YPDrawSignatureView

Simple class for capturing signatures.

Legacy Support

The class is not backwards compatible. Please download previous releases if you need support for earlier versions of Swift. Legacy versions will not be updated.

Add a new UIView where you want the signature capture field. Set its class to YPDrawSignatureView, and connect it to an @IBOutlet property in your UIViewController. For saving and clearing the signature, add two buttons to your view controller. Hook each button up to an @IBAction function.

With the view selected, choose the IB Attributes Inspector panel to set custom values, or set them in code where you initialise the signature view.

New Feature

On ground of popular demand, added signature export as Vector Path in PDF Data Format.

Methods

clear()

Clears signature

getSignature()

Returns signature with bounds of YPDrawSignatureView instance

getCroppedSignature()

Returns signature with bounds of signature

getPDFSignature() Returns signature as Vector Path PDF Data Format

Properties

doesContainSignature: Bool

This is a computed read-only property returning true if the view actually contains a signature

strokeWidth: CGFloat

Sets the width of the signature stroke

strokeColor: UIColor

Sets the UIColor of the signature stroke

Optional Protocol Methods

didStart(_ view: YPDrawSignatureView)

Notifies the delegate when someone starts a stroke in the view.

didFinish(_ view: YPDrawSignatureView)

Notifies the delegate when someone finishes a stroke in the view

Example Code

The following sample code checks if there is a signature in the view before getting it.

class ViewController: UIViewController, YPSignatureDelegate {
    
    // Connect this Outlet to the Signature View
    @IBOutlet weak var signatureView: YPDrawSignatureView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // Setting this view controller as the signature view delegate, so the didStart() and
        // didFinish() methods below in the delegate section are called.
        signatureView.delegate = self
    }
    
    // Function for clearing the content of signature view
    @IBAction func clearSignature(_ sender: UIButton) {
        // This is how the signature gets cleared
        self.signatureView.clear()
    }
    
    // Function for saving signature
    @IBAction func saveSignature(_ sender: UIButton) {
        // Getting the Signature Image from self.drawSignatureView using the method getSignature().
        if let signatureImage = self.signatureView.getSignature(scale: 10) {
            
            // Saving signatureImage from the line above to the Photo Roll.
            // The first time you do this, the app asks for access to your pictures.
            UIImageWriteToSavedPhotosAlbum(signatureImage, nil, nil, nil)
            
            // Since the Signature is now saved to the Photo Roll, the View can be cleared anyway.
            self.signatureView.clear()
        }
    }
    
    // MARK: - Delegate Methods
    
    // The delegate functions gives feedback to the instanciating class. All functions are optional,
    // meaning you just implement the one you need.
    
    // didStart(_ view: YPDrawSignatureView) is called right after the first touch is registered in the view.
    // For example, this can be used if the view is embedded in a scroll view, temporary
    // stopping it from scrolling while signing.
    func didStart(_ view: YPDrawSignatureView) {
        print("Started Drawing")
    }
    
    // didFinish(_ view: YPDrawSignatureView) is called rigth after the last touch of a gesture is registered in the view.
    // Can be used to enabe scrolling in a scroll view if it has previous been disabled.
    func didFinish(_ view: YPDrawSignatureView) {
        print("Finished Drawing")
    }
}