Rotation & Pinch(scale) gesture messes parent UIView and his subviews frame - objective-c

I'm trying to implement Pinch & Rotate gestures on a UIView who contains several subviews(UIButton,UITextView).
Code organized below to your convenience
I'm guessing i'm missing something. No idea what tho. Thank you!
Result :
Code
Scale :
var scaleAnchorPoint = CGPoint()
func handleSizeIncreasing(sender:UIPinchGestureRecognizer) {
if sender.state == UIGestureRecognizerState.Began
{
print("Began")
scaleAnchorPoint = self.center
}
else if sender.state == UIGestureRecognizerState.Changed
{
txtView.transform = CGAffineTransformScale(txtView.transform, sender.scale, sender.scale)
sender.scale = 1.0
self.frame.size = CGSizeMake(txtView.frame.width + buttonSize, txtView.frame.height + buttonSize)
self.center = scaleAnchorPoint
updateViews(scaleAnchorPoint)
print("Changed")
}
}
Rotate :
var rotateAnchorPoint = CGPoint()
func handleRotate(sender : UIRotationGestureRecognizer) {
if sender.state == UIGestureRecognizerState.Began
{
print("Began")
rotateAnchorPoint = self.center
}
else if sender.state == UIGestureRecognizerState.Changed
{
sender.view!.transform = CGAffineTransformRotate(sender.view!.transform, sender.rotation)
sender.rotation = 0
updateViews(rotateAnchorPoint)
print("Changed")
}
}
Side:
func updateViews(aroundPoint : CGPoint )
{
self.center = aroundPoint
txtView.frame.origin = CGPointMake(buttonSize / 2, buttonSize / 2)
txtView.contentSize = txtView.frame.size
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}

Figured it out. Simply, when the scale/frame changes, instead of accessing the Frame like i did here : self.frame.size = CGSizeMake(txtView.frame.width + buttonSize, txtView.frame.height + buttonSize)
Access self.bounds , like this -
self.bounds.size = CGSizeMake(txtView.frame.width + buttonSize, txtView.frame.height + buttonSize)
Enjoy!

Related

layout.sectionHeadersPinToVisibleBounds in UICollectionViewDiffableDataSource

I want to keep the header in a UICollectionViewDiffableDataSource, as I understand I can do it with layout.sectionHeadersPinToVisibleBounds, but it's not usable with my collectionView layout
private func createLayout() -> UICollectionViewLayout {
return UICollectionViewCompositionalLayout { section, layoutEnvironment in
var config = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
config.headerMode = section == 0 ? .none : .firstItemInSection
config.backgroundColor = .darkGrayBackground
config.showsSeparators = false
let section = NSCollectionLayoutSection.list(using: config, layoutEnvironment: layoutEnvironment)
section.interGroupSpacing = 30
self.addHeader(to: section)
return section
}
}
private func addHeader(to section: NSCollectionLayoutSection) {
let headerFooterSize = NSCollectionLayoutSize(
widthDimension: .fractionalWidth(1.0),
heightDimension: .estimated(20)
)
let sectionHeader = NSCollectionLayoutBoundarySupplementaryItem(
layoutSize: headerFooterSize,
elementKind: UICollectionView.elementKindSectionHeader,
alignment: .top
)
section.boundarySupplementaryItems = [sectionHeader]
}
and
collectionView = UICollectionView(frame: bounds, collectionViewLayout: createLayout())
I even can't access to it via
if let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
layout.sectionHeadersPinToVisibleBounds = true // never called
}
Could anyone help me on this? Thank you so much

