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[Examples] CustomCollectionView in Swift3 (#2591)

Browse Source 
* new Swift example

* removed asyncDataSource and asyncDelegate. Also using collectionNode methods instead of collectionView

* Fixing the folder structure

* Updated with @george-gw feedback. Thanks George.
This commit is contained in:
Rajeev Gupta 2016-11-27 13:01:35 -08:00 committed by Hannah Troisi
parent 8d89f7074f
commit 91734ea979
40 changed files with 1312 additions and 0 deletions
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10
examples/CustomCollectionView-Swift/Podfile Normal file
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# Uncomment this line to define a global platform for your project
# platform :ios, '9.0'
target 'Sample' do
# Comment this line if you're not using Swift and don't want to use dynamic frameworks
use_frameworks!
# Pods for CustomCollectionView
pod 'AsyncDisplayKit', :git => 'https://github.com/facebook/AsyncDisplayKit.git', :tag => '2.0-beta.1'
end

395
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57
examples/CustomCollectionView-Swift/Sample/AppDelegate.swift Normal file
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//
// AppDelegate.swift
// Sample
//
// Created by Rajeev Gupta on 11/9/16.
//
// 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 UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}

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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_10.jpg",
"scale" : "1x"
},
{
"idiom" : "universal",
"scale" : "2x"
},
{
"idiom" : "universal",
"scale" : "3x"
}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
}

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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_11.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_11.jpg",
"scale" : "1x"
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{
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{
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"info" : {
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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_12.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_12.jpg",
"scale" : "1x"
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"scale" : "2x"
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{
"idiom" : "universal",
"scale" : "3x"
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"info" : {
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"author" : "xcode"
}
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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_13.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_13.jpg",
"scale" : "1x"
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{
"idiom" : "universal",
"scale" : "2x"
},
{
"idiom" : "universal",
"scale" : "3x"
}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
}

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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_2.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_2.jpg",
"scale" : "1x"
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{
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"scale" : "2x"
},
{
"idiom" : "universal",
"scale" : "3x"
}
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"info" : {
"version" : 1,
"author" : "xcode"
}
}

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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_3.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_3.jpg",
"scale" : "1x"
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"scale" : "2x"
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{
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}
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"info" : {
"version" : 1,
"author" : "xcode"
}
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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_4.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_4.jpg",
"scale" : "1x"
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"info" : {
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"author" : "xcode"
}
}

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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_5.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_5.jpg",
"scale" : "1x"
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{
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"scale" : "2x"
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{
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}
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"info" : {
"version" : 1,
"author" : "xcode"
}
}

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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_6.jpg",
"scale" : "1x"
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{
"idiom" : "universal",
"scale" : "2x"
},
{
"idiom" : "universal",
"scale" : "3x"
}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_7.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_7.jpg",
"scale" : "1x"
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{
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"scale" : "2x"
},
{
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}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
}

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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_8.jpg",
"scale" : "1x"
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{
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"scale" : "2x"
},
{
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}
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"info" : {
"version" : 1,
"author" : "xcode"
}
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examples/CustomCollectionView-Swift/Sample/Assets.xcassets/image_9.imageset/Contents.json vendored Normal file
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{
"images" : [
{
"idiom" : "universal",
"filename" : "image_9.jpg",
"scale" : "1x"
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{
"idiom" : "universal",
"scale" : "2x"
},
{
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}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
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examples/CustomCollectionView-Swift/Sample/Base.lproj/LaunchScreen.storyboard Normal file
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="EHf-IW-A2E">
<objects>
<viewController id="01J-lp-oVM" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
<viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="53" y="375"/>
</scene>
</scenes>
</document>

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
<viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
</scene>
</scenes>
</document>

