extension ImageDetailVC {
static var instance: ImageDetailVC {
return UIStoryboard(name: "ImageDetailVC", bundle: nil)
.instantiateViewController(withIdentifier: "ImageDetailVC") as! ImageDetailVC
}
}
class ImageDetailVC: ViewController {
@IBOutlet private weak var scrollView: UIScrollView!
private var imageView: UIImageView!
var image: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
initDoubleTapGesture()
initImageView()
}
private func initDoubleTapGesture() {
let tap = UITapGestureRecognizer(target: self, action: #selector(doubleTap(_:)))
tap.numberOfTapsRequired = 2
scrollView.addGestureRecognizer(tap)
}
@objc private func doubleTap(_ gesture: UITapGestureRecognizer) {
if self.scrollView.zoomScale == 1 {
zoom(to: gesture.location(in: imageView))
} else {
UIView.animate(withDuration: 0.3) {
self.scrollView.zoomScale = 1
}
}
}
private func zoom(to point: CGPoint) {
let width = scrollView.bounds.width / 3
let height = scrollView.bounds.height / 3
let x = point.x - width / 2
let y = point.y - height / 2
let frame = CGRect(x: x, y: y, width: width, height: height)
scrollView.zoom(to: frame, animated: true)
}
private func initImageView() {
imageView = UIImageView(image: image)
imageView.contentMode = .scaleAspectFit
scrollView.addSubview(imageView)
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
imageScale()
}
}
extension ImageDetailVC: UIScrollViewDelegate {
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return imageView
}
func scrollViewDidZoom(_ scrollView: UIScrollView) {
imageScale(at: scrollView.zoomScale)
}
private func imageScale(at zoom: CGFloat = 1) {
let ratioSize = AVMakeRect(aspectRatio: image.size, insideRect: scrollView.bounds).size
let width = ratioSize.width * zoom
let height = ratioSize.height * zoom
let x = (scrollView.bounds.width - width) / 2
let y = (scrollView.bounds.height - height) / 2
imageView.frame = CGRect(x: max(0, x), y: max(0, y), width: width, height: height)
}
}
extension ImageDetailVC {
@IBAction private func save(_ sender: UIBarButtonItem) {
PHPhotoLibrary.requestAuthorization { status in
DispatchQueue.main.async {
if status == .authorized {
UIImageWriteToSavedPhotosAlbum(self.image, self, #selector(self.saved(_:error:info:)), nil)
} else {
Util.privacyAlert(msg: .album) // 설정 요청 알림
}
}
}
}
@objc private func saved(_ image: UIImage, error: NSError?, info: UnsafeRawPointer) {
if let error = error {AlertBar.show(error.localizedDescription)}
else {AlertBar.show(.photoSaved)} // 사진 저장 알림
}
}
