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UIKit Dynamics Tutorial: Getting Started

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1

Learn how to make your user interfaces in iOS feel realistic with this UIKit Dynamics tutorial, updated for Swift!

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/2326-uikit-dynamics-tutorial-getting-started
2

Hi.
after i signed following function

i don’t seed any think in the log

func collisionBehavior(behavior: UICollisionBehavior!, beganContactForItem item: UIDynamicItem!, withBoundaryIdentifier identifier: NSCopying!, atPoint p: CGPoint) {
println(“Boundary contact occurred - (identifier)”)
}

this is example from the project:==>>
import UIKit

protocol UIDynamicItem: NSObjectProtocol{
var center: CGPoint{get set}
var bounds: CGRect{get}
var transform: CGAffineTransform{get set}

}

class ViewController: UIViewController, UICollisionBehaviorDelegate {

var animator: UIDynamicAnimator!
var gravity: UIGravityBehavior!
var collision: UICollisionBehavior!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let square = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
    square.backgroundColor = UIColor.grayColor()
    view.addSubview(square)
    
    let barier = UIView(frame: CGRect(x: 0, y: 300, width: 130, height: 20))
    barier.backgroundColor = UIColor.redColor()
    view.addSubview(barier)
    
    animator = UIDynamicAnimator(referenceView: view)
    gravity = UIGravityBehavior(items: [square])
    animator.addBehavior(gravity)
    
    collision = UICollisionBehavior(items: [square])
    collision.collisionDelegate = self
    //collision = UICollisionBehavior(items: [square, barier])
    collision.addBoundaryWithIdentifier("barier", forPath: UIBezierPath(rect: barier.frame))
    collision.translatesReferenceBoundsIntoBoundary = true
    animator.addBehavior(collision)

// collision.action = {
// print(“(NSStringFromCGAffineTransform(square.transform)) (NSStringFromCGPoint(square.center))”)
// }

}
func collisionBehavior(behavior: UICollisionBehavior, beganContactForItem item: UIDynamicItem, withBoundaryIdentifier identifier: NSCopying?, atPoint p: CGPoint) {
    print("Boundary connect acured - \(identifier)")
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

3

Just ran through this and there are minor syntax issues with Swift 3 in Xcode 8.3.3, so I’ve uploaded my version of the resulting code after following the tutorial:

UIKit Dynamics Tutorial, updated for Swift 3 (Xcode 8.3.3)

4

This tutorial is more than six months old, so questions are no longer supported at the moment for it. We will update it as soon as possible. Thank you! :]