51
examples/CustomCollectionView-Swift/Sample/ImageCellNode.swift Normal file
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//
// ImageCellNode.swift
// Sample
//
// Created by Rajeev Gupta on 11/9/16.
//
// 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 UIKit
import AsyncDisplayKit
class ImageCellNode: ASCellNode {
let imageNode = ASImageNode()
required init(with image : UIImage) {
super.init()
imageNode.image = image
self.addSubnode(self.imageNode)
}
override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
let imageSize = imageNode.image?.size
print("imageNode= \(imageNode.bounds), image=\(imageSize)")
var imageRatio: CGFloat = 0.5
if imageNode.image != nil {
imageRatio = (imageNode.image?.size.height)! / (imageNode.image?.size.width)!
}
let imagePlace = ASRatioLayoutSpec(ratio: imageRatio, child: imageNode)
let stackLayout = ASStackLayoutSpec.horizontal()
stackLayout.justifyContent = .start
stackLayout.alignItems = .start
stackLayout.style.flexShrink = 1.0
stackLayout.children = [imagePlace]
return ASInsetLayoutSpec(insets: UIEdgeInsets.zero, child: stackLayout)
}
}

38
examples/CustomCollectionView-Swift/Sample/Info.plist Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>en</string>
<key>CFBundleExecutable</key>
<string>$(EXECUTABLE_NAME)</string>
<key>CFBundleIdentifier</key>
<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>$(PRODUCT_NAME)</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleVersion</key>
<string>1</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIMainStoryboardFile</key>
<string>Main</string>
<key>UIRequiredDeviceCapabilities</key>
<array>
<string>armv7</string>
</array>
<key>UISupportedInterfaceOrientations</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
</dict>
</plist>

