Swift: Two-dimensional code scanning and generation using system avfoundation

The system-provided avcapturesession is only suitable for systems above iOS7.0. Please use Zbar to replace the previous

: http://download.csdn.net/detail/huobanbengkui/8881097

To configure project:

Introduced:

Import Foundation
Import Avfoundation

Accept avcapturemetadataoutputobjectsdelegate (such as: Class Qrcodevc:uiviewcontroller, Avcapturemetadataoutputobjectsdelegate, Uialertviewdelegate)

To define a property:

Let device = Avcapturedevice.defaultdevicewithmediatype (Avmediatypevideo)
Let session = Avcapturesession ()
var layer:avcapturevideopreviewlayer?

I. Two-dimensional code scanning

1. Capturing the QR code using the camera

Func Setupcamera () {
Self.session.sessionPreset = Avcapturesessionpresethigh
var error:nserror?
Let input = Avcapturedeviceinput (Device:device, error: &error)
if (Error! = Nil && input = = nil) {
var Erroralert = Uialertview (title: "Reminder", Message: "In the iphone's \" Settings-privacy-camera \ "option, agree to this program to visit your camera", delegate:self, Cancelbuttontitle: "OK")
Erroralert.show ()
Return
}
If Session.canaddinput (input) {
Session.addinput (Input)
}
Layer = Avcapturevideopreviewlayer (session:session)
layer!. Videogravity = Avlayervideogravityresizeaspectfill
Can see the lens area
layer!. frame = CGRectMake (0, 0,320,568)
Self.view.layer.insertSublayer (Self.layer, atindex:0)

Let output = Avcapturemetadataoutput ()
Setting the response area
Output.rectofinterest = CGRectMake (0, 0, 0, 0)
Output.setmetadataobjectsdelegate (self, queue:dispatch_get_main_queue ())
If Session.canaddoutput (output) {
Session.addoutput (Output)
Output.metadataobjecttypes = [Avmetadataobjecttypeqrcode];
}

Session.startrunning ()
}

2. After identifying the QR code, parse the data (implement Avcapturemetadataoutputobjectsdelegate proxy method)

Func captureoutput (captureoutput:avcaptureoutput!, didoutputmetadataobjects metadataobjects: [AnyObject]!, Fromconnection connection:avcaptureconnection!) {

var stringvalue:string?
If Metadataobjects.count > 0 {
var metadataobject = metadataobjects[0] as! Avmetadatamachinereadablecodeobject
StringValue = Metadataobject.stringvalue

If stringvalue! = nil{
Self.session.stopRunning ()


}
}
Self.session.stopRunning ()
var Alertview = Uialertview (title: "QR Code", Message:stringvalue, Delegate:self, cancelbuttontitle: "OK")
Alertview.show ()
}

Finally, when the page disappears:

Override func Viewwilldisappear (Animated:bool) {
Super.viewwilldisappear (animated)

If self.session.running {
Self.session.stopRunning ()
}
}

Two. Two-dimensional code generation

Func createqrforstring (qrstring:string, qrimagename:string?), UIImage? {
If let sureqrstring = qrstring {
Let StringData = sureqrstring.datausingencoding (nsutf8stringencoding, Allowlossyconversion:false)
Create a two-dimensional code filter
Let Qrfilter = Cifilter (name: "Ciqrcodegenerator")
Qrfilter.setvalue (StringData, Forkey: "InputMessage")
Qrfilter.setvalue ("H", Forkey: "Inputcorrectionlevel")
Let Qrciimage = Qrfilter.outputimage
Create a color filter, black and white
Let Colorfilter = Cifilter (name: "Cifalsecolor")
Colorfilter.setdefaults ()
Colorfilter.setvalue (Qrciimage, Forkey: "Inputimage")
Colorfilter.setvalue (Cicolor (red:0, green:0, blue:0), Forkey: "InputColor0")
Colorfilter.setvalue (Cicolor (red:1, Green:1, blue:1), Forkey: "InputColor1")
return QR code image
Let Codeimage = UIImage (CIImage:colorFilter.outputImage.imageByApplyingTransform (Cgaffinetransformmakescale (5, 5)) )
Usually, the QR code is customized, the middle will put the image that wants to express the meaning
If Let Iconimage = UIImage (named:qrimagename!) {
Let rect = CGRectMake (0, 0, codeimage!. Size.width, codeimage!. Size.Height)
Uigraphicsbeginimagecontext (Rect.size)

codeimage!. Drawinrect (Rect)
Let avatarsize = Cgsizemake (Rect.size.width * 0.25, Rect.size.height * 0.25)
Let x = (rect.width-avatarsize.width) * 0.5
Let y = (rect.height-avatarsize.height) * 0.5
Iconimage.drawinrect (CGRectMake (x, Y, Avatarsize.width, avatarsize.height))
Let Resultimage = Uigraphicsgetimagefromcurrentimagecontext ()

Uigraphicsendimagecontext ()
Return Resultimage
}
Return Codeimage
}
return Nil
}

How to use it??

var Imageviewicon = Uiimageview (frame:cgrectmake (100, 100, 150, 150))
Imageviewicon.image = createqrforstring ("Good", Qrimagename: "Ocrback")//"Ocrback" put the name of the middle picture of the QR code
Self.view.addSubview (Imageviewicon)

Last Note:

The Avfoundation framework supports not only QR code scanning. Very many other barcode categories are also supported. Like Code39,code128,aztec, and PDF417. You can try to change it.

Swift: Two-dimensional code scanning and generation using system avfoundation