Compare method for Sorting an Array

It's pretty simple to write your own comparison method for strings:  @implementation NSString(compare) -(NSComparisonResult)compareNumberStrings:(NSString *)str { NSNumber * me = [NSNumber numberWithInt:[self intValue]]; NSNumber * you = [NSNumber numberWithInt:[str intValue]]; return [you compare:me]; } @end share|edit answered Dec 30 '10 at 0:50 thelaws 2,731819
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up vote17

You should use this method: [arr sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]; in a NSArray or: [arr sortUsingSelector:@selector(caseInsensitiveCompare:)]; in a "inplace" sorting NSMutableArray The comparator should return one of this values: NSOrderedAscending NSOrderedDescending NSOrderedSame    -(NSComparisonResult)compare:(id)anotherObject { NameAndHighScore *that= (NameAndHighScore*)anotherObject; if( this.highScore < that.highScore ) return NSOrderedDescending; if( this.highScore > that.highScore ) return NSOrderedAscending; else return NSOrderedSame; }   static NSComparisonResult compareObjects(id obj1, id obj2, void* context) { int value1 = [obj1 intValue], value2 = [obj2 intValue]; if (value1 < value2) return NSOrderedDescending; if (value1 > value2) return NSOrderedAscending; return NSOrderedSame; }