iPhone SDK: Check validity of URLs with NSURL not working?

Question

I\'m trying to check if a given URL is valid and i\'m doing it like this:

- (BOOL)urlIsValid:(NSString *)address {
    NSURL *testURL = [NSURL URLWithString:         


        

Answer 1

In my experience, the NSURL creation routines usually throw an exception instead of returning nil. However, the real question in this case is what constitutes a malformed URL? Are you checking whether a resource exists, or checking whether the structure of the string conforms to the relevant RFCs?

With regards to the first issue I mentioned, when creating URLs that I don't manually enter myself I usually do this:

@try
{
    NSURL * url = [NSURL URLWithString: theString];
    // use the URL
}
@catch (NSException * e)
{
    NSLog( @"URL creation error? %@ - %@", [e name], [e reason] );
    @throw;  // throw the exception again, to hopefully get your attention
}