Last active
July 29, 2018 14:23
-
-
Save hahnah/2b3f0f373562e1cdc80740b7e0ff5d47 to your computer and use it in GitHub Desktop.
Sample code showing checkmark on UICollectionViewCell
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import UIKit | |
class CollectionViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource { | |
var collectionView : UICollectionView! | |
var toolbar: UIToolbar? | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
let viewWidth = self.view.frame.width | |
let viewHeight = self.view.frame.height | |
let collectionFrame = CGRect(x: 0, y: 0, width: viewWidth, height: viewHeight) | |
// CollectionViewのレイアウトを生成. | |
let layout = UICollectionViewFlowLayout() | |
// Cell間の最小サイズ | |
layout.minimumInteritemSpacing = 4 | |
// 行間の最小サイズ | |
layout.minimumLineSpacing = 4 | |
// Cellのマージン. | |
layout.sectionInset = UIEdgeInsets.zero | |
//layout.sectionInset = UIEdgeInsetsMake(16, 16, 16, 16) | |
// セクションのヘッダーサイズ | |
layout.headerReferenceSize = CGSize(width:0,height:0) | |
// Cellサイズを適当に決める | |
layout.itemSize = CGSize(width: (viewWidth - layout.minimumInteritemSpacing - 8) / 3, height: (viewWidth - layout.minimumLineSpacing - 8) / 3) | |
// CollectionViewを生成. | |
collectionView = UICollectionView(frame: collectionFrame, collectionViewLayout: layout) | |
// Cell に使われるクラスとして CustomCell を登録 | |
collectionView.register(CustomCell.self, forCellWithReuseIdentifier: "MyCell") | |
collectionView.delegate = self | |
collectionView.dataSource = self | |
self.view.addSubview(collectionView) | |
// 複数選択を許可 | |
self.collectionView.allowsMultipleSelection = true | |
} | |
// Cell の総数 | |
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { | |
return 18 | |
} | |
// Cell に値を設定する | |
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { | |
let cell : CustomCell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as! CustomCell | |
cell.contentView.backgroundColor = UIColor.yellow | |
return cell | |
} | |
// Cell がタップで選択されたときに呼ばれる | |
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { | |
guard let cell: CustomCell = collectionView.cellForItem(at: indexPath) as? CustomCell else { return } | |
if self.collectionView.allowsMultipleSelection { | |
cell.isMarked = true | |
} | |
} | |
// Cell がタップで選択解除されたときに呼ばれる | |
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) { | |
guard let cell: CustomCell = collectionView.cellForItem(at: indexPath) as? CustomCell else { return } | |
if self.collectionView.allowsMultipleSelection { | |
cell.isMarked = false | |
} | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import UIKit | |
class CustomCell: UICollectionViewCell { | |
// チェックマーク画像の Asset を用意すること | |
let checkmarkImage: UIImage = UIImage(named: "checkmark")! | |
var checkmarkView: UIImageView! | |
var isMarked: Bool = false { | |
didSet { | |
if isMarked { | |
self.contentView.addSubview(self.checkmarkView!) | |
} else { | |
self.checkmarkView?.removeFromSuperview() | |
} | |
} | |
} | |
func clearCheckmark() -> Void { | |
self.isMarked = false | |
} | |
override init(frame: CGRect) { | |
super.init(frame: frame) | |
self.checkmarkView = UIImageView(image: self.checkmarkImage) | |
} | |
required init?(coder aDecoder: NSCoder) { | |
fatalError("init(coder:) has not been implemented") | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import UIKit | |
class ExtendedCollectionViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource { | |
var collectionView : UICollectionView! | |
var toolbar: UIToolbar? | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
let viewWidth = self.view.frame.width | |
let viewHeight = self.view.frame.height | |
let collectionFrame = CGRect(x: 0, y: 0, width: viewWidth, height: viewHeight) | |
// CollectionViewのレイアウトを生成. | |
let layout = UICollectionViewFlowLayout() | |
// Cell間の最小サイズ | |
layout.minimumInteritemSpacing = 4 | |
// 行間の最小サイズ | |
layout.minimumLineSpacing = 4 | |
// Cellのマージン. | |
layout.sectionInset = UIEdgeInsets.zero | |
//layout.sectionInset = UIEdgeInsetsMake(16, 16, 16, 16) | |
// セクションのヘッダーサイズ | |
layout.headerReferenceSize = CGSize(width:0,height:0) | |
// Cellサイズを適当に決める | |
layout.itemSize = CGSize(width: (viewWidth - layout.minimumInteritemSpacing - 8) / 3, height: (viewWidth - layout.minimumLineSpacing - 8) / 3) | |
// CollectionViewを生成. | |
collectionView = UICollectionView(frame: collectionFrame, collectionViewLayout: layout) | |
// Cell に使われるクラスとして CustomCell を登録 | |
collectionView.register(CustomCell.self, forCellWithReuseIdentifier: "MyCell") | |
collectionView.delegate = self | |
collectionView.dataSource = self | |
self.view.addSubview(collectionView) | |
// Toolbarを生成 | |