Stoping a function from happening when a spirit is removed swift 3

I'm having an issue when my Spirit dies or is removed by removeFromParent()
command. The Spirit is removed successful but I can still shoot missiles even when the Spirit isn't there. My code for the GameScene.swft is as follows:
import SpriteKit
import GameplayKit
import CoreMotion
class GameScene: SKScene, SKPhysicsContactDelegate {
var starfield:SKEmitterNode!
var player = SKSpriteNode()
var scoreLabel:SKLabelNode!
var score:Int = 0 {
didSet {
scoreLabel.text = "Score: \(score)"
}
}
var gameTimer:Timer!
var possibleAliens = ["alien", "alien2", "alien3"]
let alienCategory:UInt32 = 0x1 << 1
let photonTorpedoCategory:UInt32 = 0x1 << 0
let photonshuttleCategory:UInt32 = 0x1 << 0
let photonalienCategory: UInt32 = 0x1 << 0
let shuttleCategory:UInt32 = 0x1 << 1
let motionManger = CMMotionManager()
var xAcceleration:CGFloat = 0
override func didMove(to view: SKView) {
self.physicsWorld.contactDelegate = self
starfield = SKEmitterNode(fileNamed: "Starfield")
starfield.position = CGPoint(x: 0, y: 1472)
starfield.advanceSimulationTime(10)
self.addChild(starfield)
func restart(){
let mainStoryboard = UIStoryboard(name: "Start", bundle: nil)
let vc = mainStoryboard.instantiateViewController(withIdentifier: "Start")
self.view?.window?.rootViewController?.present(vc, animated: true, completion: nil)
}
starfield.zPosition = -1
player = SKSpriteNode(imageNamed: "shuttle")
player.position = CGPoint(x: self.frame.size.width / 2, y: player.size.height / 2 + 20)
var Ghost = player
Ghost.physicsBody = SKPhysicsBody(circleOfRadius: (Ghost.frame.height) / 2)
Ghost.physicsBody?.categoryBitMask = photonshuttleCategory
Ghost.physicsBody?.collisionBitMask = 0
Ghost.physicsBody?.contactTestBitMask = alienCategory
Ghost.physicsBody?.isDynamic = true
Ghost.physicsBody?.usesPreciseCollisionDetection = true
self.addChild(player)
self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
self.physicsWorld.contactDelegate = self
scoreLabel = SKLabelNode(text: "Score: 0")
scoreLabel.position = CGPoint(x: 100, y: self.frame.size.height - 60)
scoreLabel.fontName = "AmericanTypewriter-Bold"
scoreLabel.fontSize = 36
scoreLabel.fontColor = UIColor.white
score = 0
if score >= 100{
player = SKSpriteNode(imageNamed: "Spaceship")
}
self.addChild(scoreLabel)
gameTimer = Timer.scheduledTimer(timeInterval: 0.2, target: self, selector: #selector(addAlien), userInfo: nil, repeats: true)
if score >= 100{
gameTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(addAlien), userInfo: nil, repeats: true)
}
motionManger.accelerometerUpdateInterval = 0.1
motionManger.startAccelerometerUpdates(to: OperationQueue.current!) { (data:CMAccelerometerData?, error:Error?) in
if let accelerometerData = data {
let acceleration = accelerometerData.acceleration
self.xAcceleration = CGFloat(acceleration.x) * 0.75 + self.xAcceleration * 0.25
}
}
}
func addAlien () {
possibleAliens = GKRandomSource.sharedRandom().arrayByShufflingObjects(in: possibleAliens) as! [String]
let alien = SKSpriteNode(imageNamed: possibleAliens[0])
let randomAlienPosition = GKRandomDistribution(lowestValue: 0, highestValue: 414)
let position = CGFloat(randomAlienPosition.nextInt())
alien.position = CGPoint(x: position, y: self.frame.size.height + alien.size.height)
alien.physicsBody = SKPhysicsBody(rectangleOf: alien.size)
alien.physicsBody?.isDynamic = true
alien.physicsBody?.categoryBitMask = alienCategory
alien.physicsBody?.contactTestBitMask = photonTorpedoCategory
alien.physicsBody?.collisionBitMask = 0
self.addChild(alien)
let animationDuration:TimeInterval = 6
var actionArray = [SKAction]()
actionArray.append(SKAction.move(to: CGPoint(x: position, y: -alien.size.height), duration: animationDuration))
actionArray.append(SKAction.removeFromParent())
alien.run(SKAction.sequence(actionArray))
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
let delay = SKAction.wait(forDuration: 2.6)
self.run(delay)
fireTorpedo()
}
func fireTorpedo() {
