Ios 轨迹贴图视图旋转
我有一个MapKitView，它有一个指向某个方向的注释。我的问题是，当用户使用两个手指旋转地图时，或者如果地图旋转以跟踪用户的标题，则需要旋转我的符号（因为它们与屏幕对齐，所以不需要旋转） 我知道我可以通过与地图摄影机标题相反的方向旋转符号。 我知道在这种情况下，可以通知我用户标题的更改以旋转注释 我的问题是，由于用户以交互方式旋转地图，我找不到跟踪地图旋转的方法 我可以跟踪贴图区域的开始和结束更改，但不能跟踪两者之间的更改。 我试着用KVO的相机的轴承，但我没有得到任何东西。 我试图查找系统发送的通知，但还是没有Ios 轨迹贴图视图旋转,ios,rotation,mapkit,Ios,Rotation,Mapkit,我有一个MapKitView，它有一个指向某个方向的注释。我的问题是，当用户使用两个手指旋转地图时，或者如果地图旋转以跟踪用户的标题，则需要旋转我的符号（因为它们与屏幕对齐，所以不需要旋转） 我知道我可以通过与地图摄影机标题相反的方向旋转符号。 我知道在这种情况下，可以通知我用户标题的更改以旋转注释 我的问题是，由于用户以交互方式旋转地图，我找不到跟踪地图旋转的方法 我可以跟踪贴图区域的开始和结束更改，但不能跟踪两者之间的更改。 我试着用KVO的相机的轴承，但我没有得到任何东西。 我试图查找系统
有人对如何可靠地跟踪当前地图旋转有什么建议吗？您可以尝试创建一个
CADisplayLink// compassView is the container View,
// arrowImageView is the arrow which will be rotated
@IBOutlet weak var compassView: UIView!
var arrowImageView = UIImageView(image: UIImage(named: "Compass")!)
override func viewDidLoad() {
super.viewDidLoad()
compassView.addSubview(arrowImageView)
}
// ******************************************************************************************
// *
// Helper: Detect when the MapView changes *
private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = mapView!.subviews[0]
// Look through gesture recognizers to determine whether this region
// change is from user interaction
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if( recognizer.state == UIGestureRecognizerState.Began ||
recognizer.state == UIGestureRecognizerState.Ended ) {
return true
}
}
}
return false
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// Helper: Needed to be allowed to recognize gestures simultaneously to the MapView ones. *
func gestureRecognizer(_: UIGestureRecognizer,
shouldRecognizeSimultaneouslyWithGestureRecognizer:UIGestureRecognizer) -> Bool {
return true
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// Helper: Use CADisplayLink to fire a selector at screen refreshes to sync with each *
// frame of MapKit's animation
private var displayLink : CADisplayLink!
func setUpDisplayLink() {
displayLink = CADisplayLink(target: self, selector: "refreshCompassHeading:")
displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSRunLoopCommonModes)
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// Detect if the user starts to interact with the map... *
private var mapChangedFromUserInteraction = false
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
// Map interaction. Set up a CADisplayLink.
setUpDisplayLink()
}
}
// *
// ******************************************************************************************
// *
// ... and when he stops. *
func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
if mapChangedFromUserInteraction {
// Final transform.
// If all calculations would be correct, then this shouldn't be needed do nothing.
// However, if something went wrong, with this final transformation the compass
// always points to the right direction after the interaction is finished.
// Making it a 500 ms animation provides elasticity und prevents hard transitions.
UIView.animateWithDuration(0.5, animations: {
self.arrowImageView.transform =
CGAffineTransformMakeRotation(CGFloat(M_PI * -mapView.camera.heading) / 180.0)
})
// You may want this here to work on a better rotate out equation. :)
let stoptime = NSDate.timeIntervalSinceReferenceDate()
print("Needed time to rotate out:", stoptime - startRotateOut, "with velocity",
remainingVelocityAfterUserInteractionEnded, ".")
print("Velocity decrease per sec:", (Double(remainingVelocityAfterUserInteractionEnded)
/ (stoptime - startRotateOut)))
// Clean up for the next rotation.
remainingVelocityAfterUserInteractionEnded = 0
initialMapGestureModeIsRotation = nil
if let _ = displayLink {
displayLink.invalidate()
}
}
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// This is our main function. The display link calls it once every display frame. *
// The moment the user let go of the map.
var startRotateOut = NSTimeInterval(0)
// After that, if there is still momentum left, the velocity is > 0.
