iOS: UIWebView

Assuming that IBOutlet urlTxtField and webViewToLoad
NSString *urlToLoad = [NSString stringWithString : @"http://www.google.com"];
[self.webViewToLoad loadRequest : [NSURLRequest requestWithURL : [NSURL URLWithString : urlToLoad]]];
[urlTxtField setText : urlToLoad];

// assume button IBAction
[urlTxtField resignFirstResponder]; //dismiss keyboard
[self.webViewToLoad loadRequest : [NSURLRequest requestWithURL : [NSURL URLWithString : urlTxtField.text]]];