Fix double-tap to zoom in gallery not working

Closes #256

Tusker/Screens/Large Image/LargeImageContentView.swift

@@ -14,6 +14,7 @@ import VisionKit
 protocol LargeImageContentView: UIView {
     var animationImage: UIImage? { get }
     var activityItemsForSharing: [Any] { get }
+    var owner: LargeImageViewController? { get set }
     func setControlsVisible(_ controlsVisible: Bool)
     func grayscaleStateChanged()
 }
@@ -29,17 +30,14 @@ class LargeImageImageContentView: UIImageView, LargeImageContentView {
     #endif
     
     var animationImage: UIImage? { image! }
-    
     var activityItemsForSharing: [Any] {
         [image!]
     }
+    weak var owner: LargeImageViewController?
     
     private var sourceData: Data?
-    private weak var owner: UIViewController?
     
-    init(image: UIImage, owner: UIViewController?) {
-        self.owner = owner
-        
+    init(image: UIImage) {
         super.init(image: image)
         
         contentMode = .scaleAspectFit
@@ -109,11 +107,11 @@ extension LargeImageImageContentView: ImageAnalysisInteractionDelegate {
 
 class LargeImageGifContentView: GIFImageView, LargeImageContentView {
     var animationImage: UIImage? { image }
-    
     var activityItemsForSharing: [Any] {
         // todo: should gifs share the data?
         [image].compactMap { $0 }
     }
+    weak var owner: LargeImageViewController?
     
     init(gifController: GIFController) {
         super.init(image: gifController.lastFrame?.image)
@@ -144,6 +142,7 @@ class LargeImageGifvContentView: GifvAttachmentView, LargeImageContentView {
         // some SO posts indicate that just sharing a URL to the video should work, but that may need to be a local URL?
         []
     }
+    weak var owner: LargeImageViewController?
     
     private let asset: AVURLAsset
     

Tusker/Screens/Large Image/LargeImageViewController.swift

@@ -103,15 +103,19 @@ class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeIma
             dismissInteractionController = LargeImageInteractionController(viewController: self)
         }
         
-        view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(scrollViewPressed(_:))))
+        let singleTap = UITapGestureRecognizer(target: self, action: #selector(scrollViewPressed(_:)))
         let doubleTap = UITapGestureRecognizer(target: self, action: #selector(scrollViewDoubleTapped(_:)))
         doubleTap.numberOfTapsRequired = 2
+        // this requirement is needed to make sure the double tap is ever recognized
+        singleTap.require(toFail: doubleTap)
+        view.addGestureRecognizer(singleTap)
         view.addGestureRecognizer(doubleTap)
         
         NotificationCenter.default.addObserver(self, selector: #selector(preferencesChanged), name: .preferencesChanged, object: nil)
     }
     
     private func setupContentView() {
+        contentView.owner = self
         contentView.translatesAutoresizingMaskIntoConstraints = false
         scrollView.addSubview(contentView)
         contentViewLeadingConstraint = contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor)

Tusker/Screens/Large Image/LoadingLargeImageViewController.swift

@@ -138,9 +138,9 @@ class LoadingLargeImageViewController: UIViewController, LargeImageAnimatableVie
             content = LargeImageGifContentView(gifController: gifController)
         } else {
             if let transformedImage = ImageGrayscalifier.convertIfNecessary(url: url, image: image) {
-                content = LargeImageImageContentView(image: transformedImage, owner: self)
+                content = LargeImageImageContentView(image: transformedImage)
             } else {
-                content = LargeImageImageContentView(image: image, owner: self)
+                content = LargeImageImageContentView(image: image)
             }
         }
         
@@ -167,7 +167,7 @@ class LoadingLargeImageViewController: UIViewController, LargeImageAnimatableVie
            let grayscale = ImageGrayscalifier.convert(url: nil, cgImage: source) {
             image = grayscale
         }
-        setContent(LargeImageImageContentView(image: image, owner: self))
+        setContent(LargeImageImageContentView(image: image))
     }
     
 }

Tusker/Screens/Timeline/TimelineGapCollectionViewCell.swift

@@ -44,6 +44,7 @@ class TimelineGapCollectionViewCell: UICollectionViewCell {
         let label = UILabel()
         label.text = "Load more"
         label.font = .preferredFont(forTextStyle: .headline)
+        label.adjustsFontForContentSizeCategory = true
         label.textColor = .tintColor
         
         chevronView.update(direction: .above)

Tusker/Screens/Utilities/CustomAlertController.swift

@@ -357,6 +357,7 @@ class CustomAlertActionButton: UIControl {
         titleView = UIStackView()
         titleView.axis = .horizontal
         titleView.spacing = 4
+        titleView.alignment = .center
         
         if let title = action.title {
             let label = UILabel()

Tusker/Views/Toast/ToastConfiguration.swift

@@ -11,7 +11,7 @@ import Pachyderm
 
 struct ToastConfiguration {
     var systemImageName: String?
-    var titleFont: UIFont = .boldSystemFont(ofSize: 14)
+    var titleFont: UIFont = UIFontMetrics(forTextStyle: .body).scaledFont(for: .boldSystemFont(ofSize: 14))
     var title: String
     var subtitle: String?
     var actionTitle: String?

Tusker/Views/Toast/ToastView.swift

@@ -68,13 +68,15 @@ class ToastView: UIView {
         titleLabel.textColor = .white
         titleLabel.font = configuration.titleFont
         titleLabel.adjustsFontSizeToFitWidth = true
+        titleLabel.adjustsFontForContentSizeCategory = true
         
         if let subtitle = configuration.subtitle {
             let subtitleLabel = UILabel()
             subtitleLabel.text = subtitle
             subtitleLabel.textColor = .white
             subtitleLabel.numberOfLines = 0
-            subtitleLabel.font = .systemFont(ofSize: 14)
+            subtitleLabel.font = UIFontMetrics(forTextStyle: .body).scaledFont(for: .systemFont(ofSize: 14))
+            subtitleLabel.adjustsFontForContentSizeCategory = true
             let vStack = UIStackView(arrangedSubviews: [
                 titleLabel,
                 subtitleLabel
@@ -89,7 +91,8 @@ class ToastView: UIView {
         if let actionTitle = configuration.actionTitle {
             let actionLabel = UILabel()
             actionLabel.text = actionTitle
-            actionLabel.font = .boldSystemFont(ofSize: 16)
+            actionLabel.font = UIFontMetrics(forTextStyle: .body).scaledFont(for: .boldSystemFont(ofSize: 16))
+            actionLabel.adjustsFontForContentSizeCategory = true
             actionLabel.textColor = .white
             stack.addArrangedSubview(actionLabel)
         }