Swift opens a woman's signature (handwriting is signed by the user on the screen and a picture is generated)

This article describes how to use the Swift language to capture a user's signature on an iOS device (in fact, this is a simple drawing board program).

Implementation features are as follows:

1, the top of the page provides a signature area (UIView) that the user can sign in this area.

2, click "Preview Signature", will obtain the user signature generation UIImage, displays in the ImageView below.

3, click "Save Signature" to save the user's signature to the device album.

The effect chart is as follows:

The code is as follows:

---drawsignatureview.swift (signed view component)---

The code is as follows

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Import Uikit public class Drawsignatureview:uiview { Public properties public var linewidth:cgfloat = 2.0 { Didset { Self.path.lineWidth = LineWidth } } public var strokecolor:uicolor = Uicolor.blackcolor () public var signaturebackgroundcolor:uicolor = Uicolor.whitecolor () Private property private var path = Uibezierpath () private var pts = [Cgpoint] (Count:5, Repeatedvalue:cgpoint ()) private var ctr = 0 Init Override Init (Frame:cgrect) { Super.init (Frame:frame) Self.backgroundcolor = Self.signaturebackgroundcolor Self.path.lineWidth = Self.linewidth } Init Required public init? (Coder Adecoder:nscoder) { Super.init (Coder:adecoder) Self.backgroundcolor = Self.signaturebackgroundcolor Self.path.lineWidth = Self.linewidth } Draw Override public func DrawRect (rect:cgrect) { Self.strokeColor.setStroke () Self.path.stroke () } Touch Signature Related methods Override public func Touchesbegan (touches:set<uitouch>, withevent event:uievent?) { If let Firsttouch = touches.first{ Let touchpoint = Firsttouch.locationinview (self) self.ctr = 0 Self.pts[0] = touchpoint } } Override public func touchesmoved (touches:set<uitouch>, withevent event:uievent?) { If let Firsttouch = touches.first{ Let touchpoint = Firsttouch.locationinview (self) self.ctr++ SELF.PTS[SELF.CTR] = touchpoint if (self.ctr = = 4) { SELF.PTS[3] = Cgpointmake (self.pts[2].x + self.pts[4].x)/2.0, (Self.pts[2].y + self.pts[4].y)/2.0) Self.path.moveToPoint (Self.pts[0]) Self.path.addCurveToPoint (Self.pts[3], controlpoint1:self.pts[1], CONTROLPOINT2:SELF.PTS[2]) Self.setneedsdisplay () Self.pts[0] = self.pts[3] SELF.PTS[1] = self.pts[4] SELF.CTR = 1 } Self.setneedsdisplay () } } Override public func touchesended (touches:set<uitouch>, withevent event:uievent?) { if self.ctr = = 0{ Let touchpoint = Self.pts[0] Self.path.moveToPoint (Cgpointmake (TOUCHPOINT.X-1.0,TOUCHPOINT.Y)) Self.path.addLineToPoint (Cgpointmake (TOUCHPOINT.X+1.0,TOUCHPOINT.Y)) Self.setneedsdisplay () } else { self.ctr = 0 } } Signature View Empty public func clearsignature () { Self.path.removeAllPoints () Self.setneedsdisplay () } Save Signature as UIImage public func getsignature ()->uiimage { Uigraphicsbeginimagecontext (Cgsizemake (Self.bounds.size.width, Self.bounds.size.height)) Self.layer.renderInContext (Uigraphicsgetcurrentcontext ()!) Let Signature:uiimage = Uigraphicsgetimagefromcurrentimagecontext () Uigraphicsendimagecontext () return signature } }

---viewcontroller.swift (using sample)---

The code is as follows

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Import Uikit Class Viewcontroller:uiviewcontroller { Signature Preview @IBOutlet weak var imageview:uiimageview! Signature Area View var drawview:drawsignatureview! Override Func Viewdidload () { Super.viewdidload () Signature area location Size var drawviewframe = Self.view.bounds DrawViewFrame.size.height = 200 Add a signature area Drawview = Drawsignatureview (frame:drawviewframe) Self.view.addSubview (Drawview) } Preview signature @IBAction func previewsignature (sender:anyobject) { Let Signatureimage = Self.drawView.getSignature () Imageview.image = Signatureimage } Save Signature @IBAction func savasignature (sender:anyobject) { Let Signatureimage = Self.drawView.getSignature () Uiimagewritetosavedphotosalbum (signatureimage, nil, nil, nil) Self.drawView.clearSignature () } Clear Signature @IBAction func clearsignature (sender:anyobject) { Self.drawView.clearSignature () Self.imageView.image = Nil } Override Func didreceivememorywarning () { Super.didreceivememorywarning () } }