How to sort an NSArray with integers elements ?

 Its very very simple.

NSMutableArray *heightArray=[[NSMutableArray alloc]init];
for(int i=0; i<10; i++)
{
     float value=(rand()%100.0)/10;
     [heightArray addObject:[NSNumber numberWithFloat:value]];
}
NSArray *sortedArray = [heightArray sortedArrayUsingSelector:@selector(compare:)];

//Lets print the sorted Array

NSLog(@"sortedArray=%@",sortedArray);

For sorting an array which contains  instance of custom class. You can check this old post.