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class Animator {
var view = UIView()
lazy var dropZone = self.makeDropZone()
var dragImageView: UIImageView?
var startPoint = CGPoint.zero
var recognizer: UILongPressGestureRecognizer?
private func makeDropZone() -> UIView {
let dropZoneEdge = 250
let dropZoneMissingEdge: CGFloat = 50
let view = UIView(frame: CGRect(x: -dropZoneEdge,
y: Int(screenHeight) + dropZoneEdge,
width: dropZoneEdge, height: dropZoneEdge))
view.createRoundCorner(125)
view.backgroundColor = .black
let label = knUIMaker.makeLabel(text: "\nDrop here\nto download", font: UIFont.boldSystemFont(ofSize: 18), color: .white, numberOfLines: 0)
label.tag = 1001
label.translatesAutoresizingMaskIntoConstraints = true
view.addSubviews(views: label)
label.frame = CGRect(x: Int(dropZoneMissingEdge) + 24,
y: -25,
width: dropZoneEdge - Int(dropZoneMissingEdge) - 16,
height: dropZoneEdge)
return view
}
private func animateDropZone(visible: Bool) {
let dropZoneEdge = 250
let dropZoneMissingEdge: CGFloat = 50
view.bringSubview(toFront: dropZone)
if visible == true {
UIView.animate(withDuration: 0.2, animations: { [weak self] in
self?.dropZone.frame = CGRect(x: -Int(dropZoneMissingEdge),
y: Int(screenHeight) - dropZoneEdge + Int(dropZoneMissingEdge),
width: dropZoneEdge, height: dropZoneEdge)
})
}
else {
UIView.animate(withDuration: 0.2, animations: { [weak self] in
self?.dropZone.frame = CGRect(x: -dropZoneEdge,
y: Int(screenHeight) + dropZoneEdge,
width: dropZoneEdge, height: dropZoneEdge)
})
}
}
private func zoomDropZone(bigger: Bool) {
let dropZoneEdge = 250
let dropZoneMissingEdge: CGFloat = 50
let yPosition = screenHeight - CGFloat(dropZoneEdge) + dropZoneMissingEdge - 50.0
UIView.animate(withDuration: 0.2, animations: { [weak self] in
guard let dropZone = self?.dropZone, let label = dropZone.viewWithTag(1001) else { return }
if bigger == true {
dropZone.createRoundCorner(CGFloat((dropZoneEdge + 100) / 2))
dropZone.frame = CGRect(x: -Int(dropZoneMissingEdge),
y: Int(yPosition),
width: dropZoneEdge + 100, height: dropZoneEdge + 100)
label.frame.origin.y = 25
}
else {
dropZone.createRoundCorner(CGFloat(dropZoneEdge) / 2)
dropZone.frame = CGRect(x: -Int(dropZoneMissingEdge),
y: Int(screenHeight - CGFloat(dropZoneEdge) + dropZoneMissingEdge),
width: dropZoneEdge, height: dropZoneEdge)
label.frame.origin.y = -25
}
})
}
func detectDownloading() {
guard let recognizer = recognizer, let imageView = recognizer.view?.viewWithTag(1001) as? UIImageView else { return }
switch recognizer.state {
case .began:
dragImageView = cloneImageView(from: imageView)
view.addSubviews(views: dragImageView!)
dragImageView!.frame = changeFrameToView(from: imageView)
startPoint = locationInView(from: recognizer)
zoom(view: dragImageView!, to: 1.02)
case .changed:
guard let dragImageView = dragImageView else { return }
let newPoint = locationInView(from: recognizer)
if newPoint == startPoint { return }
zoom(view: dragImageView, to: 0.5)
dragImageView.center = newPoint
animateDropZone(visible: true)
if checkContain(bigView: dragImageView, smallView: dropZone) {
zoomDropZone(bigger: true)
}
else {
zoomDropZone(bigger: false)
}
case .ended:
guard let dragImageView = dragImageView else { return }
if (checkContain(bigView: dragImageView, smallView: dropZone)) {
if let image = dragImageView.image {
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}
animateImageWhenDownload()
animateDropZone(visible: false)
} else {
print("Cancel download")
let originalFrame = changeFrameToView(from: imageView)
animateImageWhenCancel(to: originalFrame)
animateDropZone(visible: false)
}
default:
return
}
}
private func animateImageWhenDownload() {
guard let imageView = dragImageView else { return }
UIView.animate(withDuration: 0.2,
animations: {
imageView.alpha = 0
imageView.frame.origin.y = screenHeight + 10
}, completion: { _ in imageView.removeFromSuperview() })
}
private func animateImageWhenCancel(to frame: CGRect) {
guard let imageView = dragImageView else { return }
UIView.animate(withDuration: 0.2,
animations: {
imageView.frame = frame },
completion: { _ in
imageView.removeFromSuperview()
})
}
private func checkContain(bigView: UIView, smallView: UIView) -> Bool {
return bigView.frame.intersects(smallView.frame) || smallView.frame.intersects(bigView.frame)
}
private func cloneImageView(from imageView: UIImageView) -> UIImageView {
let iv = knUIMaker.makeImageView(image: imageView.image, contentMode: imageView.contentMode)
iv.translatesAutoresizingMaskIntoConstraints = true
return iv
}
private func changeFrameToView(from childView: UIView) -> CGRect {
return childView.convert(childView.frame, to: view) }
private func locationInView(from gesture: UILongPressGestureRecognizer) -> CGPoint {
return gesture.location(in: view) }
private func zoom(view: UIView, to level: CGFloat) {
UIView.animate(withDuration: 0.2, animations: {
view.transform = CGAffineTransform(scaleX: level, y: level)
})
}
}
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