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import UIKit | |
import PencilKit | |
class ViewController: UIViewController { | |
let canvasView = PKCanvasView(frame: .zero) | |
@IBOutlet weak var navigationBar: UINavigationBar! | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
setNavigationBar() | |
canvasView.translatesAutoresizingMaskIntoConstraints = false | |
view.addSubview(canvasView) | |
NSLayoutConstraint.activate([ | |
canvasView.topAnchor.constraint(equalTo: navigationBar.bottomAnchor), | |
canvasView.bottomAnchor.constraint(equalTo: view.bottomAnchor), | |
canvasView.leadingAnchor.constraint(equalTo: view.leadingAnchor), | |
canvasView.trailingAnchor.constraint(equalTo: view.trailingAnchor), | |
]) | |
} | |
func setNavigationBar() { | |
if let navItem = navigationBar.topItem{ | |
let saveItem = UIBarButtonItem(title: "Save", style: .done, target: self, action: #selector(saveImage)) | |
let clearItem = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clear)) | |
let toggleItem = UIBarButtonItem(title: "Toggle Picker", style: .plain, target: self, action: #selector(togglePicker)) | |
navItem.rightBarButtonItems?.append(clearItem) | |
navItem.rightBarButtonItems?.append(toggleItem) | |
navItem.rightBarButtonItems?.append(saveItem) | |
} | |
} | |
@objc func saveImage() { | |
let image = canvasView.drawing.image(from: canvasView.drawing.bounds, scale: 1.0) | |
UIImageWriteToSavedPhotosAlbum(image, self, nil, nil) | |
} | |
@objc func clear() { | |
canvasView.drawing = PKDrawing() | |
} | |
@objc func togglePicker() { | |
if canvasView.isFirstResponder{ | |
canvasView.resignFirstResponder() | |
}else{ | |
canvasView.becomeFirstResponder() | |
} | |
} | |
override func viewDidAppear(_ animated: Bool) { | |
super.viewDidAppear(animated) | |
guard | |
let window = view.window, | |
let toolPicker = PKToolPicker.shared(for: window) else { return } | |
toolPicker.setVisible(true, forFirstResponder: canvasView) | |
toolPicker.addObserver(canvasView) | |
canvasView.becomeFirstResponder() | |
} | |
} |
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