How to find out if the NSURL is a directory or not

Question

I have a NSURL object. It has address of a filesystem element, it is either a file or a directory. I want to be able to tell if the NSURL is a directory or a file.

I

Answer 1

If you know the file URL has been standardized, then you can test for a trailing slash.

-URLByStandardizingPath will standardize a file URL including ensuring a trailing slash if the path is a directory.

Here is a test which shows -URLByStandardizingPath adding the trailing slash:

// Get a directory, any directory will do
NSURL *initialURL = [[NSBundle mainBundle] bundleURL];
NSString *initialString = [initialURL absoluteString];

// String the trailing slash off the directory
NSString *directoryString = [initialString substringToIndex:[initialString length] - 1];
NSURL *directoryURL = [NSURL URLWithString:directoryString];

XCTAssertFalse([[directoryURL absoluteString] hasSuffix:@"/"],
               @"directoryURL should not end with a slash");

XCTAssertTrue([[[directoryURL URLByStandardizingPath] absoluteString] hasSuffix:@"/"],
              @"[directoryURL URLByStandardizingPath] should end with a slash");

As you can see, [[[directoryURL URLByStandardizingPath] absoluteString] hasSuffix:@"/"] is the test.