Not seeing tabs when I used the SLPagingViewController inside a ViewController

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I have an iOS app where ViewController is the default view controller. The implementation of ViewController looks like this

#import "ViewController.h"
#import "SLPagingViewController.h"
#import "UIColor+SLAddition.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

- (void)viewDidAppear:(BOOL)animated {
    UIColor *orange = [UIColor colorWithRed:255/255
                                      green:69.0/255
                                       blue:0.0/255
                                      alpha:1.0];

    UIColor *gray = [UIColor colorWithRed:.84
                                    green:.84
                                     blue:.84
                                    alpha:1.0];

    UIImage *img1 = [UIImage imageNamed:@"gear"];
    img1 = [img1 imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

    UIImage *img2 = [UIImage imageNamed:@"profile"];
    img2 = [img2 imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

    UIImage *img3 = [UIImage imageNamed:@"chat"];
    img3 = [img3 imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

    NSArray *titles = @[[[UIImageView alloc] initWithImage:img1], [[UIImageView alloc] initWithImage:img2], [[UIImageView alloc] initWithImage:img3]];

    UIView *orangeView = [self viewWithBackground:[UIColor orangeColor]];

    UIView *yellowView = [self viewWithBackground:[UIColor yellowColor]];

    UIView *blueView = [self viewWithBackground:[UIColor blueColor]];

    NSArray *views = @[orangeView, yellowView, blueView];


    SLPagingViewController *pageViewController = [[SLPagingViewController alloc] initWithNavBarItems:titles
                                                                                    navBarBackground:[UIColor whiteColor]
                                                                                               views:views
                                                                                     showPageControl:NO];


    pageViewController.navigationSideItemsStyle = SLNavigationSideItemsStyleOnBounds;
    float minX = 45.0;
    // Tinder Like
    pageViewController.pagingViewMoving = ^(NSArray *subviews){
        float mid  = [UIScreen mainScreen].bounds.size.width/2 - minX;
        float midM = [UIScreen mainScreen].bounds.size.width - minX;
        for(UIImageView *v in subviews){
            UIColor *c = gray;
            if(v.frame.origin.x > minX
               && v.frame.origin.x < mid)
                // Left part
                c = [UIColor gradient:v.frame.origin.x
                                  top:minX+1
                               bottom:mid-1
                                 init:orange
                                 goal:gray];
            else if(v.frame.origin.x > mid
                    && v.frame.origin.x < midM)
                // Right part
                c = [UIColor gradient:v.frame.origin.x
                                  top:mid+1
                               bottom:midM-1
                                 init:gray
                                 goal:orange];
            else if(v.frame.origin.x == mid)
                c = orange;
            v.tintColor= c;
        }
    };



    [pageViewController setNavigationBarColor:[UIColor greenColor]];

    [self presentViewController:pageViewController animated:YES completion:nil];
}

-(UIView*)viewWithBackground:(UIColor *)color{
    UIView *v = [UIView new];
    v.backgroundColor = color;
    return v;
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

However, with the above code, the orange, yellow and blue views fill the whole screen and the tabs are not visible. How do I make the tabs visible?