self.run(SKAction.playSoundFileNamed("torpedo.mp3", waitForCompletion: false))
let torpedoNode = SKSpriteNode(imageNamed: "torpedo")
torpedoNode.position = player.position
torpedoNode.position.y += 60
torpedoNode.physicsBody = SKPhysicsBody(circleOfRadius: torpedoNode.size.width / 2)
torpedoNode.physicsBody?.isDynamic = true
torpedoNode.physicsBody?.categoryBitMask = photonTorpedoCategory
torpedoNode.physicsBody?.contactTestBitMask = alienCategory
torpedoNode.physicsBody?.collisionBitMask = 0
torpedoNode.physicsBody?.usesPreciseCollisionDetection = true
self.addChild(torpedoNode)
let animationDuration:TimeInterval = 0.3
var actionArray = [SKAction]()
actionArray.append(SKAction.move(to: CGPoint(x: player.position.x, y: self.frame.size.height + 10), duration: animationDuration))
actionArray.append(SKAction.removeFromParent())
torpedoNode.run(SKAction.sequence(actionArray))
}
func didBegin(_ contact: SKPhysicsContact) {
var firstBody:SKPhysicsBody
var secondBody:SKPhysicsBody
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
}else{
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if (firstBody.categoryBitMask & photonTorpedoCategory) != 0 && (secondBody.categoryBitMask & alienCategory) != 0 {
torpedoDidCollideWithAlien(torpedoNode: firstBody.node as! SKSpriteNode, alienNode: secondBody.node as! SKSpriteNode)
}
}
func torpedoDidCollideWithAlien (torpedoNode:SKSpriteNode, alienNode:SKSpriteNode) {
let explosion = SKEmitterNode(fileNamed: "Explosion")!
explosion.position = alienNode.position
self.addChild(explosion)
self.run(SKAction.playSoundFileNamed("explosion.mp3", waitForCompletion: false))
torpedoNode.removeFromParent()
alienNode.removeFromParent()
self.run(SKAction.wait(forDuration: 2)) {
explosion.removeFromParent()
}
score += 5
}
func hitdidBegin(_ contact: SKPhysicsContact) {
var firstBody:SKPhysicsBody
var secondBody:SKPhysicsBody
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
}else{
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if (firstBody.categoryBitMask & photonshuttleCategory) != 0 && (secondBody.categoryBitMask & alienCategory) != 0 {
spaceshipDidCollideWithNode(alienNode: secondBody.node as! SKSpriteNode, spaceShip: firstBody.node as! SKSpriteNode)
}
}
func spaceshipDidCollideWithNode (alienNode:SKSpriteNode, spaceShip:SKSpriteNode){
let explosion = SKEmitterNode(fileNamed: "Explosion")
explosion?.position = alienNode.position
self.addChild(explosion!)
self.run(SKAction.playSoundFileNamed("explosion.mp3", waitForCompletion: false))
alienNode.removeFromParent()
spaceShip.removeFromParent()
self.run(SKAction.wait(forDuration: 2)){
explosion?.removeFromParent()
}
score = 0
}
override func didSimulatePhysics() {
player.position.x += xAcceleration * 50
if player.position.x < -20 {
player.position = CGPoint(x: self.size.width + 20, y: player.position.y)
}else if player.position.x > self.size.width + 20 {
player.position = CGPoint(x: -20, y: player.position.y)
}
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
}
What I want to happen is that the fireTorpedo function will not be called when the Ghost/shuttle/player is removed.
Thank you.
There is a few ways to achieve what you want
1) You check if the players parent property is nil and not fire the torpedo if it is (I am not sure this is the best way)
func fireTorpedo() {
guard player.parent != nil else { return }
...
}
2) You could make your player an optional property
class GameScene: SKScene {
var player: SKSpriteNode?
override func didMove(to view: SKView) {
player = SKSpriteNode()
...
}
}
and when you remove it set it to nil
player = nil
and than not fire the torpedo if the player is nil
func fireTorpedo() {
guard player != nil else { return }
...
}
3) You can create another property in your GameScene class
var isPlayerRemoved = false
Than when you remove your player just set it to true
isPlayerRemoved = true
and than adjust your torpedo function to this
func fireTorpedo() {
guard !isPlayerRemoved else { return }
...
}
Hope this helps

