Preference for open in Chrome or Safari

gistfile1.m

#define kBrowserPref @"browserPref"

- (IBAction)openInBrowserButtonPressed:(id)sender {
  
    NSString *myURL = nil; // put however you get the URL here
  
    // can we open in Chrome?
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"googlechrome:"]]) {

        // let's check the preference
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        if (![defaults stringForKey:kBrowserPref]) {
          
            // no preference chosen, so present the option
            UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Open in Safari", @"Open in Chrome", nil];
            [actionSheet showInView:self.view];
          
        } else if ([[defaults stringForKey:kBrowserPref] isEqualToString:@"chrome"]) {
          
            // they want Chrome, so give them Chrome!
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"googlechrome://%@", myURL]]];
            
        } else {
          
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@", myURL]]];
          
        }
      
    } else {
      
        // can't open in Chrome, so just use Safari
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@", myURL]]];
      
    }

}


- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

    NSString *myURL = nil; // put however you get the URL here

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSURL *url = nil;

    if (buttonIndex == 0) {
        url = [NSURL URLWithString:[NSString stringWithFormat:@"googlechrome://%@", myURL]];
        [defaults setValue:@"chrome" forKey:kBrowserPref];
    } else {
        url = [NSURL URLWithString:[NSString stringWithFormat:@"%@", myURL]];
        [defaults setValue:@"safari" forKey:kBrowserPref];
    }

    [defaults synchronize];
    [[UIApplication sharedApplication] openURL:url];

}