I have an SkSpriteNode (ball) in a box. Gravity is set to false, otherwise it has an SkPhysicsBody to bounce off of walls. Is there a method to give the ”ball” an initial push in a specified direction and velocity/strength wise?

I have a very simple app. All SKSpriteNodes, myBall, myBlue, and myRed. Only myBall moves, affected by gravity, and bounces off of different objects (myRed and myBlue). What I can't figure out is how to make myBall bounce harder or softer depending on which body it hits? I hav been playing with the density of all the objects, but it doesn't seem to make any difference? Is there some property I am unaware of? Or are there other methods?

I would like to take this sample code override func viewDidLoad() { super.viewDidLoad() let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50)) button.backgroundColor = .greenColor() button.setTitle("Test Button", forState: .Normal) button.addTarget(self, action: #selector(buttonAction), forControlEvents: .TouchUpInside) self.view.addSubview(button) } func buttonAction(sender: UIButton!) { print("Button tapped") } ...and place the code to create the button in another file. So it would look more like this: class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() makeButton(vControl: self) } @objc func buttonAction(sender: UIButton!) { print("Button tapped") } } Of course the main flaw is that I would have to pass a pointer to the function buttonAction. Something like we do in C makeButton(vControl: self, bFunc: &buttonAction) Have Googled a lot but can't seem to find the way to do this. How do I set up the makeButton page to recieve this? func makeButton (vControl: ViewController, bFunc: ???) What would the ??? be in reality? thanks

I've created a ball, and boxed my game scene. The balls physics settings are: self.physicsBody!.affectedByGravity = true self.physicsBody!.restitution = 1.0 self.physicsBody!.linearDamping = 0 self.physicsBody!.friction = 0.3 self.physicsBody!.isDynamic = true self.physicsBody!.mass = 0.5 self.physicsBody?.contactTestBitMask = bodyMasks.blankMask.rawValue self.physicsBody?.collisionBitMask  = bodyMasks.edgeMask.rawValue self.physicsBody?.categoryBitMask   = bodyMasks.ballMask.rawValue When I box the game scene with: self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame) the ball bounces back up as intended. However, if I replace edgeLoopFrom with my own custom borders: yourLine.lineWidth = 5 yourLine.path = pathToDraw yourLine.isUserInteractionEnabled = false yourLine.strokeColor = .clear yourLine.isHidden = false yourLine.zPosition = 10 yourLine.physicsBody = SKPhysicsBody(edgeLoopFrom: pathToDraw) yourLine.physicsBody?.affectedByGravity = false yourLine.physicsBody?.pinned = true yourLine.physicsBody?.categoryBitMask = bodyMasks.edgeMask.rawValue yourLine.physicsBody?.collisionBitMask = bodyMasks.ballMask.rawValue yourLine.physicsBody?.contactTestBitMask = bodyMasks.blankMask.rawValue the ball just comes down with a thud, stops, and doesn't bounce., So am trying to figure out what physics settings I have to give to my custom made edges so that the ball bounces?

Below is a simple code patch I use to create a custom button, am new at this. I noticed the text does not appear and am wondering what the proper method is for making the text appear? func makeButton (vControl: ViewController, action: Selector) { let myButtonImage = UIImage(named: "Picture1.png") let imageScale = myButtonImage!.size.width / myButtonImage!.size.height let wwidth = vControl.self.view.bounds.width let button = CreateButton(frame: CGRect(x: 100, y: 100, width: (myButtonImage?.size.width)!/3, height: (myButtonImage?.size.height)!/3)) button.setImage(myButtonImage, for: .normal) button.backgroundColor = .clear button.setTitleColor(.black, for: .normal) button.setTitle("Test Button", for: .normal) button.addTarget(vControl, action: action, for: .touchUpInside) vControl.view.addSubview(button) button.center = vControl.view.center }

While I do need to get another HD, I currently have 34.85 GB (12.61 GB purgeable) available. Yet for some reason when I try to run update on Xcode, it says I don't have enough HD space. That's three times the final size of the new Xcode. Is there some way around this?

