    if ([obj1 floatValue] > [obj2 floatValue])
        return NSOrderedDescending;
    else if ([obj1 floatValue] < [obj2 floatValue])
        return NSOrderedAscending;
    return NSOrderedSame;
}];

Shrey · Answer 3 · 2019-05-23T09:07:14.730

0

Here... use NSSortDescriptor

First Convert the float values into NSNumber

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"floatValue"
                                              ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray;
sortedArray = [drinkDetails sortedArrayUsingDescriptors:sortDescriptors];

Hope it helps :)

edited May 23 '19 at 09:07

answered Sep 30 '11 at 12:33

Shrey

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i tried it but it can't work. NSNumber not tried ,thanks for reply – Chirag S Sep 30 '11 at 12:35
have u changed float to NSNumber? – Shrey Sep 30 '11 at 12:36
1

Indeed this won't work. NSNumber isn't key value coding compliant to @"floats". try @"floatValue" instead. – vikingosegundo Sep 30 '11 at 13:38

how to sort an NSArray of float values?

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