[Custom TabBar] customizing UITabBarController #tabbar #swift3 #ui

customTabBar.swift

import UIKit

class RootVC: UITabBarController {
  
  //MARK: - Propertise
  
  let selectedColor = UIColor(red: 238 / 255.0, green: 110 / 255.0, blue: 115 / 255.0, alpha: 1)
  let unselectedColor = UIColor(red: 37 / 255.0, green: 37 / 255.0, blue: 37 / 255.0, alpha: 1)
  
  //MARK: - Life cycle
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    let numberOfItems = CGFloat(tabBar.items!.count)
    
    let tabBarItemSize = CGSize(width: tabBar.frame.width / numberOfItems,
                                height: tabBar.frame.height)
    
    tabBar.selectionIndicatorImage = UIImage.imageWithColor(color: unselectedColor, size: tabBarItemSize).resizableImage(withCapInsets: .zero)
    
    tabBar.frame.size.width = self.view.frame.width + 4
    tabBar.frame.origin.x = -2
    
    tabBar.barTintColor = UIColor.white
    tabBar.tintColor = selectedColor
    
    UITabBar.appearance().layer.borderWidth = 0.0
    UITabBar.appearance().clipsToBounds = true
    
        self.view.insertSubview(tabBar.shadowView(color: .black, radius: 3, opacity: 0.2, offset: CGSize(width: 0, height: -2)), belowSubview: tabBar)
    
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    for item in self.tabBar.items! {
      item.image = item.selectedImage!.with(color: unselectedColor).withRenderingMode(.alwaysOriginal)
      item.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)
    }
  }
}