NSRange给出了荒谬的位置

Question

I'm experiencing this weird effect where calling location on rangeOfString is returning a very large value when it shouldn't...

my code looks like this:

NSRange range = [string rangeOfString:subString];
NSLog(@"range is %@", NSStringFromRange(range));

this logs out to range is {2147483647, 0}

Can't figure out why exactly.

Some things that might be causing this:

• The substring is generated from an array of bytes using NSString's initWithBytes method
• The substring tells me its an NSCFString * but also says 'variable is not NSString'
• the substring logs in the console as expected

any help greatly appreciated

here is somethign that is striking me as weird:

Answer 1

That just means that your substring is not present in your string, do the following to verify this:

NSRange range = [string rangeOfString:subString];
if (range.location == NSNotFound) {
  NSLog(@"String not found");
} else {
  NSLog(@"range is %@", NSStringFromRange(range));
}