我花了将近几个小时才弄明白。然而，这并没有发生，最后，我不得不来到这里。 需要实现两件事：
首先，我想在 UITabbar 的顶部（基本上是 TopRight 和 TopLeft）有一个自发的 圆角半径。
其次，我想在这些圆角半径上方有一个阴影（如下图所示）。
如果我有任何进一步的要求，请告诉我，我一定会提供的。
任何帮助将不胜感激。
编辑 1
这里又出现了一个小问题，假设，即使我们能够做到这一点，Apple 审核团队会接受该申请吗？ 我有点紧张和好奇。
【问题讨论】：
标签： swift uitabbar rounded-corners xcode10 cornerradius
问：这里又出现了一个小问题，假设，即使我们能够做到这一点，Apple 审核团队会接受该申请吗？ 答：是的，他们接受您的应用我添加了这种类型的 TabBar。
创建自定义标签栏
HomeTabController
import UIKit
class HomeTabController: UITabBarController
{
var viewCustomeTab : CustomeTabView!
var lastSender : UIButton!
//MARK:- ViewController Methods
override func viewDidLoad()
{
super.viewDidLoad()
UITabBar.appearance().shadowImage = UIImage()
allocateTabItems()
}
//MARK:- Prepare Methods
// Allocate shop controller with tab bar
func allocateTabItems()
{
let vc1 = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "Avc") as? Avc
let item1 = UINavigationController(rootViewController: vc1!)
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.viewControllers = [item1]
createTabBar()
}
func createTabBar()
{
viewCustomeTab = CustomeTabView.instanceFromNib()
viewCustomeTab.translatesAutoresizingMaskIntoConstraints = false
viewCustomeTab.call()
self.view.addSubview(viewCustomeTab)
if #available(iOS 11, *)
{
let guide = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([guide.bottomAnchor.constraint(equalToSystemSpacingBelow: viewCustomeTab.bottomAnchor, multiplier: 0), viewCustomeTab.leadingAnchor.constraint(equalToSystemSpacingAfter: guide.leadingAnchor, multiplier: 0), guide.trailingAnchor.constraint(equalToSystemSpacingAfter: viewCustomeTab.trailingAnchor, multiplier: 0), viewCustomeTab.heightAnchor.constraint(equalToConstant: 70) ])
}
else
{
let standardSpacing: CGFloat = 0
NSLayoutConstraint.activate([viewCustomeTab.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor, constant: standardSpacing), bottomLayoutGuide.topAnchor.constraint(equalTo: viewCustomeTab.bottomAnchor, constant: standardSpacing)
])
}
viewCustomeTab.btnTab1.addTarget(self, action: #selector(HomeTabController.buttonTabClickAction(sender:)), for: .touchUpInside)
viewCustomeTab.btnTab2.addTarget(self, action: #selector(HomeTabController.buttonTabClickAction(sender:)), for: .touchUpInside)
viewCustomeTab.btnTab3.addTarget(self, action: #selector(HomeTabController.buttonTabClickAction(sender:)), for: .touchUpInside)
viewCustomeTab.btnTab4.addTarget(self, action: #selector(HomeTabController.buttonTabClickAction(sender:)), for: .touchUpInside)
viewCustomeTab.btnTab5.addTarget(self, action: #selector(HomeTabController.buttonTabClickAction(sender:)), for: .touchUpInside)
//self.view.layoutIfNeeded()
viewCustomeTab.layoutIfNeeded()
viewCustomeTab.btnTab1.alignContentVerticallyByCenter(offset: 3)
viewCustomeTab.btnTab2.alignContentVerticallyByCenter(offset: 3)
viewCustomeTab.btnTab3.alignContentVerticallyByCenter(offset: 3)
viewCustomeTab.btnTab4.alignContentVerticallyByCenter(offset: 3)
viewCustomeTab.btnTab5.alignContentVerticallyByCenter(offset: 3)
viewCustomeTab.btnTab1.isSelected = true
}
//MARK:- Button Click Actions
//Manage Tab From Here
func setSelect(sender:UIButton)
{
viewCustomeTab.btnTab1.isSelected = false
viewCustomeTab.btnTab2.isSelected = false
viewCustomeTab.btnTab3.isSelected = false
viewCustomeTab.btnTab4.isSelected = false
viewCustomeTab.btnTab5.isSelected = false
sender.isSelected = true
}
@objc func buttonTabClickAction(sender:UIButton)
{
//self.selectedIndex = sender.tag
if sender.tag == 0
{
let vc1 = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "Bvc") as? Bvc
let item1 = UINavigationController(rootViewController: vc1!)
item1.navigationBar.isHidden = false
self.viewControllers = [item1]
setSelect(sender: viewCustomeTab.btnTab1)
return
}
if sender.tag == 1
{
let vc2 = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "Cvc") as? Cvc
let item2 = UINavigationController(rootViewController: vc2!)
item2.navigationBar.isHidden = false
item2.navigationBar.isTranslucent = false
self.viewControllers = [item2]
setSelect(sender: viewCustomeTab.btnTab2)
return
}
if sender.tag == 2
{
let vc3 = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "Dvc") as? Dvc
let item3 = UINavigationController(rootViewController: vc3!)
item3.navigationBar.isHidden = false
item3.navigationBar.isTranslucent = false
self.viewControllers = [item3]
setSelect(sender: viewCustomeTab.btnTab3)
return
}
if sender.tag == 3
{
}
if sender.tag == 4
{
}
}
}
Create Custom View For Shadow Effect and For + Button.
import UIKit
class CustomeTabView: UIView
{
@IBOutlet weak var btnTab5: UIButton!