// The velocity of the rotation gesture in radians per second.
private var remainingVelocityAfterUserInteractionEnded = CGFloat(0)
// We need some values from the last frame
private var prevHeading = CLLocationDirection()
private var prevRotationInRadian = CGFloat(0)
private var prevTime = NSTimeInterval(0)
// The momentum gets slower ower time
private var currentlyRemainingVelocity = CGFloat(0)
func refreshCompassHeading(sender: AnyObject) {
// If the gesture mode is not determinated or user is adjusting pitch
// we do obviously nothing here. :)
if initialMapGestureModeIsRotation == nil || !initialMapGestureModeIsRotation! {
return
}
let rotationInRadian : CGFloat
if remainingVelocityAfterUserInteractionEnded == 0 {
// This is the normal case, when the map is beeing rotated.
rotationInRadian = rotationGestureRecognizer.rotation
} else {
// velocity is > 0 or < 0.
// This is the case when the user ended the gesture and there is
// still some momentum left.
let currentTime = NSDate.timeIntervalSinceReferenceDate()
let deltaTime = currentTime - prevTime
// Calculate new remaining velocity here.
// This is only very empiric and leaves room for improvement.
// For instance I noticed that in the middle of the translation
// the needle rotates a bid faster than the map.
let SLOW_DOWN_FACTOR : CGFloat = 1.87
let elapsedTime = currentTime - startRotateOut
// Mathematicians, the next line is for you to play.
currentlyRemainingVelocity -=
currentlyRemainingVelocity * CGFloat(elapsedTime)/SLOW_DOWN_FACTOR
let rotationInRadianSinceLastFrame =
currentlyRemainingVelocity * CGFloat(deltaTime)
rotationInRadian = prevRotationInRadian + rotationInRadianSinceLastFrame
// Remember for the next frame.
prevRotationInRadian = rotationInRadian
prevTime = currentTime
}
// Convert radian to degree and get our long-desired new heading.
let rotationInDegrees = Double(rotationInRadian * (180 / CGFloat(M_PI)))
let newHeading = -mapView!.camera.heading + rotationInDegrees
// No real difference? No expensive transform then.
let difference = abs(newHeading - prevHeading)
if difference < 0.001 {
return
}
// Finally rotate the compass.
arrowImageView.transform =
CGAffineTransformMakeRotation(CGFloat(M_PI * newHeading) / 180.0)
// Remember for the next frame.
prevHeading = newHeading
}
// *
// ******************************************************************************************
// As soon as this optional is set the initial mode is determined.
// If it's true than the map is in rotation mode,
// if false, the map is in 3D position adjust mode.
private var initialMapGestureModeIsRotation : Bool?
// ******************************************************************************************
// *
// UIRotationGestureRecognizer *
@IBAction func handleRotation(sender: UIRotationGestureRecognizer) {
if (initialMapGestureModeIsRotation == nil) {
initialMapGestureModeIsRotation = true
} else if !initialMapGestureModeIsRotation! {
// User is not in rotation mode.
return
}
if sender.state == .Ended {
if sender.velocity != 0 {
// Velocity left after ending rotation gesture. Decelerate from remaining
// momentum. This block is only called once.
remainingVelocityAfterUserInteractionEnded = sender.velocity
currentlyRemainingVelocity = remainingVelocityAfterUserInteractionEnded
startRotateOut = NSDate.timeIntervalSinceReferenceDate()
prevTime = startRotateOut
prevRotationInRadian = rotationGestureRecognizer.rotation
}
}
}
// *
// ******************************************************************************************
// *
// Yes, there is also a SwypeGestureRecognizer, but the length for being recognized as *
// is far too long. Recognizing a 2 finger swype up or down with a PanGestureRecognizer
// yields better results.
