UITabBarController Customization 1. UITabBar Shift to Top of the Screen, 2.Add Custome Bottom Border, 3. Add Left to Right swipe effect

AppDelegate

//Add Below code to App Delegate .m file
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    [[UITabBar appearance] setShadowImage:[[UIImage alloc]init]];
    
    [[UITabBarItem appearance] setTitleTextAttributes:@{
                                                        NSFontAttributeName:[UIFont fontWithName:@"Helvetica-Bold" size:14.0f],NSForegroundColorAttributeName : [Utility getUIColorFromHexString:INACTIVE_TAB_TEXT_COLOR]
                                                        } forState:UIControlStateNormal];
    
    [[UITabBarItem appearance] setTitleTextAttributes:@{
                                                        NSFontAttributeName:[UIFont fontWithName:@"Helvetica-Bold" size:14.0f],NSForegroundColorAttributeName : [UIColor whiteColor]
                                                        } forState:UIControlStateSelected];
    
    [[UITabBar appearance] setBarTintColor:[Utility getUIColorFromHexString:BACKGROUND_PRIMARY_COLOR]];

    
    [[UINavigationBar appearance] setTitleTextAttributes:
     [NSDictionary dictionaryWithObjectsAndKeys:
      [UIColor whiteColor], NSForegroundColorAttributeName,
      [UIFont fontWithName:@"Helvetica-Bold" size:20.0], NSFontAttributeName,nil]];
    
    return YES;
}

UITabBarController

//Add Below code to .h file
#import <UIKit/UIKit.h>

@interface TabControllerViewController : UITabBarController <UITabBarControllerDelegate>

@end
  
  //Start .M File ***************
  
 //Add Below Code to .m file 
 #import "TabControllerViewController.h"
#import "AppConstants.h"
#import "Utility.h"
#import "ViewController.h"
#import "RetailBranchesViewController.h"

@interface TabControllerViewController (){
    UIView *bottomMainView,*bottomBorderView;
}

@end

@implementation TabControllerViewController

int i;

static int BOTTOM_BORDER_HEIGHT = 3;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.delegate = self;
    
    
    
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//Set tab bar bottom to top with custom border
- (void)viewWillLayoutSubviews
{
    [super viewWillLayoutSubviews];
    
    i++;
    NSLog(@"Call viewWillLayoutSubviews: %d",i);
    
    if(i <= 1){
        [self.tabBar invalidateIntrinsicContentSize];
        
        CGFloat tabSize = 50.0;
        
        UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
        
        if (UIInterfaceOrientationIsLandscape(orientation))
        {
            tabSize = 35.0;
        }
        
        CGRect tabFrame = self.tabBar.frame;
        
        tabFrame.size.height = tabSize;
        
        tabFrame.origin.y = self.view.frame.origin.y - 65;
        
        self.tabBar.frame = tabFrame;
        
        // Set the translucent property to NO then back to YES to
        // force the UITabBar to reblur, otherwise part of the
        // new frame will be completely transparent if we rotate
        // from a landscape orientation to a portrait orientation.
        
        
        bottomMainView = [[UIView alloc]initWithFrame:CGRectMake(0, self.tabBar.frame.size.height - 3, self.tabBar.frame.size.width, BOTTOM_BORDER_HEIGHT)];
        [bottomMainView setBackgroundColor:[Utility getUIColorFromHexString:BACKGROUND_PRIMARY_COLOR]];
        
        bottomBorderView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.tabBar.frame.size.width / 2, BOTTOM_BORDER_HEIGHT)];
        [bottomBorderView setBackgroundColor:[UIColor whiteColor]];
        
        [bottomMainView addSubview:bottomBorderView];
        
        
        bottomBorderView.layer.masksToBounds = NO;
        bottomBorderView.layer.shadowOffset = CGSizeMake(0, 1);
        bottomBorderView.layer.shadowRadius = 2;
        bottomBorderView.layer.shadowOpacity = 0.5;
        
        [self.tabBar addSubview:bottomMainView];
        
    }
}

//Add Swipe Animation Here
- (BOOL)  tabBarController:(UITabBarController *)tabBarController
shouldSelectViewController:(UIViewController *)viewController {
    
    NSString *childClassName = NSStringFromClass([viewController class]);
    NSString *retailClassName = NSStringFromClass([RetailBranchesViewController class]);
    
    // http://stackoverflow.com/questions/5161730/iphone-how-to-switch-tabs-with-an-animation
    NSUInteger controllerIndex = [self.viewControllers indexOfObject:viewController];
    
    if (controllerIndex == tabBarController.selectedIndex) {
        return NO;
    }
    
    // Get the views.
    UIView *fromView = tabBarController.selectedViewController.view;
    UIView *toView = [tabBarController.viewControllers[controllerIndex] view];
    
    // Get the size of the view area.
    CGRect viewSize = fromView.frame;
    BOOL scrollRight = controllerIndex > tabBarController.selectedIndex;
    
    // Add the to view to the tab bar view.
    [fromView.superview addSubview:toView];
    
    // Position it off screen.
    CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
    toView.frame = CGRectMake((scrollRight ? screenWidth : -screenWidth), viewSize.origin.y, screenWidth, viewSize.size.height);
    
    [UIView animateWithDuration:0.5
                          delay:0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         
                         // Animate the views on and off the screen. This will appear to slide.
                         fromView.frame = CGRectMake((scrollRight ? -screenWidth : screenWidth), viewSize.origin.y, screenWidth, viewSize.size.height);
                         toView.frame = CGRectMake(0, viewSize.origin.y, screenWidth, viewSize.size.height);
                         
                         if([childClassName isEqualToString:retailClassName]){
                             CGRect frame = bottomBorderView.frame;
                             frame.origin.x = self.tabBar.frame.size.width / 2;
                             bottomBorderView.frame = frame;
                             bottomBorderView.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.0, 1.0);
                         }else{
                             CGRect frame = bottomBorderView.frame;
                             frame.origin.x = 0;
                             bottomBorderView.frame = frame;
                             bottomBorderView.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.0, 1.0);
                         }
                         
                     }
     
                     completion:^(BOOL finished) {
                         if (finished) {
                             
                             // Remove the old view from the tabbar view.
                             [fromView removeFromSuperview];
                             tabBarController.selectedIndex = controllerIndex;
                         }
                     }];
    
    return NO;
}


/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/