This demonstrates how to instantiate and add a portal button to your a view. This uses the SMPortalButton convenience class.

MyViewController.m

#import "SMPortalButton.h"

@implementation MyViewController

- (void)viewDidLoad 
{
  [super viewDidLoad];
  SMPortalButton *portalButton=[SMPortalButton buttonWithType:UIButtonTypeSystem];
  [portalButton.button setTitle:@"Portal Button" forState:UIControlStateNormal];
  portalButton.frame = CGRectMake(40, 40, 100, 30);
  [self.view addSubview:portalButton];
}

@end