CustomTab.m

//
//  CustomTab.m
//
//  Created by z5ottu Szloboda Zsolt on 10/02/16.
//  Copyright © 2016 z5 tech. All rights reserved.
//
// compatibility: ios8, ios9

#import <Foundation/Foundation.h>
#import "CustomTab.h"


@interface CustomTab ()
@end

@implementation CustomTab
@synthesize tabBar;

#define UIColorFromRGB(rgbValue) [UIColor \
colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \
green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \
blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.delegate = self;
    
    [UITabBar appearance].tintColor = [UIColor whiteColor];
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]} forState:UIControlStateNormal];
    
    UIImage* lightBackground = [self imageFromColor:UIColorFromRGB(0xabcc58) setwidth:tabBar.frame.size.width setheight:tabBar.frame.size.height];
    [tabBar setBackgroundImage:lightBackground];
    
    
    UIImage* darkImage = [self imageFromColor:UIColorFromRGB(0x829d3c) setwidth:tabBar.frame.size.width/tabBar.items.count setheight:tabBar.frame.size.height];
    [tabBar setSelectionIndicatorImage:darkImage];
    
    for (UITabBarItem *item in tabBar.items){
        if (item.image != nil){
            CGRect rect = CGRectMake(0, 0, item.image.size.width, item.image.size.height);
            UIGraphicsBeginImageContext(rect.size);
            CGContextRef context = UIGraphicsGetCurrentContext();
            CGContextClipToMask(context, rect, item.image.CGImage);
            CGContextSetFillColorWithColor(context, [[UIColor whiteColor] CGColor]);
            CGContextFillRect(context, rect);
            UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            
            item.image = [[UIImage imageWithCGImage:img.CGImage
                                              scale:1.0 orientation: UIImageOrientationDownMirrored] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
            
        }
    }
}

- (BOOL)tabBarController:(UITabBarController *)tabBarController
shouldSelectViewController:(UIViewController *)viewController{
    NSUInteger index = [[tabBarController viewControllers] indexOfObject:viewController];
    
    if (index >0){
        return true;
    }else{
        return true;
    }
}

- (UIImage *)imageFromColor:(UIColor *)color setwidth:(CGFloat)width setheight:(CGFloat)height {
    CGRect rect = CGRectMake(0, 0, width, height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

@end