@IBAction func handleSwipe(sender: UIPanGestureRecognizer) {
// After a certain altitude is reached, there is no pitch possible.
// In this case the 3D perspective change does not work and the rotation is initialized.
// Play with this one.
let MAX_PITCH_ALTITUDE : Double = 100000
// Play with this one for best results detecting a swype. The 3D perspective change is
// recognized quite quickly, thats the reason a swype recognizer here is of no use.
let SWYPE_SENSITIVITY : CGFloat = 0.5 // play with this one
if let _ = initialMapGestureModeIsRotation {
// Gesture mode is already determined.
// Swypes don't care us anymore.
return
}
if mapView?.camera.altitude > MAX_PITCH_ALTITUDE {
// Altitude is too high to adjust pitch.
return
}
let panned = sender.translationInView(mapView)
if fabs(panned.y) > SWYPE_SENSITIVITY {
// Initial swype up or down.
// Map gesture is most likely a 3D perspective correction.
initialMapGestureModeIsRotation = false
}
}
// *
// ******************************************************************************************
// *
@IBAction func pinchGestureRecognizer(sender: UIPinchGestureRecognizer) {
// pinch is zoom. this always enables rotation mode.
if (initialMapGestureModeIsRotation == nil) {
initialMapGestureModeIsRotation = true
// Initial pinch detected. This is normally a zoom
// which goes in hand with a rotation.
}
}
// *
// ******************************************************************************************
//compassView是容器视图，
//arrowImageView是将要旋转的箭头
@IBVAR compassView:UIView！
var arrowImageView=UIImageView（图像：UIImage（名为：“指南针”）！）
重写func viewDidLoad（）{
super.viewDidLoad（）
compassView.addSubview（箭头图像视图）
}
// ******************************************************************************************
// *
//辅助对象：在地图视图更改时检测*
private func mapViewRegionDidChangeFromUserInteraction（）->Bool{
让视图=地图视图！。子视图[0]
//查看手势识别器以确定此区域
//变化来自用户交互
如果让gestureRecognizers=view.gestureRecognizers{
用于手势识别器中的识别器{
如果（recognizer.state==UIgestureCongnizerState.Start）||
recognizer.state==UIGestureRecognizerState.Ended）{
返回真值
}
}
}
返回错误
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
//助手：需要允许同时识别MapView中的手势*
func gestureRecognizer（uquo:UIGestureRecognizer，
应使用手势识别器同时识别：UIGestureRecognizer）->Bool{
返回真值
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
//助手：使用CADisplayLink在屏幕刷新时触发选择器，以与每个屏幕同步*
//MapKit动画的帧
私有变量显示链接：CADisplayLink！
func setUpDisplayLink（）{
displayLink=CADisplayLink（目标：self，选择器：“refreshCompassHeading:”）
displayLink.addToRunLoop（NSRunLoop.currentRunLoop（），forMode:NSRunLoopCommonModes）
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
//检测用户是否开始与地图交互*
私有变量mapChangedFromUserInteraction=false
func地图视图（地图视图：MKMapView，区域将更改动画：Bool）{
mapChangedFromUserInteraction=mapViewRegionDidChangeFromUserInteraction（）
if（mapChangedFromUserInteraction）{
//地图交互。设置CADisplayLink。
@IBAction func handleRotation(sender: UIRotationGestureRecognizer) {
...
}
@IBAction func handleSwipe(sender: UIPanGestureRecognizer) {
...
}
@IBAction func pinchGestureRecognizer(sender: UIPinchGestureRecognizer) {
...
