Check if an URL has got http:// prefix

Question

In my application, when the user add an object, can also add a link for this object and then the link can be opened in a webView.
I tried to save a link without http://

Answer 1

You can use the - (BOOL)hasPrefix:(NSString *)aString method on NSString to see if an NSString containing your URL starts with the http:// prefix, and if not add the prefix.

NSString *myURLString = @"www.google.com";
NSURL *myURL;
if ([myURLString.lowercaseString hasPrefix:@"http://"]) {
    myURL = [NSURL URLWithString:myURLString];
} else {
    myURL = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@",myURLString]];
}

I'm currently away from my mac and can't compile/test this code, but I believe the above should work.