iOS Topics in Swift 5

Miscellaneous iOS 12 Swift 5.0 programs that implement minimal examples for various random topics.

I will blog about each examples as time permits under this section of my website: http://www.h4labs.com/dev/ios/swift_cookbook.html For now, I'll place notes in README.md files with each project.

Please note that I'm creating most of these application as "Single View Applications" then adding views (e.g. UITableView) in code. It's a personal preference to not use Storyboards.

AutoLayout Centered Button using iOS9 Anchors

NSLayoutConstraint.activate([
    centeredButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
    centeredButton.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 0)
    ])

AutoLayout Two Button in StackView

• Buttons are equal size with 25 points between them
• StackView is centered horizontally
• StackView 10 points above bottom anchor
• Add some extra padding to button width and height

// Add some extra button padding
rightBtn.contentEdgeInsets = UIEdgeInsets.init(top: 5, left: 5, bottom: 5, right: 5)

Various UIButtons in a UIStackView

UIAlertController Example

Simple UIView Subclass

Gradient Layer

Basic UITableViewController Subclass

• Subclass UITableViewController
• Custom Header Height
• Set Header Cell Color
• Fixed Row Height: tableView.rowHeight = 80

Basic UITableViewController with Custom UITableViewCell

UITableViewController Subclass with Sections

UITableViewController Subclass with Sections and an Index

Custom UITableView Header

UICollectionViewController Subclass

UICollectionViewController Delegate

UICollectionView with Custom Cell

UISwitch

UISegmentedControl

CAShapeLayer with Basic Shapes

• CAShapeLayer() added to a UIViewController
• Use UIBezierPath to draw shapes

Animate the Drawing of a Bezier Line

Animate the Drawing of a Bezier Circle

Transition from One View to Another with a Curl Up

Transition from One View with UILabel to Another with a Curl Up

Single Tap Gesture on View

Simple AVAudioPlayer Example

Size, Rotate, and Fade Transforms

func rotateIt() {
    UIView.animate(withDuration: 2,
        delay: 0,
        options: .curveEaseInOut,
        animations: {

            let transform = CGAffineTransform.identity.rotated(by: .pi)

            self.label.transform = CGAffineTransform(rotationAngle: .pi)

            self.aView.transform = transform
        }, completion: {_ in

            self.fadeIt()
        })
    }

Simple UIView Subclass

A StackView in a StackView

Programmatically Show/Push ViewController

func nextController(_ sender:UIButton) {
    let secondViewController = SecondViewController()

    self.navigationController?.pushViewController(secondViewController, animated: true)
}

func previousController(_ sender:UIButton) {

    _ = self.navigationController?.popViewController(animated: true)
}

No Nib Project - All Code

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    
    self.window = UIWindow(frame: UIScreen.main.bounds)
    let navController = UINavigationController()
    self.window?.rootViewController = navController
    let topLevelController = ViewController()
    navController.addChildViewController(topLevelController)
    
    self.window?.makeKeyAndVisible()
    
    return true
}

UIPickerView

Countdown Timer

 timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTimer), userInfo: nil, repeats: true)

Core Data

Game Clock

WebView

AppRotation

• Misc Notes

ImageMagick

• Fix Mac OS installation error

• http://stackoverflow.com/questions/22715738/imagemagick-error

convert ./screenshot.png -resize 25% screenshot-small.png; # Smaller screenshot
convert ./screenshot.png -resize 20% screenshot-toc.png; # Table of Contents screenshot

Ideas and In-Progress

• Handle Device Rotation
• Pan Gesture|https://github.com/melling/ios_topics/blob/master/PanGesture/PanGesture
• PDF Creation
• Save Image to Photos
• Dispatch Async
• Core Data
• sqlite|
• Read plist

Old

AutoLayout Centered Button