BaseTabBarController.h

//
//  BaseTabBarController.h
//  WeCareWealthManagement
//
//  Created by Leo Cavalcante on 24/07/17.
//  Copyright © 2017 Kiddo. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface BaseTabBarController : UITabBarController
@property (nonatomic, getter=isTabBarHidden,readonly)BOOL tabBarHidden;

- (void)setTabBarHidden:(BOOL)hidden animated:(BOOL)animated;

@end

BaseTabBarController.m

//
//  BaseTabBarController.m
//  WeCareWealthManagement
//
//  Created by Leo Cavalcante on 24/07/17.
//  Copyright © 2017 Kiddo. All rights reserved.
//

#import "BaseTabBarController.h"


@interface BaseTabBarController () <UITabBarControllerDelegate>


@end

@implementation BaseTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    self.delegate = self;
    [[UITabBar appearance] setShadowImage:[[UIImage alloc] init]];
    [[UITabBar appearance] setBackgroundImage:[[UIImage alloc] init]];
    self.tabBar.barTintColor = [UIColor whiteColor];
    self.tabBar.tintColor = [UIColor blackColor];
    
    UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.tabBar.frame.size.width, 1)];
    line.backgroundColor = [UIColor groupTableViewBackgroundColor];
    [self.tabBar addSubview:line];
    
}


#pragma mark - Animation on ViewController switch
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
    
    NSUInteger controllerIndex = [self.viewControllers indexOfObject:viewController];
    
    if (viewController == [tabBarController selectedViewController]) {
        if ([viewController isKindOfClass:[UINavigationController class]]) {
            [(UINavigationController*)viewController popToRootViewControllerAnimated:YES];
        }
        return NO;
    }
    
    // Get the views.
    UIView *fromView = tabBarController.selectedViewController.view;
    UIView *toView = [tabBarController.viewControllers[controllerIndex] view];
    [fromView.superview addSubview:toView];
    
    
    UIViewController *fromViewVC = [tabBarController.selectedViewController childViewControllers][0];
    UIViewController *toViewVC = [viewController childViewControllers][0];
    
    
    BOOL scrollRight = controllerIndex > tabBarController.selectedIndex;
    
    // Position it off screen.
    CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width / 2 ;
    
    
    [toViewVC.view setTransform:CGAffineTransformMakeTranslation((scrollRight ? screenWidth : -screenWidth), 0)];
    fromViewVC.view.center = CGPointMake(fromViewVC.view.center.x, fromViewVC.view.center.y);
    toViewVC.view.alpha = 0.1;
    [UIView animateWithDuration:0.3
                          delay:0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         
                         fromViewVC.view.center = CGPointMake(fromViewVC.view.center.x - (scrollRight ? screenWidth-100 : -screenWidth+100), fromViewVC.view.center.y);
                         
                         [toViewVC.view setTransform:CGAffineTransformMakeTranslation(0, 0)];
                         toViewVC.view.alpha = 1;
                     }
     
                     completion:^(BOOL finished) {
                         if (finished) {
                             
                             [toViewVC.view setTransform:CGAffineTransformMakeTranslation(0, 0)];
                             [fromViewVC.view setTransform:CGAffineTransformMakeTranslation(0, 0)];
                             // Remove the old view from the tabbar view.
                             [fromView removeFromSuperview];
                             tabBarController.selectedIndex = controllerIndex;
                         }
                     }];
    
    return NO;
}




#pragma mark - Hide TabBar
- (BOOL)isTabBarHidden{
    CGRect viewFrame = self.view.frame;
    CGRect tabBarFrame = self.tabBar.frame;
    return tabBarFrame.origin.y >= viewFrame.size.height;
}

- (void)setTabBarHidden:(BOOL)hidden animated:(BOOL)animated {
    BOOL isHidden = self.tabBarHidden;
    if (hidden == isHidden) {
        return;
    }
    
    UIView *transitionView = [[[self.view.subviews reverseObjectEnumerator] allObjects] lastObject];
    if(transitionView == nil) {
        NSLog(@"could not get the container view!");
        return;
    }
    CGRect viewFrame = self.view.frame;
    CGRect tabBarFrame = self.tabBar.frame;
    CGRect containerFrame = transitionView.frame;
    tabBarFrame.origin.y = viewFrame.size.height - (hidden ? 0 : tabBarFrame.size.height);
    containerFrame.size.height = viewFrame.size.height - (hidden ? 0 : tabBarFrame.size.height);
    
    if (animated) {
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.35];
    }
    self.tabBar.frame = tabBarFrame;
    transitionView.frame = containerFrame;
    if (animated) {
        [UIView commitAnimations];
    }
    
}









@end