Nil return value from fileURLWithPath

Question

I've recently completed an app-project which mainly consisted of html-files in a webView.

Now I set up another project and copied the relevant code-fragments, but the app crashes with this error message:

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[NSURL initFileURLWithPath:]: nil string parameter'

this is the code:

NSString *path01 = [[NSBundle mainBundle] pathForResource:@"01-a" ofType:@"html" inDirectory:@"htdocs"];
NSURL *url01 = [NSURL fileURLWithPath:path01];
NSURLRequest *request01 = [NSURLRequest requestWithURL:url01];
[webView01 loadRequest:request01];

I guess the problem is the file-reference, but everything is in its place, but the result is always NIL.

I´ve searched for the problem, it seems there is something wrong with how i imported the files to xcode, but i can´t fix it. Is there a simple trick to get xcode to properly import the folder "htdocs"?

thanks in advance...

Answer 1

Make sure the file 01-a.html is copied to your app bundle. This can be achieved via the Copy Files / Copy bundled resources phase when building the app. The crash indicates, that the file is missing from the bundle and thus a nil value is returned. You should do checks for nil in such cases.

Answer 2

NSURL *url01 = [NSURL fileURLWithPath:path01];

The only parameter is path01, so let's see where that comes from

NSString *path01 = [[NSBundle mainBundle] pathForResource:@"01-a" ofType:@"html" inDirectory:@"htdocs"];

That means you don't have a file htdocs/01-a.html in your resources.

Note that xcode flattens resource structure so you probably just want to drop the inDirectory argument.