Improve NCMediaCommandView transparency

- adjust to a11y settings
- more contrast overall

Signed-off-by: Henrik Storch <henrik.storch@nextcloud.com>

iOSClient/Media/NCMedia.swift

@@ -725,10 +725,11 @@ class NCMediaCommandView: UIView {
         moreView.layer.masksToBounds = true
         controlButtonView.layer.cornerRadius = 20
         controlButtonView.layer.masksToBounds = true
+        controlButtonView.effect = UIBlurEffect(style: .dark)
         gradient.frame = bounds
-        gradient.startPoint = CGPoint(x: 0, y: 0.50)
-        gradient.endPoint = CGPoint(x: 0, y: 0.9)
-        gradient.colors = [UIColor.black.withAlphaComponent(0.4).cgColor, UIColor.clear.cgColor]
+        gradient.startPoint = CGPoint(x: 0, y: 0.5)
+        gradient.endPoint = CGPoint(x: 0, y: 1)
+        gradient.colors = [UIColor.black.withAlphaComponent(UIAccessibility.isReduceTransparencyEnabled ? 0.8 : 0.4).cgColor, UIColor.clear.cgColor]
         layer.insertSublayer(gradient, at: 0)
         moreButton.setImage(UIImage(named: "more")!.image(color: .white, size: 25), for: .normal)
         title.text = ""
@@ -743,7 +744,7 @@ class NCMediaCommandView: UIView {
             }
         } else {
             UIView.animate(withDuration: 0.3) {
-                self.moreView.effect = UIBlurEffect(style: .regular)
+                self.moreView.effect = UIBlurEffect(style: .dark)
                 self.gradient.isHidden = false
                 self.controlButtonView.isHidden = false
             }