[LayoutSpecExamples] Added swift counterpart. (#2576)

* [LayoutSpecExamples] Added swift counterpart.

* Fixed copyright text.

examples/LayoutSpecExamples-Swift/Sample/LayoutExampleNode.swift

@@ -0,0 +1,145 @@
+//
+//  LayoutExampleNode.swift
+//  Sample
+//
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+//  FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+//  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+//  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import AsyncDisplayKit
+
+class LayoutExampleNode: ASDisplayNode {
+  override required init() {
+    super.init()
+    automaticallyManagesSubnodes = true
+    backgroundColor = .white
+  }
+
+  class func title() -> String {
+    assertionFailure("All layout example nodes must provide a title!")
+    return ""
+  }
+
+  class func descriptionTitle() -> String? {
+    return nil
+  }
+}
+
+class HeaderWithRightAndLeftItems : LayoutExampleNode {
+  let userNameNode     = ASTextNode()
+  let postLocationNode = ASTextNode()
+  let postTimeNode     = ASTextNode()
+
+  required init() {
+    super.init()
+
+    userNameNode.attributedText = NSAttributedString.attributedString(string: "hannahmbanana", fontSize: 20, color: .darkBlueColor())
+    userNameNode.maximumNumberOfLines = 1
+    userNameNode.truncationMode = .byTruncatingTail
+
+    postLocationNode.attributedText = NSAttributedString.attributedString(string: "Sunset Beach, San Fransisco, CA", fontSize: 20, color: .lightBlueColor())
+    postLocationNode.maximumNumberOfLines = 1
+    postLocationNode.truncationMode = .byTruncatingTail
+
+    postTimeNode.attributedText = NSAttributedString.attributedString(string: "30m", fontSize: 20, color: .lightGray)
+    postTimeNode.maximumNumberOfLines = 1
+    postTimeNode.truncationMode = .byTruncatingTail
+  }
+
+  override class func title() -> String {
+    return "Header with left and right justified text"
+  }
+
+  override class func descriptionTitle() -> String? {
+    return "try rotating me!"
+  }
+}
+
+class PhotoWithInsetTextOverlay : LayoutExampleNode {
+  let photoNode = ASNetworkImageNode()
+  let titleNode = ASTextNode()
+
+  required init() {
+    super.init()
+
+    backgroundColor = .clear
+
+    photoNode.url = URL(string: "http://asyncdisplaykit.org/static/images/layout-examples-photo-with-inset-text-overlay-photo.png")
+    photoNode.willDisplayNodeContentWithRenderingContext = { context in
+      let bounds = context.boundingBoxOfClipPath
+      UIBezierPath(roundedRect: bounds, cornerRadius: 10).addClip()
+    }
+
+    titleNode.attributedText = NSAttributedString.attributedString(string: "family fall hikes", fontSize: 16, color: .white)
+    titleNode.truncationAttributedText = NSAttributedString.attributedString(string: "...", fontSize: 16, color: .white)
+    titleNode.maximumNumberOfLines = 2
+    titleNode.truncationMode = .byTruncatingTail
+  }
+
+  override class func title() -> String {
+    return "Photo with inset text overlay"
+  }
+
+  override class func descriptionTitle() -> String? {
+    return "try rotating me!"
+  }
+}
+
+class PhotoWithOutsetIconOverlay : LayoutExampleNode {
+  let photoNode = ASNetworkImageNode()
+  let iconNode  = ASNetworkImageNode()
+
+  required init() {
+    super.init()
+
+    photoNode.url = URL(string: "http://asyncdisplaykit.org/static/images/layout-examples-photo-with-outset-icon-overlay-photo.png")
+
+    iconNode.url = URL(string: "http://asyncdisplaykit.org/static/images/layout-examples-photo-with-outset-icon-overlay-icon.png")
+
+    iconNode.imageModificationBlock = { image in
+      let profileImageSize = CGSize(width: 60, height: 60)
+      return image.makeCircularImage(size: profileImageSize, borderWidth: 10)
+    }
+  }
+
+  override class func title() -> String {
+    return "Photo with outset icon overlay"
+  }
+
+  override class func descriptionTitle() -> String? {
+    return nil
+  }
+}
+
+class FlexibleSeparatorSurroundingContent : LayoutExampleNode {
+  let topSeparator    = ASImageNode()
+  let bottomSeparator = ASImageNode()
+  let textNode        = ASTextNode()
+
+  required init() {
+    super.init()
+
+    topSeparator.image = UIImage.as_resizableRoundedImage(withCornerRadius: 1.0, cornerColor: .black, fill: .black)
+
+    textNode.attributedText = NSAttributedString.attributedString(string: "this is a long text node", fontSize: 16, color: .black)
+
+    bottomSeparator.image = UIImage.as_resizableRoundedImage(withCornerRadius: 1.0, cornerColor: .black, fill: .black)
+  }
+
+  override class func title() -> String {
+    return "Top and bottom cell separator lines"
+  }
+
+  override class func descriptionTitle() -> String? {
+    return "try rotating me!"
+  }
+}