}
// compassView is the container View,
// arrowImageView is the arrow which will be rotated
@IBOutlet weak var compassView: UIView!
var arrowImageView = UIImageView(image: UIImage(named: "Compass")!)
override func viewDidLoad() {
super.viewDidLoad()
compassView.addSubview(arrowImageView)
}
// ******************************************************************************************
// *
// Helper: Detect when the MapView changes *
private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = mapView!.subviews[0]
// Look through gesture recognizers to determine whether this region
// change is from user interaction
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if( recognizer.state == UIGestureRecognizerState.Began ||
recognizer.state == UIGestureRecognizerState.Ended ) {
return true
}
}
}
return false
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// Helper: Needed to be allowed to recognize gestures simultaneously to the MapView ones. *
func gestureRecognizer(_: UIGestureRecognizer,
shouldRecognizeSimultaneouslyWithGestureRecognizer:UIGestureRecognizer) -> Bool {
return true
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// Helper: Use CADisplayLink to fire a selector at screen refreshes to sync with each *
// frame of MapKit's animation
private var displayLink : CADisplayLink!
func setUpDisplayLink() {
displayLink = CADisplayLink(target: self, selector: "refreshCompassHeading:")
displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSRunLoopCommonModes)
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// Detect if the user starts to interact with the map... *
private var mapChangedFromUserInteraction = false
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
if (mapChangedFromUserInteraction) {
// Map interaction. Set up a CADisplayLink.
setUpDisplayLink()
}
}
// *
// ******************************************************************************************
// *
// ... and when he stops. *
func mapView(mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
if mapChangedFromUserInteraction {
// Final transform.
// If all calculations would be correct, then this shouldn't be needed do nothing.
// However, if something went wrong, with this final transformation the compass
// always points to the right direction after the interaction is finished.
// Making it a 500 ms animation provides elasticity und prevents hard transitions.
UIView.animateWithDuration(0.5, animations: {
self.arrowImageView.transform =
CGAffineTransformMakeRotation(CGFloat(M_PI * -mapView.camera.heading) / 180.0)
})
// You may want this here to work on a better rotate out equation. :)
let stoptime = NSDate.timeIntervalSinceReferenceDate()
print("Needed time to rotate out:", stoptime - startRotateOut, "with velocity",
remainingVelocityAfterUserInteractionEnded, ".")
print("Velocity decrease per sec:", (Double(remainingVelocityAfterUserInteractionEnded)
/ (stoptime - startRotateOut)))
// Clean up for the next rotation.
remainingVelocityAfterUserInteractionEnded = 0
initialMapGestureModeIsRotation = nil
if let _ = displayLink {
displayLink.invalidate()
}
}
}
// *
// ******************************************************************************************
// ******************************************************************************************
// *
// This is our main function. The display link calls it once every display frame. *
// The moment the user let go of the map.
var startRotateOut = NSTimeInterval(0)
// After that, if there is still momentum left, the velocity is > 0.
// The velocity of the rotation gesture in radians per second.
private var remainingVelocityAfterUserInteractionEnded = CGFloat(0)
// We need some values from the last frame
private var prevHeading = CLLocationDirection()
private var prevRotationInRadian = CGFloat(0)
private var prevTime = NSTimeInterval(0)
// The momentum gets slower ower time
private var currentlyRemainingVelocity = CGFloat(0)
func refreshCompassHeading(sender: AnyObject) {
// If the gesture mode is not determinated or user is adjusting pitch
// we do obviously nothing here. :)
if initialMapGestureModeIsRotation == nil || !initialMapGestureModeIsRotation! {
return
}
let rotationInRadian : CGFloat
if remainingVelocityAfterUserInteractionEnded == 0 {
// This is the normal case, when the map is beeing rotated.
rotationInRadian = rotationGestureRecognizer.rotation
} else {
// velocity is > 0 or < 0.
// This is the case when the user ended the gesture and there is
// still some momentum left.
let currentTime = NSDate.timeIntervalSinceReferenceDate()
let deltaTime = currentTime - prevTime
// Calculate new remaining velocity here.
// This is only very empiric and leaves room for improvement.
