Simple class for capturing signatures.

The code is compatible with Swift 4 as distributed with Xcode 9 Beta 2 without any modifications. The sample app needs to update the project settings, since that is an easy operation without touching code, its left up to the users of the sample app to update the settings for themselves.

The class supports Swift 3. This branch is not backwards compatible, please download the previous release if you can not support Swift 3. Legacy versions will not be updated anymore.

• Swift 3.0 will be supported
• Swift 2.3 will not be supported

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.

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

• 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

• 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

• didStart()

Notifies the delegate when someone starts a stroke in the view

• didFinish()

Notifies the delegate when someone finishes a stroke in the view

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() 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() {
        print("Started Drawing")
    }
    
    // didFinish() 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() {
        print("Finished Drawing")
    }
}

Check out the example project for more information on how to save signatures and how to clear the signature view.

Add YPDrawSignature.swift to your project

GitHub Issues are for filing bug reports and feature requests only. Use StackOverflow for support related questions and help.

Geert-Jan Nilsen Yuppielabel

• TyrantFox.
• gingofthesouth.
• AndreasLey.
• Andrew Carvajal.

YPDrawSignatureView is available under the MIT license. See the LICENSE file for more info. Feel free to fork and modify.

• Minor bugfix.

• Bugfix

• Added PDF support for exporting signature as high resolution vector graphics
• Deprecated methods and properties are properly marked
• Cleaning up method naming
• Delegate methods are now optional
• Sample project updated to latest settings

• Minor bugfix

• More Swifty API
• Supports Swift 3