UIWebView How to get correct URL? - ios

Question

I am making a simple web browser by using UIWebView. User enters an address on the address bar -> check it.
1.If the text is url -> load the request
2.If the text is string -> perform a google search
In the first case, if string has the format: abc.xyz, how to add a scheme and host to it?
Example: user enters google.com -> correct to https://google.com
engadget.com -> https://www.engadget.com.
My problem is how to know which part had to add to url(http, https, with or without www).
Update:
use NSURLSeassion to test connect
- (void)checkRequest:(NSString*)urlRequest
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlRequest]];
[request setHTTPMethod:#"HEAD"];
NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
if (statusCode == 200)
NSLog(#"Correct url");
// check status code here
}
if (error) {
// handle other errors here
}
// handle data here
}];
[task resume];
}
Update 2
Don't need to check url, add http:// scheme and website will automatically redirect to the correct destination.

Answer 1

in your case i think you need to perform a HEAD request and check the result.
For example, with your sample url http://engadget.com. if it response not exists, add www to this url and try again.
NSMutableURLRequest request = [NSMutableURLRequest requestWithURL:inURL];
[request setHTTPMethod:#"HEAD"];
NSURLConnection connection = [NSURLConnection connectionWithRequest:request delegate:self];
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
if ([(NSHTTPURLResponse *)response statusCode] == 200) {
// url exists
}
}