sorting an array of object with respect to the float value

Question

im working with a project , where i receive an array of object, each object has a description of type string, and a value of type CGfloat. i need to sort them by value increasingly, and store them in a dicitonary. i tried this solution, but it didn't work. How do I sort an NSMutableArray with custom objects in it? any idea how to do it?

for (PNPieChartDataItem *item in items) {// didnt work
NSArray *sortedArray;
        sortedArray = [items sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
            CGFloat first = [(PNPieChartDataItem*)a value];
            CGFloat second = [(PNPieChartDataItem*)b value];
            return [first compare:second];
        }];


        }

Should it be `CGfloat *first` or `CGfloat first` ? – NeverHopeless May 11 '18 at 07:40 — NeverHopeless, May 11 '18 at 07:40

score 0 · Answer 1 · answered May 11 '18 at 08:15

0

You don't need a for loop, sortedArrayUsingComparator iterates on values to compare:

NSArray *sortedArray = [items sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
            CGFloat first = [(PNPieChartDataItem*)a value];
            CGFloat second = [(PNPieChartDataItem*)b value];
            return [first compare:second];
        }];
}

Use sortedArray.

answered May 11 '18 at 08:15

NeverHopeless

11,077
4
35
56

`CGFloat` is not an object, so one wouldn't call methods on it. – David Rönnqvist May 11 '18 at 08:21
im getting an error bar receiver type 'cgfloat' (aka 'double') at the return line – May 11 '18 at 08:29
what is the type of `value` ? Try changing `CGFloat` to `double`. – NeverHopeless May 11 '18 at 09:19

sorting an array of object with respect to the float value

1 Answers1

Linked