Repo created

iphone/Maps/Classes/Pages/ImageViewCrossDisolve.swift

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+
+class ImageViewCrossDisolve: UIView {
+  private var imageViews: [UIImageView] = []
+  var images: [UIImage?] = [] {
+    didSet{
+      imageViews.forEach { (imageView) in
+        imageView.removeFromSuperview();
+      }
+      for image in images{
+        let imageView = UIImageView(image: image);
+        self.addSubview(imageView)
+        imageView.alpha = 0
+        imageView.contentMode = .scaleAspectFill
+        imageView.translatesAutoresizingMaskIntoConstraints = false;
+        imageView.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
+        imageView.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
+        imageView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
+        imageView.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
+        self.imageViews.append(imageView)
+      }
+      updateLayout()
+    }
+  }
+  var pageCount: Int {
+    return images.count
+  }
+  var currentPage: CGFloat = 0.0 {
+    didSet {
+      updateLayout()
+    }
+  }
+
+  private func updateLayout() {
+    for i in 0..<imageViews.count {
+      let imageView = imageViews[i]
+      let progress:CGFloat = currentPage - CGFloat(i)
+      let alpha = max(CGFloat(0.0), min(CGFloat(1.0), progress+1))
+      imageView.alpha = alpha
+    }
+  }
+
+  override func layoutSubviews() {
+    super.layoutSubviews()
+    updateLayout()
+  }
+}