252
examples/CustomCollectionView-Swift/Sample/MosaicCollectionViewLayout.swift Normal file
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//
// MosaicCollectionViewLayout
// Sample
//
// Created by Rajeev Gupta on 11/9/16.
//
// 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 Foundation
import UIKit
import AsyncDisplayKit
protocol MosaicCollectionViewLayoutDelegate: ASCollectionDelegate {
func collectionView(_ collectionView: UICollectionView, layout: MosaicCollectionViewLayout, originalItemSizeAtIndexPath: IndexPath) -> CGSize
}
class MosaicCollectionViewLayout: UICollectionViewFlowLayout {
var numberOfColumns: Int
var columnSpacing: CGFloat
var _sectionInset: UIEdgeInsets
var interItemSpacing: UIEdgeInsets
var headerHeight: CGFloat
var _columnHeights: [[CGFloat]]?
var _itemAttributes = [[UICollectionViewLayoutAttributes]]()
var _headerAttributes = [UICollectionViewLayoutAttributes]()
var _allAttributes = [UICollectionViewLayoutAttributes]()
required override init() {
self.numberOfColumns = 2
self.columnSpacing = 10.0
self.headerHeight = 44.0 //viewcontroller
self._sectionInset = UIEdgeInsetsMake(10.0, 10.0, 10.0, 10.0)
self.interItemSpacing = UIEdgeInsetsMake(10.0, 0, 10.0, 0)
super.init()
self.scrollDirection = .vertical
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
public var delegate : MosaicCollectionViewLayoutDelegate?
override func prepare() {
super.prepare()
guard let collectionView = self.collectionView else { return }
_itemAttributes = []
_allAttributes = []
_headerAttributes = []
_columnHeights = []
var top: CGFloat = 0
let numberOfSections: NSInteger = collectionView.numberOfSections
for section in 0 ..< numberOfSections {
let numberOfItems = collectionView.numberOfItems(inSection: section)
top += _sectionInset.top
if (headerHeight > 0) {
let headerSize: CGSize = self._headerSizeForSection(section: section)
let attributes = UICollectionViewLayoutAttributes(forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, with: NSIndexPath(row: 0, section: section) as IndexPath)
attributes.frame = CGRect(x: _sectionInset.left, y: top, width: headerSize.width, height: headerSize.height)
_headerAttributes.append(attributes)
_allAttributes.append(attributes)
top = attributes.frame.maxY
}
_columnHeights?.append([]) //Adding new Section
for _ in 0 ..< self.numberOfColumns {
self._columnHeights?[section].append(top)
}
let columnWidth = self._columnWidthForSection(section: section)
_itemAttributes.append([])
for idx in 0 ..< numberOfItems {
let columnIndex: Int = self._shortestColumnIndexInSection(section: section)
let indexPath = IndexPath(item: idx, section: section)
let itemSize = self._itemSizeAtIndexPath(indexPath: indexPath);
let xOffset = _sectionInset.left + (columnWidth + columnSpacing) * CGFloat(columnIndex)
let yOffset = _columnHeights![section][columnIndex]
let attributes = UICollectionViewLayoutAttributes(forCellWith: indexPath)
attributes.frame = CGRect(x: xOffset, y: yOffset, width: itemSize.width, height: itemSize.height)
_columnHeights?[section][columnIndex] = attributes.frame.maxY + interItemSpacing.bottom
_itemAttributes[section].append(attributes)
_allAttributes.append(attributes)
}
let columnIndex: Int = self._tallestColumnIndexInSection(section: section)
top = (_columnHeights?[section][columnIndex])! - interItemSpacing.bottom + _sectionInset.bottom
for idx in 0 ..< _columnHeights![section].count {
_columnHeights![section][idx] = top
}
}
}
override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]?
{
var includedAttributes: [UICollectionViewLayoutAttributes] = []
// Slow search for small batches
for attribute in _allAttributes {
if (attribute.frame.intersects(rect)) {
includedAttributes.append(attribute)
}
}
return includedAttributes
}
override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes?
{
guard indexPath.section < _itemAttributes.count,
indexPath.item < _itemAttributes[indexPath.section].count
else {
return nil
}
return _itemAttributes[indexPath.section][indexPath.item]
}
override func layoutAttributesForSupplementaryView(ofKind elementKind: String, at indexPath: IndexPath) -> UICollectionViewLayoutAttributes?
{
if (elementKind == UICollectionElementKindSectionHeader) {
return _headerAttributes[indexPath.section]
}
return nil
}
override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
if (!(self.collectionView?.bounds.size.equalTo(newBounds.size))!) {
return true;
}
return false;
}
func _widthForSection (section: Int) -> CGFloat
{
return self.collectionView!.bounds.size.width - _sectionInset.left - _sectionInset.right;
}
func _columnWidthForSection(section: Int) -> CGFloat
{
return (self._widthForSection(section: section) - ((CGFloat(numberOfColumns - 1)) * columnSpacing)) / CGFloat(numberOfColumns)
}
func _itemSizeAtIndexPath(indexPath: IndexPath) -> CGSize
{
var size = CGSize(width: self._columnWidthForSection(section: indexPath.section), height: 0)
let originalSize = self.delegate!.collectionView(self.collectionView!, layout:self, originalItemSizeAtIndexPath:indexPath)
if (originalSize.height > 0 && originalSize.width > 0) {
size.height = originalSize.height / originalSize.width * size.width
}
return size
}
func _headerSizeForSection(section: Int) -> CGSize
{
return CGSize(width: self._widthForSection(section: section), height: headerHeight)
}
override var collectionViewContentSize: CGSize
{
var height: CGFloat = 0
if ((_columnHeights?.count)! > 0) {
if (_columnHeights?[(_columnHeights?.count)!-1].count)! > 0 {
height = (_columnHeights?[(_columnHeights?.count)!-1][0])!
}
}
return CGSize(width: self.collectionView!.bounds.size.width, height: height)
}
func _tallestColumnIndexInSection(section: Int) -> Int
{
var index: Int = 0;
var tallestHeight: CGFloat = 0;
_ = _columnHeights?[section].enumerated().map { (idx,height) in
if (height > tallestHeight) {
index = idx;
tallestHeight = height
}
}
return index
}
func _shortestColumnIndexInSection(section: Int) -> Int
{
var index: Int = 0;
var shortestHeight: CGFloat = CGFloat.greatestFiniteMagnitude
_ = _columnHeights?[section].enumerated().map { (idx,height) in
if (height < shortestHeight) {
index = idx;
shortestHeight = height
}
}
return index
}
}
class MosaicCollectionViewLayoutInspector: NSObject, ASCollectionViewLayoutInspecting
{
func collectionView(_ collectionView: ASCollectionView, constrainedSizeForNodeAt indexPath: IndexPath) -> ASSizeRange {
let layout = collectionView.collectionViewLayout as! MosaicCollectionViewLayout
return ASSizeRangeMake(CGSize.zero, layout._itemSizeAtIndexPath(indexPath: indexPath))
}
func collectionView(_ collectionView: ASCollectionView, constrainedSizeForSupplementaryNodeOfKind: String, at atIndexPath: IndexPath) -> ASSizeRange
{
let layout = collectionView.collectionViewLayout as! MosaicCollectionViewLayout
return ASSizeRange.init(min: CGSize.zero, max: layout._headerSizeForSection(section: atIndexPath.section))
}
/**
* Asks the inspector for the number of supplementary sections in the collection view for the given kind.
*/
func collectionView(_ collectionView: ASCollectionView, numberOfSectionsForSupplementaryNodeOfKind kind: String) -> UInt {
if (kind == UICollectionElementKindSectionHeader) {
return UInt((collectionView.dataSource?.numberOfSections!(in: collectionView))!)
} else {
return 0
}
}
/**
* Asks the inspector for the number of supplementary views for the given kind in the specified section.
*/
func collectionView(_ collectionView: ASCollectionView, supplementaryNodesOfKind kind: String, inSection section: UInt) -> UInt {
if (kind == UICollectionElementKindSectionHeader) {
return 1
} else {
return 0
}
}
}

