How to see if an NSString starts with a certain other string?

Swift version:

if line.hasPrefix("#") {
  // checks to see if a string (line) begins with the character "#"
}

I like to use this method:

if ([[temp substringToIndex:4] isEqualToString:@"http"]) {
  //starts with http
}

or even easier:

if ([temp hasPrefix:@"http"]) {
    //do your stuff
}

Try this: if ([myString hasPrefix:@"http"]).

By the way, your test should be != NSNotFound instead of == NSNotFound. But say your URL is ftp://my_http_host.com/thing, it'll match but shouldn't.

If you're checking for "http:" you'll probably want case-insensitive search:

NSRange prefixRange = 
    [temp rangeOfString:@"http" 
                options:(NSAnchoredSearch | NSCaseInsensitiveSearch)];
if (prefixRange.location == NSNotFound)