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I Need to Sort out an array of custom objects.

The object is simple, it stores an x and y co-ordinate, for example: 

XYPointObject.xCoordinate = [NSNumber];
XYPointObject.yCoordinate = [NSNumber];

I have an array that stores up to 676 of these objects that I need to sort into a numerical order as in x values in numerical order, and the y values connected to the x values in order as well. for example, if the input co-ordinates are:

23,5 | 
5,7 | 
1,4 | 
1,7 | 
21,8 | 
9,12 | 
16,19

the sorted array would have the order

1,4 | 1,7 | 5,7 | 9,12 | 16,19 | 23,5

keep in mind the max x,y co-ordinants are 25 (25,25)

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2 Answers

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Did you even take a look at the documentation?

Here's the method that you need:

-[NSArray sortedArrayUsingComparator:]
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Use:

NSSortDescriptor *xSorter = [[NSSortDescriptor alloc] initWithKey:@"xCoordinate" ascending:YES];
NSSortDescriptor *ySorter = [[NSSortDescriptor alloc] initWithKey:@"yCoordinate" ascending:YES];
NSArray *sortedArray=[array sortedArrayUsingDescriptors:@[xSorter,ySorter]];
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