Creating a Custom Tab Bar

I want to create a custom tab bar at the top. Just like 9gag. Do you know a place where i can learn how to do it? (documentiation or video tutorial) Thanks 9gag custom tab bar

A work around which I implemented.

Create a view to have the custom tab bar.

let tabView = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 60))
tabView.backgroundColor = UIColor(red: 45/255, green: 58/255, blue: 114/255, alpha: 1)
self.view.addSubview(tabView)

Depending on the number of buttons, decide the button size and add them as subview.(Taking 2 here)

firstButton = UIButton(type: .Custom)
firstButton.frame = CGRect(x: 0, y: 20, width: tabView.frame.size.width / 2, height: 30)
firstButton.setTitle("BUT 1", forState: .Normal)
firstButton.setTitleColor(UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0), forState: .Normal)
firstButton.addTarget(self, action: #selector(ViewController.firstButtonTapped), forControlEvents: .TouchUpInside)

tabView.addSubview(firstButton)

secondButton = UIButton(type: .Custom)
secondButton.frame = CGRect(x: tabView.frame.size.width / 2, y: 20, width: tabView.frame.size.width / 2, height: 30)
secondButton.setTitle("BUT 2", forState: .Normal)
secondButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
secondButton.addTarget(self, action: #selector(ViewController.secondButtonTapped), forControlEvents: .TouchUpInside)

tabView.addSubview(secondButton)

Add a small UIView which serves as a line below the buttons.

 lineView = UIView()
lineView.frame = CGRect(x: 0, y: CGRectGetMaxY(tabView.frame) - 3, width: tabView.frame.size.width / 2, height: 3)
lineView.backgroundColor = UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0)

tabView.addSubview(lineView)

Make the view below in a scrollview.

 self.scrollView.frame = CGRectMake(0, CGRectGetMaxY(tabView.frame), self.view.frame.width, self.view.frame.height)
self.scrollView.backgroundColor = UIColor.whiteColor()
self.scrollView.delegate = self
self.scrollView.pagingEnabled = true

self.view.addSubview(self.scrollView)

let aScrollViewWidth = self.scrollView.frame.width
let aScrollViewHeight = self.scrollView.frame.height
self.scrollView.contentSize = CGSizeMake(aScrollViewWidth * CGFloat(2), aScrollViewHeight)

Add your views one after the other. For the sake of the example, I am just adding a UITextView.

for anIndex in 0  ..< 2  {

    let anEssayTextView = UITextView(frame: CGRectMake(aScrollViewWidth * CGFloat(anIndex), 0, aScrollViewWidth, aScrollViewHeight))
    anEssayTextView.text = essays[anIndex]
    anEssayTextView.editable = false
    self.scrollView.addSubview(anEssayTextView)

}

ScrollView delegate function

 func scrollViewDidEndDecelerating(scrollView: UIScrollView) {

pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)

if (pageNumber == 0) {
    firstButtonTapped()
} else {
    secondButtonTapped()
}
}

Button actions

func firstButtonTapped() {

firstButton.setTitleColor(UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0), forState: .Normal)
secondButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)

if (self.lineView.frame.origin.x != 0) {

    UIView.animateWithDuration(0.25) {

        self.lineView.frame.origin.x -= self.tabView.frame.size.width / 2

    }

}

scrollView.setContentOffset(CGPointMake(0, 0), animated: true)

pageNumber = 0

}


func secondButtonTapped() {

firstButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
secondButton.setTitleColor(UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0), forState: .Normal)

if (self.lineView.frame.origin.x != self.tabView.frame.size.width / 2) {

    UIView.animateWithDuration(0.25) {

        self.lineView.frame.origin.x += self.tabView.frame.size.width / 2

    }

}

scrollView.setContentOffset(CGPointMake(self.scrollView.frame.size.width, 0), animated: true)

pageNumber = 1

}

You can use a collection view to create something like this.

Here is how to do it:

Create your ViewController interface like shown in the screenshot below:

Don't forget to set the scroll direction of collection view to horizontal

2. Create the custom collection view cell class as

    import UIKit


    class CustomCollectionViewCell: UICollectionViewCell
    {
        //MARK: Outlets
        @IBOutlet private weak var titleLabel: UILabel!
        @IBOutlet private weak var blueDividerLineImageView: UIImageView!

        //MARK: Overridden Properties

    override var isSelected: Bool{
        willSet{
            super.isSelected = newValue
            if newValue
            {
                self.titleLabel.textColor = UIColor(red: 0.0/255.0, green: 122.0/255.0, blue: 255.0/255.0, alpha: 1.0)
                self.blueDividerLineImageView.isHidden = false
            }
            else
            {
                self.titleLabel.textColor = UIColor.black
                self.blueDividerLineImageView.isHidden = true
            }
        }
    }

    //MARK: Internal Properties
    var titleString : String?{
        get{
            return self.titleLabel.text
        }
        set{
            self.titleLabel.text = newValue
        }
    }

    //MARK: View Lifecycle Methods
    override func awakeFromNib()
    {
        self.titleLabel.text = nil


     }
}

3. Create your ViewController class as:

import UIKit

class ViewController: UIViewController
{
    @IBOutlet weak var customCollectionView: UICollectionView!

    let tabsArray = ["Tab 1", "Tab 2", "Tab 3", "Tab 4", "Tab 5"]

    override func viewDidLoad()
    {
    }

    override var prefersStatusBarHidden: Bool{
        return true
    }
}

// MARK: - UICollectionViewDataSource, UICollectionViewDelegate Methods
extension ViewController : UICollectionViewDataSource, UICollectionViewDelegate
{
    //MARK: UICollectionViewDataSource
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    {
        return self.tabsArray.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomCollectionViewCell", for: indexPath) as! CustomCollectionViewCell
        cell.titleString = self.tabsArray[indexPath.row]
        return cell
    }

    //MARK: UICollectionViewDelegate
    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath)
    {
        //For initially highlighting the first cell of "customCollectionView" when ViewController is loaded
        guard let _ = collectionView.indexPathsForSelectedItems?.first, indexPath.row != 0 else
        {
            cell.isSelected = true
            collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .left)
            return
        }
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
    {
        collectionView.selectItem(at: indexPath, animated: true, scrollPosition: .centeredHorizontally)
        print("\(self.tabsArray[indexPath.row]) Pressed")

        //Do your task here..whatever you want to do when pressing the tabs
    }
}

The output screen is:

来源：https://stackoverflow.com/questions/40551000/creating-a-custom-tab-bar

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swift

tabbar