@IBOutlet weak var btnTab4: UIButton!
@IBOutlet weak var btnTab3: UIButton!
@IBOutlet weak var btnTab2: UIButton!
@IBOutlet weak var btnTab1: UIButton!
@IBOutlet weak var vRadius: UIView!
class func instanceFromNib() -> CustomeTabView
{
return UINib(nibName: "CustomeTabView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! CustomeTabView
}
private var shadowLayer: CAShapeLayer!
override func layoutSubviews()
{
super.layoutSubviews()
let shadowSize : CGFloat = 2.0
let shadowPath = UIBezierPath(roundedRect: CGRect(x: -shadowSize / 2, y: -shadowSize / 2, width: self.vRadius.frame.size.width, height: self.vRadius.frame.size.height), cornerRadius : 20)
self.vRadius.layer.masksToBounds = false
self.vRadius.layer.shadowColor = UIColor.black.cgColor
self.vRadius.layer.shadowOffset = CGSize.zero//(width: self.vRadius.frame.size.width, height: self.vRadius.frame.size.height)
self.vRadius.layer.shadowOpacity = 0.5
self.vRadius.layer.shadowPath = shadowPath.cgPath
self.vRadius.layer.cornerRadius = 20
}
【讨论】：
您可以通过一些带有自定义标签栏控制器的自定义视图来实现这一点。您可以通过仅编辑自定义视图来自定义颜色和阴影。
import UIKit
class MainTabBarController: UITabBarController{
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
tabBar.backgroundImage = UIImage.from(color: .clear)
tabBar.shadowImage = UIImage()
let tabbarBackgroundView = RoundShadowView(frame: tabBar.frame)
tabbarBackgroundView.cornerRadius = 25
tabbarBackgroundView.backgroundColor = .white
tabbarBackgroundView.frame = tabBar.frame
view.addSubview(tabbarBackgroundView)
let fillerView = UIView()
fillerView.frame = tabBar.frame
fillerView.roundCorners([.topLeft, .topRight], radius: 25)
fillerView.backgroundColor = .white
view.addSubview(fillerView)
view.bringSubviewToFront(tabBar)
}
import UIKit
class RoundShadowView: UIView {
let containerView = UIView()
override init(frame: CGRect) {
super.init(frame: frame)
layoutView()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func layoutView() {
// set the shadow of the view's layer
layer.backgroundColor = UIColor.clear.cgColor
layer.shadowColor = UIColor.black.cgColor
layer.shadowOffset = CGSize(width: 0, height: -8.0)
layer.shadowOpacity = 0.12
layer.shadowRadius = 10.0
containerView.layer.cornerRadius = cornerRadius
containerView.layer.masksToBounds = true
addSubview(containerView)
containerView.translatesAutoresizingMaskIntoConstraints = false
// pin the containerView to the edges to the view
containerView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
containerView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
containerView.topAnchor.constraint(equalTo: topAnchor).isActive = true
containerView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
}
}
import UIKit
extension UIImage {
static func from(color: UIColor) -> UIImage {
let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
UIGraphicsBeginImageContext(rect.size)
let context = UIGraphicsGetCurrentContext()
context!.setFillColor(color.cgColor)
context!.fill(rect)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img!
}
}
【讨论】：
要添加任何半径或形状，您可以使用 UIBezierPath。我放置的示例具有带半径的左右角，您可以根据需要使用更多可设计的个性化设置。
@IBDesignable class TabBarWithCorners: UITabBar {
@IBInspectable var color: UIColor?
@IBInspectable var radii: CGFLoat = 15.0
private var shapeLayer: CALayer?
override func draw(_ rect: CGRect) {
addShape()
}
private func addShape() {
let shapeLayer = CAShapeLayer()
shapeLayer.path = createPath()
shapeLayer.strokeColor = UIColor.gray.withAlphaComponent(0.1).cgColor
shapeLayer.fillColor = color?.cgColor ?? UIColor.white.cgColor
shapeLayer.lineWidth = 1
if let oldShapeLayer = self.shapeLayer {
layer.replaceSublayer(oldShapeLayer, with: shapeLayer)
} else {
layer.insertSublayer(shapeLayer, at: 0)
}
self.shapeLayer = shapeLayer
}
private func createPath() -> CGPath {
let path = UIBezierPath(
roundedRect: bounds,
byRoundingCorners: [.topLeft, .topRight],
cornerRadii: CGSize(width: radii, height: 0.0))
return path.cgPath
}
}
【讨论】：
Swift 5.3.1、XCode 11+、iOS 14 用于情节提要：
import UIKit
class CustomTabBar: UITabBar {
override func awakeFromNib() {
super.awakeFromNib()
layer.masksToBounds = true
layer.cornerRadius = 20
layer.maskedCorners = [.layerMinXMinYCorner,.layerMaxXMinYCorner]
}
}
【讨论】：