How can I animate a text change in swift or objective-c?

I tried a test-project. It worked but the method I used, put programmatically created labels over old existing labels. When the length of a string array is lower than the old one, it shows unnecessary old labels due to addSubview method.
How can I handle this problem?
import UIKit
extension UIView {
func pushTransition(duration:CFTimeInterval) {
let animation:CATransition = CATransition()
animation.timingFunction = CAMediaTimingFunction(name:
kCAMediaTimingFunctionEaseInEaseOut)
animation.type = kCATransitionPush
animation.subtype = kCATransitionFromBottom
animation.duration = duration
self.layer.addAnimation(animation, forKey: kCATransitionPush)
}
}
class ViewController: UIViewController {
var current:Float = 125.24
var discount:Float = 1.212342748
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func doAction(sender: AnyObject) {
let currentstr = String(format: "₺%.2f", self.current)
let length = currentstr.characters.count
var strarray = Array(currentstr.characters)
strarray[length-3] = ","
print(strarray)
self.current = self.current-self.discount
let newcurrent = String(format: "₺%.2f", self.current)
let newcurrentlength = newcurrent.characters.count
var newcurrentarray = Array(newcurrent.characters)
newcurrentarray[newcurrentlength-3] = ","
print(newcurrentarray)
var labels = [UILabel]()
print(labels)
if (length == newcurrentlength) {
for i in 1 ..< length+1 {
labels.append(UILabel(frame: CGRectMake((15*CGFloat(i)), 100, 20, 20)))
if (strarray[i-1] == newcurrentarray[i-1]){
print("SAME")
labels[i-1].text = String(newcurrentarray[i-1])
labels[i-1].textAlignment = NSTextAlignment.Center
labels[i-1].backgroundColor = UIColor.redColor()
self.view.addSubview(labels[i-1])
} else {
print("CHANGED")
labels[i-1].pushTransition(0.4)
labels[i-1].text = String(newcurrentarray[i-1])
labels[i-1].textAlignment = NSTextAlignment.Center
labels[i-1].backgroundColor = UIColor.redColor()
self.view.addSubview(labels[i-1])
}
}
} else {
for i in 1..<newcurrentlength+1 {
labels.append(UILabel(frame: CGRectMake((15*CGFloat(i)), 100, 20, 20)))
if (strarray[i-1] == newcurrentarray[i-1]){
print("SAME")
labels[i-1].text = String(newcurrentarray[i-1])
labels[i-1].textAlignment = NSTextAlignment.Center
labels[i-1].backgroundColor = UIColor.redColor()
self.view.addSubview(labels[i-1])
} else {
print("CHANGED")
labels[i-1].pushTransition(0.4)
labels[i-1].text = String(newcurrentarray[i-1])
labels[i-1].textAlignment = NSTextAlignment.Center
labels[i-1].backgroundColor = UIColor.redColor()
self.view.addSubview(labels[i-1])
}
}
}
}
}
EDIT
I put label array out of action section and it's fixed.
var labels = [UILabel]()
However, the transition between 100,00 and 99,99 there is a problem with the last child of label array. It still shows last digit like 99,990

