Parsing in order with rangeOfString: - objective-c

Question

The issue I have is that I want to parse strings in order, so for instance, parsing "one three two", adding that to another string, and printing "one three two". I'm using rangeOfString:, but when I parse that string, it returns "one two three". I know that the order of parsing in my case is the placement of the if statements, but how do I parse that string in order? Here is my code:
NSString *string = #"one three two";
NSString *newString;
if ([string rangeOfString:#"one"].location != NSNotFound)
{
newString = [newString stringByAppendingString:#"one"];
}
if ([string rangeOfString:#"two"].location != NSNotFound)
{
newString = [newString stringByAppendingString:#"two"];
}
if ([string rangeOfString:#"three"].location != NSNotFound)
{
newString = [newString stringByAppendingString:#"three"];
}
NSLog(#"%#",newString);

Answer 1

You are doing this wrong, you should use componentsSeparatedByString: and sorting:
NSString *stringWithNumbersOrdered(NSString *input)
{
static NSArray *numberStrings = nil;
if (!numberStrings)
{
numberStrings = [NSArray arrayWithObjects:#"zero", #"one", #"two", #"three", #"four", #"five", #"six", #"seven", #"eight", #"nine", /* etc. */ nil];
}
NSArray *components = [input componentsSeparatedByString:#" "];
NSArray *componentsSorted = [components sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
int value1 = [numberStrings indexOfObject:obj1];
int value2 = [numberStrings indexOfObject:obj2];
return value1 - value2;
}];
return [componentsSorted componentsJoinedByString:#" "];
}