// For instance I noticed that in the middle of the translation
// the needle rotates a bid faster than the map.
let SLOW_DOWN_FACTOR : CGFloat = 1.87
let elapsedTime = currentTime - startRotateOut
// Mathematicians, the next line is for you to play.
currentlyRemainingVelocity -=
currentlyRemainingVelocity * CGFloat(elapsedTime)/SLOW_DOWN_FACTOR
let rotationInRadianSinceLastFrame =
currentlyRemainingVelocity * CGFloat(deltaTime)
rotationInRadian = prevRotationInRadian + rotationInRadianSinceLastFrame
// Remember for the next frame.
prevRotationInRadian = rotationInRadian
prevTime = currentTime
}
// Convert radian to degree and get our long-desired new heading.
let rotationInDegrees = Double(rotationInRadian * (180 / CGFloat(M_PI)))
let newHeading = -mapView!.camera.heading + rotationInDegrees
// No real difference? No expensive transform then.
let difference = abs(newHeading - prevHeading)
if difference < 0.001 {
return
}
// Finally rotate the compass.
arrowImageView.transform =
CGAffineTransformMakeRotation(CGFloat(M_PI * newHeading) / 180.0)
// Remember for the next frame.
prevHeading = newHeading
}
// *
// ******************************************************************************************
// As soon as this optional is set the initial mode is determined.
// If it's true than the map is in rotation mode,
// if false, the map is in 3D position adjust mode.
private var initialMapGestureModeIsRotation : Bool?
// ******************************************************************************************
// *
// UIRotationGestureRecognizer *
@IBAction func handleRotation(sender: UIRotationGestureRecognizer) {
if (initialMapGestureModeIsRotation == nil) {
initialMapGestureModeIsRotation = true
} else if !initialMapGestureModeIsRotation! {
// User is not in rotation mode.
return
}
if sender.state == .Ended {
if sender.velocity != 0 {
// Velocity left after ending rotation gesture. Decelerate from remaining
// momentum. This block is only called once.
remainingVelocityAfterUserInteractionEnded = sender.velocity
currentlyRemainingVelocity = remainingVelocityAfterUserInteractionEnded
startRotateOut = NSDate.timeIntervalSinceReferenceDate()
prevTime = startRotateOut
prevRotationInRadian = rotationGestureRecognizer.rotation
}
}
}
// *
// ******************************************************************************************
// *
// Yes, there is also a SwypeGestureRecognizer, but the length for being recognized as *
// is far too long. Recognizing a 2 finger swype up or down with a PanGestureRecognizer
// yields better results.
@IBAction func handleSwipe(sender: UIPanGestureRecognizer) {
// After a certain altitude is reached, there is no pitch possible.
// In this case the 3D perspective change does not work and the rotation is initialized.
// Play with this one.
let MAX_PITCH_ALTITUDE : Double = 100000
// Play with this one for best results detecting a swype. The 3D perspective change is
// recognized quite quickly, thats the reason a swype recognizer here is of no use.
let SWYPE_SENSITIVITY : CGFloat = 0.5 // play with this one
if let _ = initialMapGestureModeIsRotation {
// Gesture mode is already determined.
// Swypes don't care us anymore.
return
}
if mapView?.camera.altitude > MAX_PITCH_ALTITUDE {
// Altitude is too high to adjust pitch.
return
}
let panned = sender.translationInView(mapView)
if fabs(panned.y) > SWYPE_SENSITIVITY {
// Initial swype up or down.
// Map gesture is most likely a 3D perspective correction.
initialMapGestureModeIsRotation = false
}
}
// *
// ******************************************************************************************
// *
@IBAction func pinchGestureRecognizer(sender: UIPinchGestureRecognizer) {
// pinch is zoom. this always enables rotation mode.
if (initialMapGestureModeIsRotation == nil) {
initialMapGestureModeIsRotation = true
// Initial pinch detected. This is normally a zoom
// which goes in hand with a rotation.