Converting MKPolygon Objective-C code to Swift

I have the following Objective-C method:
- (void)addPolygonToMap {
NSInteger numberOfPoints = [self.coordinates count];
if (numberOfPoints > 4) {
CLLocationCoordinate2D points[numberOfPoints];
for (NSInteger i = 0; i < numberOfPoints; i++) {
points[i] = [self.coordinates[i] MKCoordinateValue];
}
self.polygon = [MKPolygon polygonWithCoordinates:points count:numberOfPoints];
[self.mapView addOverlay: self.polygon];
}
self.isDrawingPolygon = NO;
[self.drawPolygonButton setTitle:#"draw" forState:UIControlStateNormal];
self.canvasView.image = nil;
[self.canvasView removeFromSuperview];
}
My attempt at converting it to Swift:
func addPolygonToMap() {
var numberOfPoints: NSInteger = self.coordinates.count
if (numberOfPoints > 4) {
var points: [CLLocationCoordinate2D] = []
var coordsPointer = UnsafeMutablePointer<CLLocationCoordinate2D>.alloc(numberOfPoints)
for i in 0..<numberOfPoints {
points.append(coordsPointer[i])
}
self.polygon = MKPolygon(coordinates: &points, count: numberOfPoints)
self.mapView.addOverlay(self.polygon)
coordsPointer.dealloc(numberOfPoints)
}
self.isDrawingPolygon = false
self.drawPolygonButton.setTitle("Draw", forState: .Normal)
self.canvasView.image = nil
self.canvasView.removeFromSuperview()
}
Finally, when the delegate method is called it's not actually adding the overlay to the mapView. I can't see anything.
I'm assuming it's my self.addPolytonToMap() method, but I'm not 100% sure. The whole scenario works fine in my Objective-C project.
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
if (overlay is MKPolygon) {
var overlayPathView = MKPolygonRenderer(overlay: overlay)
overlayPathView.fillColor = UIColor.cyanColor().colorWithAlphaComponent(0.2)
overlayPathView.strokeColor = UIColor.cyanColor().colorWithAlphaComponent(0.2)
overlayPathView.lineWidth = 5
return overlayPathView
} else if (overlay is MKPolyline) {
var overlayPathView = MKPolylineRenderer(overlay: overlay)
overlayPathView.strokeColor = UIColor.blueColor().colorWithAlphaComponent(0.7)
overlayPathView.lineWidth = 5
return overlayPathView
}
return nil
}
UPDATE:
I just noticed that in my Objective-C version, the points[i].latitude are coming through okay, however when I do the following I get a strange output:
println(coordsPointer[i].latitude)
Output:
1.63041663127611e-321
1.64523860065135e-321
1.65511991356818e-321
1.68970450877706e-321
1.7045264781523e-321
1.72922976044436e-321
This would explain why I don't see the overlay, however my experience with UnsafeMutablePointer<> is limited.
Fixed by modifying the addPolygonToMap() method:
func addPolygonToMap() {
var numberOfPoints: NSInteger = self.coordinates.count
if (numberOfPoints > 4) {
var points: [CLLocationCoordinate2D] = []
for i in 0..<numberOfPoints {
points.insert(self.coordinates[i].MKCoordinateValue, atIndex: i)
}
self.polygon = MKPolygon(coordinates: &points, count: numberOfPoints)
self.mapView.addOverlay(self.polygon)
}
self.isDrawingPolygon = false
self.drawPolygonButton.setTitle("Draw", forState: .Normal)
self.canvasView.image = nil
self.canvasView.removeFromSuperview()
}
Thanks to #Volker for the help.

iOS8 video dimension, CMVideoDimensions returns 0,0

in iOS8 the dimension returned is 0,0
CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
This was working on iOS7, so how to know the supported video dimension, as i need to know the video aspect ratio
You need to wait for the AVCaptureInputPortFormatDescriptionDidChangeNotification
- (void)avCaptureInputPortFormatDescriptionDidChangeNotification:(NSNotification *)notification {
AVCaptureInput *input = [self.recorder.captureSession.inputs objectAtIndex:0];
AVCaptureInputPort *port = [input.ports objectAtIndex:0];
CMFormatDescriptionRef formatDescription = port.formatDescription;
if (formatDescription) {
CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
if ((dimensions.width == 0) || (dimensions.height == 0)) {
return;
}
CGFloat aspect = (CGFloat)dimensions.width / (CGFloat)dimensions.height;
if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1) {
// since iOS8 the aspect ratio is inverted
// remove this check if iOS7 will not be supported
aspect = 1.f / aspect;
}
}
}
Provided you're tracking the device being used, you can access the current format from activeFormat: https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVCaptureDevice_Class/index.html#//apple_ref/occ/instp/AVCaptureDevice/activeFormat
I recently ran into this particular issue, here's the Swift 5 version for those who need it too:
import Foundation
import AVFoundation
class MySessionManager: NSObject {
static let notificationName = "AVCaptureInputPortFormatDescriptionDidChangeNotification"
let session: AVCaptureSession
var videoCaptureDimensions: CMVideoDimensions?
init(session: AVCaptureSession) {
self.session = session
let notificationName = NSNotification.Name()
NotificationCenter.default.addObserver(
self,
selector: #selector(formatDescription(didChange:)),
name: .init(Self.notificationName),
object: nil
)
}
deinit { NotificationCenter.default.removeObserver(self) }
#objc func formatDescription(didChange notification: NSNotification) {
guard
let input = session.inputs.first,
let port = input.ports.first,
let formatDesc = port.formatDescription
else { return }
var dimensions = CMVideoFormatDescriptionGetDimensions(formatDesc)
// ... perform any necessary dim adjustments ...
videoCaptureDimensions = dimensions
}
}