So am watching a Speech To Text demo on YouTube, here: https://www.youtube.com/watch?v=SZJ8zjMGUcY There are no files, so am typing from the screen, and immediately run into an error that confuses me. at class ViewController : UIViewController, SFSpeechRecognizer { here's a screenshot: Swift gives me an error indicating that Multiple Inheritance is not allowed. The programmer doesn't have files to download, and I like to start from scratch anyway, typing and copying so I am forced to read each line. Is there something I have to change in the project itself that allows Multiple Inheritances? This video is from last year, and is on Swift 5.0. So I don't think there could be that much of a major change in Swift in that time. Thanks

So sorry if I should't be asking this here, but am trying to find a current-ish tutorial on how to make an app that converts speech to text in real time. Transcribing from text to speech as you're speaking. I've found a few one's on YouTube, but they are quite old, or just transcribing from a recorded file, etc. etc. If anyone is aware of a good tutorial, paid or not, I would so appreciate any link. Thank you

When my app starts up I have my ViewController, which automatically creates my MainScreen (also a view controller). Right after self.addChild(mainController) I call a function which sets my constraints func setConstraints (vc: UIViewController) { vc.view.translatesAutoresizingMaskIntoConstraints = false var constraints = [NSLayoutConstraint]() constraints.append(vc.view.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor)) constraints.append(vc.view.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor)) constraints.append(vc.view.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)) constraints.append(vc.view.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor)) NSLayoutConstraint.activate(constraints) } All is fine up to this point, the MainScreen is bound by the top and bottom safe areas. At some point from MainScreen I create another UIViewController. countController.modalPresentationStyle = .fullScreen self.present(countController, animated: true, completion: {}) Yet, no matter how hard I try to apply the constraints to the new controller, I crash with the following msg: Unable to activate constraint with anchors <NSLayoutXAxisAnchor....because they have no common ancestor. Does the constraint or its anchors reference items in different view hierarchies? That's illegal." Am too new to figure out where my error is.

Below is my code. I have the ViewController, which takes up entire screen (set background color, makes sure status bar is visible, etc. It then calls up the MainController, which is set to be only in the safeAreaLayout frame. It has a button that brings up a third view controller when clicked. Everything works, the ViewController covers the entire screen, the MainController rests within the safeAreaLayouts of the iPhone X, and the third view controller comes up the same size and position as the MainController. It's that last part I want to make sure of, that that is the way it is supposed to come up. Can I count on that? Or must I set its frame myself to be sure? ViewController class ViewController: UIViewController { var mainController = MainController() override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() self.addChild(mainController) self.view.addSubview(mainController.view) setConstraints(vc: mainController, pc: view) } override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = bgColor } override var prefersStatusBarHidden: Bool { return false } override var preferredStatusBarStyle: UIStatusBarStyle { return .darkContent } } func setConstraints (vc: UIViewController, pc: UIView) { vc.view.translatesAutoresizingMaskIntoConstraints = false var constraints = [NSLayoutConstraint]() constraints.append(vc.view.leadingAnchor.constraint(equalTo: pc.safeAreaLayoutGuide.leadingAnchor)) constraints.append(vc.view.trailingAnchor.constraint(equalTo: pc.safeAreaLayoutGuide.trailingAnchor)) constraints.append(vc.view.bottomAnchor.constraint(equalTo: pc.safeAreaLayoutGuide.bottomAnchor)) constraints.append(vc.view.topAnchor.constraint(equalTo: pc.safeAreaLayoutGuide.topAnchor)) NSLayoutConstraint.activate(constraints) } MainController class MainController: UIViewController { private lazy var countController = CountController() var invButton : MyButton! override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = .black ...button code .... } override var prefersStatusBarHidden: Bool { return false } @objc func buttonAction(sender: UIButton!) { guard let theButton = sender as? MyButton else { return} self.addChild(countController) self.view.addSubview(countController.view) } } ThirdViewController class CountController : UIViewController { var backButton : MyButton! override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) } override func viewDidLoad() { super.viewDidLoad() self.view.backgroundColor = .gray } }

