问题
I've spent almost a couple of hours to figure it out. However, it did not happen and finally, I had to come here. Two things are required to be achieved:
Firstly I'd like to have a spontaneous corner radius at the top (which is basically TopRight & TopLeft) of UITabbar.
Secondly, I'd like to have a shadow above those corner radius(shown in below image).
Please have a look at below image
Let me know if anything further required from my side, I'll surely provide that.
Any help will be appreciated.
Edit 1
One more little question arose here along, suppose, Even if, However, we were able to accomplish this, Would Apple review team accept the application? I'm being little nervous and curious about it.
回答1:
Q : One more little question arose here along, suppose, Even if, However, we were able to accomplish this, Would Apple review team accept the application? A: Yes They are accept your app I have Add This Kind Of TabBar.
Create Custom TabBar
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
}
OpenImg
回答2:
Swift 4.2
You can achieve this with some custom view with a custom tab bar controller. You can customize the colors and shadows by editing only the custom views.
Custom Tab Bar Controller
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)
}
Rounded Shadow View
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
}
}
UIImage extension
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!
}
}
回答3:
To add any radius or shape you can use a UIBezierPath. The example that I put has left and right corners with a radius and you can use more designable personalizations if you want.
@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
}
}
回答4:
Try this for iOS 11.0+
import UIKit
class MainTabBarController: UITabBarController{
override func viewDidLoad() {
super.viewDidLoad()
tabBar.layer.cornerRadius = 20
tabBar.layer.maskedCorners = [.layerMinXMinYCorner,.layerMaxXMinYCorner]
}
}
来源：https://stackoverflow.com/questions/55042538/how-to-set-top-left-and-right-corner-radius-with-desired-drop-shadow-in-uitabbar