Storyboard Tips - Updating Constraints (iOS, Xcode 8)

Updating constraints on the storyboard can be easy with these tips:

Transparent TableView - Zelda App (iOS, Xcode 8, Swift 3)

Learn how to make your table view transparent so you can see the background through it. You will also learn a little about customizing the tableview's separator.

Closures - Zelda App (iOS, Xcode 8, Swift 3)

You may not be creating closures all the time but it is good to know about them and how they work because you will be using them ALL the time.

Play A Movie That Is In Your Project

On your Storyboard, add a "AVKit Player View Controller". Connect it with a Segue from a UIButton you put on the View Controller.

Like this:

 
import UIKit
import AVKit
import AVFoundation

class ViewController: UIViewController {
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        let destination = segue.destination as! AVPlayerViewController
        let url = Bundle.main.url(forResource: "myMovieName", withExtension: "m4v")
        
        if let movieURL = url {
            destination.player = AVPlayer(url: movieURL)
        }
    }
}
 

(Xcode 8.2, Swift 3)

Introduction to iOS Threading - Zelda App (Xcode 8, Swift 3)

Get an introduction to threading in iOS to make your apps more responsive when another process is taking a long time.

Show Execution Time (Elapsed Time)

Sometimes you want to see how long it took some code to execute. Here is an example of one way you could do this.

 
func myLongRunningFunction() {
    let start = Date()

    // Do you work

    let end = Date()
    let elapsedTime = end.timeIntervalSince(start)
    print("Elapsed Time: \(elapsedTime)")
}
 

(Swift 3)

iOS Tinder-Like Swipe - Part 5 - Scaling the Card (Xcode 8, Swift 3)

The final part! As you slide the card closer to the edge of the screen, we also want to scale the card down (make smaller). Here is how you do that:

iOS Tinder-Like Swipe - Part 4 - Rotating the Card (Xcode 8, Swift 3)

As you swipe the card side-to-side, we want to apply a rotation transform to the card. The closer you get to the edge, the more rotation. I walk you through all the steps.

iOS Tinder-Like Swipe - Part 3 - Animating card off screen (Xcode 8, Swi...

When the card gets close to the edge of the screen, we want it to continue off the screen by animating it off.

iOS Tinder-Like Swipe - Part 2 - Fading image in and out (Xcode 8, Swift 3)

Show the thumbs up or thumbs down while doing the Tinder-like swiping action on the card.

iOS Tinder-Like Swipe - Part 1- UIPanGestureRecognizer (Xcode 8, Swift 3)

Create Tinder-like swiping in your app. This was a fun tutorial series to make. Hope you enjoy it!

Also, a viewer pointed out something that can make the dragging of the card code a little simpler.

Instead of:

 
let point = sender.translation(in: view)
card.center = CGPoint(x: view.center.x + point.x, y: view.center.y + point.y)
 

You can just do:

 
card.center = sender.location(in: view)
 

Easy!

Storyboard Tips - Easily Work With Layers Of Controls (iOS, Xcode 8)

Storyboard Tips. When working with layers of views and other controls, use this is a handy tip to get underneath other controls to make modifications and put everything back to the way it was with a click of a button!

Timer in Apps (Swfit 3, Xcode 8, iOS)

In this example I start a timer as soon as I enter the second view controller after clicking the "START MY RANDOM WORKOUT" button. Here is the code for that second view:

 
import UIKit

class ExerciseVc: UIViewController {

    @IBOutlet weak var timerLabel: UILabel!
    
    @IBOutlet weak var icon: UIImageView!
    var timer: Timer!
    var timeLeft = 60
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Call setTimeLeft every 1 second
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: 
            #selector(self.setTimeLeft), userInfo: nil, repeats: true)
        icon.image = #imageLiteral(resourceName: "situp")
    }

    func setTimeLeft() {
        timeLeft -= 1 // Subtract one second
        
        if timeLeft == 0 {
            stop()
        }
        
        timerLabel.alpha = 1
        timerLabel.transform = CGAffineTransform(scaleX: 1.4, y: 1.4)
        
        UIView.animate(withDuration: 1, animations: {
            self.timerLabel.text = "\(self.timeLeft)"
            self.timerLabel.alpha = 0.3
            self.timerLabel.transform = .identity
        })
    }
    
    @IBAction func stop(_ sender: UIButton) {
        stop()
    }
    
    // Show a white status bar instead of the default black one
    override var preferredStatusBarStyle: UIStatusBarStyle {
        get {
            return UIStatusBarStyle.lightContent
        }
    }
    
    func stop() {
        timer.invalidate() // Stop the timer
        dismiss(animated: true, completion: nil)
    }
}
 

(Swift 3)