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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| // | ||
| // ISImage.swift | ||
| // KNU_CSE | ||
| // | ||
| // Created by junseok on 2021/08/29. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
||
| public class ISImageView: UIImageView { | ||
| public var isInteractable: Bool = false { | ||
| didSet { | ||
| guard oldValue != isInteractable else { return } | ||
| if isInteractable { | ||
| setupGesture() | ||
| cellForTarget(superview: superview)?.clipsToBounds = false | ||
| isUserInteractionEnabled = true | ||
| pinchGesture.map { addGestureRecognizer($0) } | ||
| panGesture.map { addGestureRecognizer($0) } | ||
| doubleTapGestrue.map {addGestureRecognizer($0)} | ||
| } else { | ||
| pinchGesture.map { removeGestureRecognizer($0) } | ||
| panGesture.map { removeGestureRecognizer($0) } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private var isPinching = false | ||
| private var pinchGesture: UIPinchGestureRecognizer? | ||
| private var panGesture: UIPanGestureRecognizer? | ||
| private var doubleTapGestrue: UITapGestureRecognizer? | ||
| private var originalCenter: CGPoint? | ||
|
|
||
| private func setupGesture() { | ||
| pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(handlePinchGesture(sender:))) | ||
| pinchGesture?.delegate = self | ||
| panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(sender:))) | ||
| panGesture?.delegate = self | ||
| doubleTapGestrue = UITapGestureRecognizer(target: self, action: #selector(reset)) | ||
| doubleTapGestrue?.delegate = self | ||
| doubleTapGestrue?.numberOfTapsRequired = 2 | ||
| } | ||
|
|
||
| private func cellForTarget(superview: UIView?) -> UIView? { | ||
| guard superview != nil else { | ||
| return nil | ||
| } | ||
| if superview is UITableViewCell || superview is UICollectionViewCell { | ||
| return superview | ||
| } else { | ||
| return cellForTarget(superview: superview?.superview) | ||
| } | ||
| } | ||
|
|
||
| @objc private func handlePinchGesture(sender: UIPinchGestureRecognizer) { | ||
| switch sender.state { | ||
| case .began: | ||
| isPinching = sender.scale > 1 | ||
| layer.zPosition = 1 | ||
| cellForTarget(superview: superview)?.layer.zPosition = 1 | ||
| case .changed: | ||
| guard let view = sender.view, isPinching else { return } | ||
| let center = CGPoint(x: sender.location(in: view).x - view.bounds.midX, | ||
| y: sender.location(in: view).y - view.bounds.midY) | ||
| view.transform = view.transform | ||
| .translatedBy(x: center.x, y: center.y) | ||
| .scaledBy(x: sender.scale, y: sender.scale) | ||
| .translatedBy(x: -center.x, y: -center.y) | ||
| sender.scale = 1 | ||
| case .ended, .cancelled, .failed: | ||
| reset() | ||
| break | ||
| default: | ||
| break | ||
| } | ||
| } | ||
|
|
||
| @objc private func handlePanGesture(sender: UIPanGestureRecognizer) { | ||
| switch sender.state { | ||
| case .began where isPinching: | ||
| originalCenter = sender.view?.center | ||
| case .changed where isPinching: | ||
| guard let view = sender.view else { return } | ||
| let translation = sender.translation(in: self) | ||
| view.center = CGPoint(x:view.center.x + translation.x, y:view.center.y + translation.y) | ||
| sender.setTranslation(.zero, in: superview) | ||
| default: | ||
| break | ||
| } | ||
| } | ||
|
|
||
| @objc private func reset() { | ||
| UIView.animate(withDuration: 0.3, animations: { | ||
| self.transform = .identity | ||
| self.center = self.originalCenter ?? self.center | ||
| }) { _ in | ||
| self.isPinching = false | ||
| self.layer.zPosition = 1 | ||
| self.cellForTarget(superview: self.superview)?.layer.zPosition = 1 | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension ISImageView: UIGestureRecognizerDelegate { | ||
| public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool { | ||
| if gestureRecognizer == pinchGesture && otherGestureRecognizer.view is UIScrollView { | ||
| return false | ||
| } | ||
| if gestureRecognizer == panGesture && otherGestureRecognizer.view is UIScrollView { | ||
| return true | ||
| } | ||
| return true | ||
| } | ||
| } |
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