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CustomizableTabBar.swift
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CustomizableTabBar.swift
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//
// CustomizableTabBar.swift
// GamingList
//
// Created by jonathan.gomes<jonathangomes.ti@gmail.com> on 08/12/20.
//
import UIKit
@IBDesignable
class CustomizableTabBar: UITabBar {
@IBInspectable var customBackgroundColor: UIColor? {
didSet {
configTabBar()
}
}
@IBInspectable var buttonsOnly: Bool = false {
didSet {
configTabBar()
}
}
@IBInspectable var buttonsPaddingX: CGFloat = 0 {
didSet {
configTabBar()
}
}
@IBInspectable var buttonsPaddingY: CGFloat = 0 {
didSet {
configTabBar()
}
}
@IBInspectable var radius: CGFloat = 0 {
didSet {
configTabBar()
}
}
@IBOutlet var contentView: UIView?
private let bgView: UIView = {
let bgView = UIView()
bgView.translatesAutoresizingMaskIntoConstraints = false
return bgView
}()
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func draw(_ rect: CGRect) {
self.configTabBar()
}
func configTabBar() {
self.backgroundImage = UIImage()
self.shadowImage = UIImage()
self.backgroundColor = .clear
self.bgView.backgroundColor = customBackgroundColor
addDefaultBackgroundView()
if let contentView = contentView{
contentView.removeFromSuperview()
bgView.addSubview(contentView)
contentView.translatesAutoresizingMaskIntoConstraints = false
bgView.addConstraints([
NSLayoutConstraint(item: contentView, attribute: .bottom, relatedBy: .equal, toItem: bgView, attribute: .bottom, multiplier: 1, constant: 0),
NSLayoutConstraint(item: contentView, attribute: .top, relatedBy: .equal, toItem: bgView, attribute: .top, multiplier: 1, constant: 0),
NSLayoutConstraint(item: contentView, attribute: .leading, relatedBy: .equal, toItem: bgView, attribute: .leading, multiplier: 1, constant: 0),
NSLayoutConstraint(item: contentView, attribute: .trailing, relatedBy: .equal, toItem: bgView, attribute: .trailing, multiplier: 1, constant: 0)
])
}
self.setNeedsDisplay()
}
fileprivate func addDefaultBackgroundView() {
bgView.removeFromSuperview()
bgView.layer.cornerRadius = radius
bgView.layer.masksToBounds = true
self.addSubview(bgView)
if let containerView = self.superview {
if buttonsOnly {
var buttonsWidth:CGFloat = 0
var minX: CGFloat = CGFloat.greatestFiniteMagnitude
var maxX: CGFloat = 0
var buttonsHeight = self.frame.height
for itemView in self.subviews {
if String(describing: type(of: itemView)) == "UITabBarButton" {
buttonsHeight = itemView.frame.height
if itemView.frame.maxX > maxX {
maxX = itemView.frame.maxX
}
if itemView.frame.minX < minX {
minX = itemView.frame.minX
}
buttonsWidth = maxX-minX
}
}
containerView.addConstraints([
NSLayoutConstraint(item: bgView, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0),
NSLayoutConstraint(item: bgView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 0),
NSLayoutConstraint(item: bgView, attribute: .height, relatedBy: .equal, toItem: .none, attribute: .notAnAttribute, multiplier: 1, constant: buttonsHeight + buttonsPaddingY),
NSLayoutConstraint(item: bgView, attribute: .width, relatedBy: .equal, toItem: .none, attribute: .notAnAttribute, multiplier: 1, constant: buttonsWidth + buttonsPaddingX)
])
} else {
containerView.addConstraints([
NSLayoutConstraint(item: bgView, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1, constant: 0),
NSLayoutConstraint(item: bgView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 0),
NSLayoutConstraint(item: bgView, attribute: .leading, relatedBy: .equal, toItem: self, attribute: .leading, multiplier: 1, constant: 0),
NSLayoutConstraint(item: bgView, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1, constant: 0)
])
}
}
self.sendSubviewToBack(bgView)
}
}