let toolbarHeight: CGFloat = 60 | |
let toolbarPaddingBottom: CGFloat = 20 | |
let toolbarRect: CGRect = CGRect(x: 0, y: self.view.bounds.height - toolbarHeight - toolbarPaddingBottom, width: self.view.bounds.width, height: toolbarHeight) | |
toolbar = UIToolbar(frame: toolbarRect) | |
toolbar?.items = self.generateToolbarButtons(isMultipleSelectionMode: self.collectionView.allowsMultipleSelection, isAnyCellselected: false) | |
self.view.addSubview(toolbar!) | |
} | |
// Cell の総数 | |
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { | |
return 18 | |
} | |
// Cell に値を設定する | |
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { | |
let cell : CustomCell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as! CustomCell | |
cell.contentView.backgroundColor = UIColor.yellow | |
return cell | |
} | |
// Cell がタップで選択されたときに呼ばれる | |
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { | |
guard let cell: CustomCell = collectionView.cellForItem(at: indexPath) as? CustomCell else { return } | |
if self.collectionView.allowsMultipleSelection { | |
cell.isMarked = true | |
} | |
let numberOfSelectedItems: Int? = collectionView.indexPathsForSelectedItems?.count | |
if numberOfSelectedItems == 1 { | |
let toolbarButtons: [UIBarButtonItem] = self.generateToolbarButtons(isMultipleSelectionMode: self.collectionView.allowsMultipleSelection, isAnyCellselected: true) | |
self.toolbar?.setItems(toolbarButtons, animated: true) | |
} | |
} | |
// Cell がタップで選択解除されたときに呼ばれる | |
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) { | |
guard let cell: CustomCell = collectionView.cellForItem(at: indexPath) as? CustomCell else { return } | |
if self.collectionView.allowsMultipleSelection { | |
cell.isMarked = false | |
} | |
let numberOfSelectedItems: Int? = collectionView.indexPathsForSelectedItems?.count | |
if numberOfSelectedItems == 0 { | |
let toolbarButtons: [UIBarButtonItem] = self.generateToolbarButtons(isMultipleSelectionMode: self.collectionView.allowsMultipleSelection, isAnyCellselected: false) | |
self.toolbar?.setItems(toolbarButtons, animated: true) | |
} | |
} | |
// Select ボタンが押されたときに呼び出される | |
@objc func enableSelect(_ sender: UIBarButtonItem) -> Void { | |
self.collectionView.allowsSelection = false | |
self.collectionView.allowsMultipleSelection = true | |
self.toolbar?.setItems(self.generateToolbarButtons(isMultipleSelectionMode: self.collectionView.allowsMultipleSelection, isAnyCellselected: false), animated: true) | |
} | |
// Cancel ボタンが押されたときに呼び出される | |
@objc func disableSelect(_ sender: UIBarButtonItem) -> Void { | |
let indexPaths = self.collectionView.indexPathsForSelectedItems! | |
indexPaths.forEach { indexPath in | |
let cell: CustomCell? = self.collectionView.cellForItem(at: indexPath) as? CustomCell | |
cell?.clearCheckmark() | |
self.collectionView.deselectItem(at: indexPath, animated: false) | |
} | |
self.collectionView.allowsSelection = true | |
self.collectionView.allowsMultipleSelection = false | |
self.toolbar?.setItems(self.generateToolbarButtons(isMultipleSelectionMode: self.collectionView.allowsMultipleSelection, isAnyCellselected: false), animated: true) | |
} | |
// Toolbar のボタンを生成 | |
func generateToolbarButtons(isMultipleSelectionMode: Bool, isAnyCellselected: Bool) -> [UIBarButtonItem] { | |
var buttons: [UIBarButtonItem] = [] | |
let addButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: nil) | |
let cameraButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .camera, target: self, action: nil) | |
let sendButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: nil) | |
let trashButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: .trash, target: self, action: nil) | |
let selectButton: UIBarButtonItem = UIBarButtonItem(title: "Select", style: .plain, target: self, action: #selector(self.enableSelect(_:))) | |
let cancelButton: UIBarButtonItem = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(self.disableSelect(_:))) | |
let buttonGap: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil) | |
let selectOrCancelButton: UIBarButtonItem | |
if isMultipleSelectionMode { | |
addButton.isEnabled = false | |
cameraButton.isEnabled = false | |
sendButton.isEnabled = false | |
trashButton.isEnabled = isAnyCellselected ? true : false | |
cancelButton.isEnabled = true | |
selectOrCancelButton = cancelButton | |
} else { | |
trashButton.isEnabled = false | |
selectOrCancelButton = selectButton | |
} | |
buttons = [addButton, buttonGap, cameraButton, buttonGap, sendButton, buttonGap, trashButton, buttonGap, selectOrCancelButton] | |
return buttons | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment