Edit AllPages

Hi all. The addition of [NSTable selectedRowIndexes] has frustrated many, particularly when trying to run through the set and do something with each index at a time. Well that time has come to an end.

Code: With comments.

//Lets create a mutable index set because we’re going to have to edit the set as we loop through it NSMutableIndexSet *mutableIndexSet = [[[NSMutableIndexSet alloc] init] autorelease]; //Add the indexes you would like to loop through, to the mutable index set [mutableIndexSet addIndexes:[myTable selectedRowIndexes]];

//Start us off with a loop int a; for(a=0;a<[mutableIndexSet count];a++) { //Lets grab the first index of the set int cIndex = [mutableIndexSet firstIndex]; //cIndex is the current index of the loop!!

//Do something wild and fantastic with your index, like accessing an object from an array! Woooo NSString *itemFromArray = [myArray objectAtIndex:cIndex];

//Now lets remove the current index from the set, so that the next time this loop runs the first index is actually the next index in the set [mutableIndexSet removeIndex:cIndex];

//But, you’ll find that the original count of the index set will soon mismatch. So you must tell the loop to loop one less time each time an index is removed. a = a-1; }

Pretty cool huh?

Code: For those who wanna jump right in. (No comments) cIndex is the object that represents the current index of the loop

NSMutableIndexSet *mutableIndexSet = [[[NSMutableIndexSet alloc] init] autorelease]; [mutableIndexSet addIndexes:[myTable selectedRowIndexes]];

int a; for(a=0;a<[mutableIndexSet count];a++) { int cIndex = [mutableIndexSet firstIndex]; NSString *itemFromArray = [myArray objectAtIndex:cIndex]; [mutableIndexSet removeIndex:cIndex]; a = a-1; }

I have created a new class, LKEasyIndex that you can use to create a new array from another array based on an index set. This seems to be the most wanted.

– Louis Klaassen

Wouldn’t it be easier to use NSArray’s objectsAtIndexes: method?