}
}
// *
// ******************************************************************************************
class MyMap : MKMapView {
}
class MyMap : MKMapView {
var mapContainerView : UIView?
init() {
...
self.mapContainerView = self.findViewOfType("MKScrollContainerView", inView: self)
...
}
func findViewOfType(type: String, inView view: UIView) -> UIView? {
// function scans subviews recursively and returns reference to the found one of a type
if view.subviews.count > 0 {
for v in view.subviews {
if v.dynamicType.description() == type {
return v
}
if let inSubviews = self.findViewOfType(type, inView: v) {
return inSubviews
}
}
return nil
} else {
return nil
}
}
}
cosA sinA 0
-sinA cosA 0
0 0 1
class MyMap : MKMapView {
...
func getRotation() -> Double? {
// function gets current map rotation based on the transform values of MKScrollContainerView
if self.mapContainerView != nil {
var rotation = fabs(180 * asin(Double(self.mapContainerView!.transform.b)) / M_PI)
if self.mapContainerView!.transform.b <= 0 {
if self.mapContainerView!.transform.a >= 0 {
// do nothing
} else {
rotation = 180 - rotation
}
} else {
if self.mapContainerView!.transform.a <= 0 {
rotation = rotation + 180
} else {
rotation = 360 - rotation
}
}
return rotation
} else {
return nil
}
}
...
}
@objc protocol MyMapListener {
optional func onRotationChanged(rotation rotation: Double)
// message is sent when map rotation is changed
}
class MyMap : MKMapView {
...
var changesTimer : NSTimer? // timer to track map changes; nil when changes are not tracked
var listener : MyMapListener?
var rotation : Double = 0 // value to track rotation changes
...
func trackChanges() {
// function detects map changes and processes it
if let rotation = self.getRotation() {
if rotation != self.rotation {
self.rotation = rotation
self.listener?.onRotationChanged(rotation: rotation)
}
}
}
func startTrackingChanges() {
// function starts tracking map changes
if self.changesTimer == nil {
self.changesTimer = NSTimer(timeInterval: 0.1, target: self, selector: #selector(MyMap.trackChanges), userInfo: nil, repeats: true)
NSRunLoop.currentRunLoop().addTimer(self.changesTimer!, forMode: NSRunLoopCommonModes)
}
}
func stopTrackingChanges() {
// function stops tracking map changes
if self.changesTimer != nil {
self.changesTimer!.invalidate()
self.changesTimer = nil
}
}
}
protocol MyMapViewRotationDelegate:class {
func myMapView(mapView: MyMapView, didRotateAtAngle angle:CGFloat)
}
class MyMapView: MKMapView {
private var mapContainerView:UIView?
weak var rotationDelegate:MyMapViewRotationDelegate?
}
private func findViewOfType(type: String, inView view: UIView) -> UIView? {
// function scans subviews recursively and returns reference to the found one of a type
if view.subviews.count > 0 {
for v in view.subviews {
if v.classForCoder == NSClassFromString("MKScrollContainerView") {
return v
}
if let inSubviews = self.findViewOfType(type: type, inView: v) {
return inSubviews
}
}
return nil
} else {
return nil
}
}
override func awakeFromNib() {
super.awakeFromNib()
if let scrollContainerView = findViewOfType(type: "MKScrollContainerView", inView: self) {
mapContainerView = scrollContainerView
mapContainerView!.layer.addObserver(self, forKeyPath: #keyPath(transform), options: [.new, .old], context: nil)
}
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
guard keyPath == #keyPath(transform) else {
super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
return
}
guard let layer = object as? CALayer else {
return
}
if let rotationRadians = layer.value(forKeyPath: "transform.rotation.z") as? CGFloat {
var angle = rotationRadians / .pi * 180 //convert to degrees
if angle < 0 {
angle = 360 + angle
}
if let rotationDelegate = rotationDelegate {
rotationDelegate.myMapView(mapView: self, didRotateAtAngle: angle)
}
}
}
deinit {
mapContainerView?.layer.removeObserver(self, forKeyPath: #keyPath(transform))
}