NSMutableArray+MoveObject.m

   1 //
   2 //  NSMutableArray+MoveObject.m
   3 //  Enjoyable
   4 //
   5 //  Created by Joe Wreschnig on 3/7/13.
   6 //
   7 //
   8
   9 #import "NSMutableArray+MoveObject.h"
  10
  11 @implementation NSMutableArray (MoveObject)
  12
  13 - (void)moveObjectAtIndex:(NSUInteger)src toIndex:(NSUInteger)dst {
  14     id obj = self[src];
  15     [self removeObjectAtIndex:src];
  16     [self insertObject:obj atIndex:dst > src ? dst - 1 : dst];
  17 }
  18
  19 - (BOOL)moveFirstwards:(id)object upTo:(NSUInteger)minIndex {
  20     NSUInteger idx = [self indexOfObject:object];
  21     if (idx > minIndex && idx != NSNotFound) {
  22         [self exchangeObjectAtIndex:idx withObjectAtIndex:idx - 1];
  23         return YES;
  24     } else {
  25         return NO;
  26     }
  27 }
  28
  29 - (BOOL)moveLastwards:(id)object upTo:(NSUInteger)maxIndex {
  30     maxIndex = MIN(self.count - 1, maxIndex);
  31     NSUInteger idx = [self indexOfObject:object];
  32     if (idx < maxIndex && idx != NSNotFound) {
  33         [self exchangeObjectAtIndex:idx withObjectAtIndex:idx + 1];
  34         return YES;
  35     } else {
  36         return NO;
  37     }
  38 }
  39
  40 - (BOOL)moveFirstwards:(id)object {
  41     return [self moveFirstwards:object upTo:0];
  42 }
  43
  44 - (BOOL)moveLastwards:(id)object {
  45     return [self moveLastwards:object upTo:NSNotFound];
  46 }
  47
  48
  49 @end