NSIndexSet indexGreaterThanIndex
- (NSUInteger)indexGreaterThanIndex:(NSUInteger)index
Parameters
index
Index being inquired about.
Return Value of [NSIndexSet indexGreaterThanIndex]
Closest index in the index set greater than index; NSNotFound when the index set contains no qualifying index.
NSIndexSet indexGreaterThanIndex example.
int indexIwantToFind = 2;
int valueAtThisIndex = [aSet firstIndex];
for(int i = 0; i < indexIwantToFind; i++){
valueAtThisIndex = [aSet indexGreaterThanIndex:valueAtThisIndex];
}
NSLog(@"%d", valueAtThisIndex); //This will give you 39
int valueAtThisIndex = [aSet firstIndex];
for(int i = 0; i < indexIwantToFind; i++){
valueAtThisIndex = [aSet indexGreaterThanIndex:valueAtThisIndex];
}
NSLog(@"%d", valueAtThisIndex); //This will give you 39
Example of [NSIndexSet indexGreaterThanIndex].
I believe NSIndexSet stores its indexes using ranges, so there isn't necessarily a quick way to return the nth index. You could enumerate keeping a counter until your counter reaches your target index:
NSUInteger index = [indexSet firstIndex];
for (NSUInteger i = 0, target = 4; i < target; i++)
index = [indexSet indexGreaterThanIndex:index];
That should give you the 4th index. You could even add the method as a category method if you want:
- (NSUInteger)indexAtIndex:(NSUInteger)anIndex
{
if (anIndex >= [self count])
return NSNotFound;
NSUInteger index = [indexSet firstIndex];
for (NSUInteger i = 0; i < anIndex; i++)
index = [self indexGreaterThanIndex:index];
return index;
}
NSUInteger index = [indexSet firstIndex];
for (NSUInteger i = 0, target = 4; i < target; i++)
index = [indexSet indexGreaterThanIndex:index];
That should give you the 4th index. You could even add the method as a category method if you want:
- (NSUInteger)indexAtIndex:(NSUInteger)anIndex
{
if (anIndex >= [self count])
return NSNotFound;
NSUInteger index = [indexSet firstIndex];
for (NSUInteger i = 0; i < anIndex; i++)
index = [self indexGreaterThanIndex:index];
return index;
}
NSIndexSet indexGreaterThanIndex example.
/*int (as commented, unreliable across different platforms)*/
NSUInteger currentIndex = [someIndexSet firstIndex];
while (currentIndex != NSNotFound)
{
//use the currentIndex
//increment
currentIndex = [someIndexSet indexGreaterThanIndex: currentIndex];
}
NSUInteger currentIndex = [someIndexSet firstIndex];
while (currentIndex != NSNotFound)
{
//use the currentIndex
//increment
currentIndex = [someIndexSet indexGreaterThanIndex: currentIndex];
}
