9 Notes September 2021

1. Navigate right and left tabbar file in Xcode 12 and new verison

⌘ ⇧ [ or ] to navigate left and right of the tabs.

source: https://samwize.com/2020/08/21/navigating-xcode-12-and-tabs/

2. Change UIView width size without (.constant)

when I need to change width side but the (.xib) not need to change because use another class
so for this change I'll use programatically.

import UIKit

class ComposerViewController: UIViewController {
    @IBOutlet weak var tabelView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupTableView()
        
    }
    
    func setupTableView() {
        tabelView.register(cellType: TestTableViewCell.self)
        tabelView.dataSource = self
        tabelView.delegate = self
    }

}

extension ComposerViewController: UITableViewDataSource, UITableViewDelegate {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 2
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tabelView.dequeueReusableCell(with: TestTableViewCell.self, for: indexPath)
        if indexPath.row == 1 {
            cell.view2.backgroundColor = .orange
            cell.view2.widthAnchor.constraint(equalToConstant: 50).isActive = true
        }
        return cell
    }

}

3. Select and Unselect tintBar color 

For this case you can put this code into your tabBarcontroller file
/*

tabBar.tintColor = .select

tabBar.unselectedItemTintColor = .gray
*/

final class MainTabbarController: UITabBarController, UITabBarControllerDelegate {
    override func viewDidLoad() {
        setupTabbar()
    }
    
    private func setupTabbar() {
        tabBar.shadowImage = UIImage()
        tabBar.backgroundImage = UIImage()
        tabBar.tintColor = .select
        tabBar.unselectedItemTintColor = .gray
    }
}

4.  When Get response "UIExtendedGrayColorSpace" when debug area

This color in your code

UIExtendedGrayColorSpace 0 0 is "Clear"
UIExtendedGrayColorSpace 1 1 is "white"
UIExtendedGrayColorSpace 1 1 is "Black"

5. How to delay splashscreen / Launchscreen swift

Just add this code " Thread.sleep(forTimeInterval: 3) " in appdelegate or scenedelegate

 //Appdelegate

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        Thread.sleep(forTimeInterval: 3)

        return true
    }
//SceneDelegate
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
  
        Thread.sleep(forTimeInterval: 3)

    }

6. Dynamic cell for UICollectionViewCell

You don't need UICollectionViewDelegateFlowLayout’s method sizeForItemAt  for set dynamic cell collection view cell, just use this code

   // MARK: set dynamic size cell
    var layout: UICollectionViewFlowLayout = {
        let layout = UICollectionViewFlowLayout()
        let width = UIScreen.main.bounds.size.width
        layout.estimatedItemSize = CGSize(width: width, height: 20)
        return layout
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        setupCollection()

    }


private func setupCollection() {
        categoryCollectionView.registerCell(CategoryCollectionViewCell.self)
        categoryCollectionView.collectionViewLayout = layout // here
        categoryCollectionView.dataSource = self
        categoryCollectionView.delegate = self
}

Source: Author

Source: https://medium.com/@andrea.toso/uicollectionviewcell-dynamic-height-swift-b099b28ddd23

7. Error when decode data 

When request API using alamofire I get error when decode, in condition I already get data JSON

do {
    let decoder = JSONDecoder()
    let newValue = try decoder.decode(T.self, from: data)
    completion?(.success(newValue))
} catch let error {
    debugPrint(error)
    completion?(.failure(.parsingFailure))
}

solution is fixing model response data (T.self) is response model, because found error when some key wrong type like (id: String) must be (id: Int).

8. How make dynamic size UIView

I got some issue when need dynamic UIView width as UILabel inside view, have two ways for solve that with code and use design(xib/storyboard)  in this time I want to use design in xib.

Equal width view and uilabel whne have 3 subviews in same line horizontal.
- For first uiview set default is (top: 0, bottom: 0, lading: 0, right: 0).
 - In Second Equal widths constraint priority set 1000 for  is (top: 0, bottom: 0, lading: 0, right: 0)

 - Third Equal widths constraint priority set 250 for  is (top: 0, bottom: 0, lading: 0, right: 0)

9.  What is Final class in swift

In swift when you declare a class as being final, no other class can inherit from it. This means they can’t override your methods in order to change your behavior – they need to use your class the way it was written.


source: https://www.hackingwithswift.com/sixty/8/4/final-classes

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Handle height tableview auto height into cell
https://21zerixpm.medium.com/tableview-in-uitableviewcell-3c7cf123d969

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