ios - Trying to allow only certain strings into the URL bar -

to sum up, have browser in app, , want launch 5 websites, nothing else. there way can make browser launch 5 websites setting customs strings, if {user types string in} go , else {do not load}

here code have url part

- (void)viewdidload { [super viewdidload]; // additional setup after loading view nib.  // go google.com nsurl *urlrequest = [nsurl urlwithstring:@"http://www.google.com"]; nsurlrequest *request = [nsurlrequest requestwithurl:urlrequest];  // set text bar urlbar.text = [urlrequest absolutestring];  // load request [webview loadrequest:request];  // show loading icon [[uiapplication sharedapplication] setnetworkactivityindicatorvisible:yes]; } 

and sorry if not in detail, or if missing something, beginner this.

here additional code had

- (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil: (uinavigationcontroller *)navigationcontroller: (controller *)transmission { self = [super initwithnibname:nibnameornil bundle:nibbundleornil]; if (self) {     // custom initialization     self.controller = navigationcontroller;     self.libtransmission = transmission; } return self; }  - (ibaction)go:(id)sender {  // create url request nsurl *urlrequest = [nsurl urlwithstring:urlbar.text]; nsurlrequest *request = [nsurlrequest requestwithurl:urlrequest];  // load request [webview loadrequest:request];  // make network icon visible [[uiapplication sharedapplication] setnetworkactivityindicatorvisible:yes]; } - (void)webviewdidfinishload:(uiwebview *)webview {  // update urlbar urlbar.text = webview.request.url.absolutestring;  // make loading icon disappear [[uiapplication sharedapplication] setnetworkactivityindicatorvisible:no]; }  - (bool)textfieldshouldreturn:(uitextfield *)textfield { [textfield resignfirstresponder]; return yes; }  - (void)didreceivememorywarning { [super didreceivememorywarning]; // dispose of resources can recreated. } 

put sites can accessed array, , go through array see if string typed in in array, this

nsarray *sites = @[@"http://test.com", @"http://test1.com", @"http://test2.com", @"http://test3.com", @"http://test4.com"]; nsstring *urltoopen = urltextfield.text; (nsstring *str in sites){     if ([urltoopen isequaltostring:str]){         nsurl *urlrequest = [nsurl urlwithstring:urltoopen];         nsurlrequest *request = [nsurlrequest requestwithurl:urlrequest];         urlbar.text = [urlrequest absolutestring];         [webview loadrequest:request];      }     else{         //url user entered not 1 of 5 urls     } }