I have my mainController (parent) and my menuController (child). I call the menuController with addChild(child) view.addSubview(child.view) child.didMove(toParent: self) The child dismisses itself with: self.dismiss(animated: true, completion: nil) The question I have, is how do I clean up the child within the parent? Surely I have to do something?

At the very bottom is my code where MainController initiates a subview called setController. The new subview is created when I click the button However, within setController's code I get back a nil when I try to the superview: override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) print("\(self.view.superview)" ?? "count->no parent") } I am assigning the second view as a subview, but obviously I am missing something. Have I misunderstood how UIView hierarchy works? class MainController: UIViewController { private lazy var setController = SetController() var invButton : MyButton! override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = .black invButton = makeButton(vControl: self, btype: ButtType.inv, action: #selector(self.buttonAction(sender:))) invButton.frame.origin.x = self.view.frame.width * 0.1 invButton.frame.origin.y = self.view.frame.height * 0.1 invButton.setTitle("Settings", for: .normal) } override var prefersStatusBarHidden: Bool { return false } @objc func buttonAction(sender: UIButton!) { guard let theButton = sender as? MyButton else { return} UIView.transition(with: self.view, duration: 0.5, options: .transitionCurlDown, animations: { [self] in self.addChild(setController) self.view.addSubview(setController.view) setController.didMove(toParent: self) }, completion: nil) } }

I've learned the hard way that specific commands to add a child UIView must be in a certain order, especially if I am bringing in the child UIView using animation. So I'd like to be clear that what the order I use to delete a child UIView is correct. Yes, what I have below works. But that doesn't mean it's correct. Thank you UIView.transition(with: parent, duration: 0.5, options: .transitionCurlUp, animations: { [self] in self.willMove(toParent: nil); self.removeFromParent(); self.view.removeFromSuperview(); self.dismiss(animated: false, completion: nil); }, completion:nil)

Thanks to people on this board I am able to successfully calla up a child UIViewConroller via animation with: This is the buttonAction from the Main UIViewController, which calls up setController @objc func buttonAction(sender: UIButton!) { guard let theButton = sender as? MyButton else { return} UIView.transition(with: self.view, duration: 0.5, options: .transitionCurlDown, animations: { [self] in self.addChild(setController); self.view.addSubview(setController.view); }, completion: { [self]_ in setController.didMove(toParent: self); setController.doLayout();}) } the doLayout method lies within the child: func doLayout (){ guard let parent = cView!.view.superview else {return} //make sure UIV honors safeAreaLayouts setConstraints(vc: self, pc: parent) } A button within the child, setController, dismisses itself: @objc func buttonAction(sender: UIButton!) { self.willMove(toParent: nil) self.removeFromParent() self.view.removeFromSuperview() self.dismiss(animated: false, completion: nil) } Everything works great the first time I call up the child UIView. It curls down while covering the first/parent UIVIEW, etc. etc. Figure 1 But after I dismiss the child view and call it again, the child view scrolls down without really covering the main view, it's like a mishmash. Figure 2 Only after all is said and done, then the child view covers everything. So am curious if I am dismissing something incorrectly.

Copied the code below from a tutorial, and I mostly understand what is going on. But I'd like to be able to fully read it. What I do get is that: handler can be nil, but here it's the code to run upon the completion of UIAlertAction. But am unsure what (_) in is. I have also sometimes seen it as [self] in Thank you controller.addAction(UIAlertAction(title: "OK", style: .default, handler: { (_)  in controller.dismiss(animated: true, completion: nil)}))