101
examples/CustomCollectionView-Swift/Sample/ViewController.swift Normal file
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//
// ViewController.swift
// Sample
//
// Created by Rajeev Gupta on 11/9/16.
//
// 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 UIKit
import AsyncDisplayKit
class ViewController: UIViewController, MosaicCollectionViewLayoutDelegate, ASCollectionDataSource, ASCollectionDelegate {
var _sections = [[UIImage]]()
let _collectionNode: ASCollectionNode!
let _layoutInspector = MosaicCollectionViewLayoutInspector()
let kNumberOfImages: UInt = 14
required init?(coder aDecoder: NSCoder) {
let layout = MosaicCollectionViewLayout()
layout.numberOfColumns = 3;
layout.headerHeight = 44;
_collectionNode = ASCollectionNode(frame: CGRect.zero, collectionViewLayout: layout)
super.init(coder: aDecoder)
layout.delegate = self
_sections.append([]);
var section = 0
for idx in 0 ..< kNumberOfImages {
let name = String(format: "image_%d.jpg", idx)
_sections[section].append(UIImage(named: name)!)
if ((idx + 1) % 5 == 0 && idx < kNumberOfImages - 1) {
section += 1
_sections.append([])
}
}
_collectionNode.dataSource = self;
_collectionNode.delegate = self;
_collectionNode.view.layoutInspector = _layoutInspector
_collectionNode.backgroundColor = UIColor.white
_collectionNode.view.isScrollEnabled = true
_collectionNode.registerSupplementaryNode(ofKind: UICollectionElementKindSectionHeader)
}
deinit {
_collectionNode.dataSource = nil;
_collectionNode.delegate = nil;
}
override func viewDidLoad() {
super.viewDidLoad()
self.view.addSubnode(_collectionNode!)
}
override func viewWillLayoutSubviews() {
_collectionNode.frame = self.view.bounds;
}
func collectionNode(_ collectionNode: ASCollectionNode, nodeForItemAt indexPath: IndexPath) -> ASCellNode {
let image = _sections[indexPath.section][indexPath.item]
return ImageCellNode(with: image)
}
func collectionNode(_ collectionNode: ASCollectionNode, nodeForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> ASCellNode {
let textAttributes : NSDictionary = [
NSFontAttributeName: UIFont.preferredFont(forTextStyle: UIFontTextStyle.headline),
NSForegroundColorAttributeName: UIColor.gray
]
let textInsets = UIEdgeInsets(top: 11, left: 0, bottom: 11, right: 0)
let textCellNode = ASTextCellNode(attributes: textAttributes as! [AnyHashable : Any], insets: textInsets)
textCellNode.text = String(format: "Section %zd", indexPath.section + 1)
return textCellNode;
}
func numberOfSections(in collectionNode: ASCollectionNode) -> Int {
return _sections.count
}
func collectionNode(_ collectionNode: ASCollectionNode, numberOfItemsInSection section: Int) -> Int {
return _sections[section].count
}
internal func collectionView(_ collectionView: UICollectionView, layout: MosaicCollectionViewLayout, originalItemSizeAtIndexPath: IndexPath) -> CGSize {
return _sections[originalItemSizeAtIndexPath.section][originalItemSizeAtIndexPath.item].size
}
}