1, directly read the two-dimensional code in the picture
Using Cidetector, you can easily detect and read two-dimensional code. Here's a sample of two-dimensional code from the UIImage, and we're going to print all the two-dimensional code information on the picture.
| The code is as follows |
Copy Code |
Import Uikit
Class Viewcontroller:uiviewcontroller {
Override Func Viewdidload () {
Super.viewdidload ()
Let qrcodeimg = UIImage (named: "Codebg.png")
Let Ciimage:ciimage=ciimage (image:qrcodeimg!)!
Let context = Cicontext (Options:nil)
Let Detector:cidetector=cidetector (Oftype:cidetectortypeqrcode,
Context:context, Options: [Cidetectoraccuracy:cidetectoraccuracyhigh])
Let Features=detector.featuresinimage (Ciimage)
Print ("Scan to two-dimensional code number: \ (features.count)")
Traverse all the two-dimensional yards, and box out
For feature in features as! [Ciqrcodefeature] {
Print (feature.messagestring)
}
}
Override Func didreceivememorywarning () {
Super.didreceivememorywarning ()
}
} |
The console output is as follows:
Scan to two-dimensional code number: 2
Http://www.111cn.net
Http://www.111cn.net
You can see that two two-dimensional codes have been successfully read.
(Note: This I used to use the simulator has not detected a two-dimensional code, the use of real machine debugging is no problem.) Thanks to the netizen "leaves" Reminder, the simulator selected iphone5s and the above equipment can also be detected. ）
2, choose the picture from the album to read the two-dimensional code
| The code is as follows |
Copy Code |
| Import Uikit
Class Viewcontroller:uiviewcontroller, Uiimagepickercontrollerdelegate,
uinavigationcontrollerdelegate {
Override Func Viewdidload () {
Super.viewdidload ()
}
Select album
@IBAction func fromalbum (sender:anyobject) {
Determine if the settings support picture libraries
If Uiimagepickercontroller.issourcetypeavailable (. Photolibrary) {
Initializing the picture controller
Let picker = Uiimagepickercontroller ()
Set up agents
Picker.delegate = Self
Specify picture Controller type
Picker.sourcetype = Uiimagepickercontrollersourcetype.photolibrary
Eject controller, display interface
Self.presentviewcontroller (picker, animated:true, completion: {
()-> Void in
})
}else{
Print ("read album error")
}
}
Select picture after successful agent
Func Imagepickercontroller (Picker:uiimagepickercontroller,
Didfinishpickingmediawithinfo info: [String:anyobject]) {
Get the selected artwork
Let image = Info[uiimagepickercontrolleroriginalimage] as! UIImage
Two-dimensional code reading
Let Ciimage:ciimage=ciimage (image:image)!
Let context = Cicontext (Options:nil)
Let Detector:cidetector=cidetector (Oftype:cidetectortypeqrcode,
Context:context, Options: [Cidetectoraccuracy:cidetectoraccuracyhigh])
Let Features=detector.featuresinimage (Ciimage)
Print ("Scan to two-dimensional code number: \ (features.count)")
Traverse all the two-dimensional yards, and box out
For feature in features as! [Ciqrcodefeature] {
Print (feature.messagestring)
}
Picture Controller exit
Picker.dismissviewcontrolleranimated (True, completion: {
()-> Void in
})
}
Override Func didreceivememorywarning () {
Super.didreceivememorywarning ()
}
} |
3, using the camera scan to read two-dimensional code
(1) The main use of scanning is avfoundation, easy to use
(2) The probe detection area can be set up through the Avcapturemetadataoutput Rectofinterest property. Add a box to the probe area and only the two-dimensional code in the box is scanned.
The effect chart is as follows:
| The code is as follows |
Copy Code |
| Import Uikit
Import Avfoundation
Class Viewcontroller:uiviewcontroller, Avcapturemetadataoutputobjectsdelegate,
uialertviewdelegate{
var scanrectview:uiview!
var device:avcapturedevice!
var input:avcapturedeviceinput!
var output:avcapturemetadataoutput!
var session:avcapturesession!
var preview:avcapturevideopreviewlayer!
Override Func Viewdidload () {
Super.viewdidload ()
}
Scanning through the camera
@IBAction func Fromcamera (sender:anyobject) {
do{
Self.device = Avcapturedevice.defaultdevicewithmediatype (Avmediatypevideo)
Self.input = Try Avcapturedeviceinput (device:device)
Self.output = Avcapturemetadataoutput ()
Output.setmetadataobjectsdelegate (self, queue:dispatch_get_main_queue ())
Self.session = Avcapturesession ()
If Uiscreen.mainscreen (). bounds.size.height<500 {
Self.session.sessionPreset = avcapturesessionpreset640x480
}else{
Self.session.sessionPreset = Avcapturesessionpresethigh
}
Self.session.addInput (Self.input)
Self.session.addOutput (Self.output)
Self.output.metadataObjectTypes = [Avmetadataobjecttypeqrcode]
To compute the intermediate detectable region
Let windowsize:cgsize = Uiscreen.mainscreen (). bounds.size;
Let scansize:cgsize = Cgsizemake (WINDOWSIZE.WIDTH*3/4,
WINDOWSIZE.WIDTH*3/4);
var scanrect:cgrect = CGRectMake (windowsize.width-scansize.width)/2,
(windowsize.height-scansize.height)/2, scansize.width, scansize.height);
Compute rectofinterest Note x,y swap position
Scanrect = CGRectMake (Scanrect.origin.y/windowsize.height,
Scanrect.origin.x/windowsize.width,
Scanrect.size.height/windowsize.height,
Scanrect.size.width/windowsize.width);
To set up a detectable area
Self.output.rectOfInterest = Scanrect
Self.preview = Avcapturevideopreviewlayer (session:self.session)
Self.preview.videoGravity = Avlayervideogravityresizeaspectfill
Self.preview.frame = Uiscreen.mainscreen (). Bounds
Self.view.layer.insertSublayer (Self.preview, atindex:0)
Add the middle Probe area Green box
Self.scanrectview = UIView ();
Self.view.addSubview (Self.scanrectview)
Self.scanRectView.frame = CGRectMake (0, 0, scansize.width, scansize.height);
Self.scanRectView.center = Cgpointmake (
Cgrectgetmidx (Uiscreen.mainscreen (). Bounds),
Cgrectgetmidy (Uiscreen.mainscreen (). bounds));
Self.scanRectView.layer.borderColor = Uicolor.greencolor (). Cgcolor
Self.scanRectView.layer.borderWidth = 1;
Start capturing
Self.session.startRunning ()
}catch _ as Nserror{
Print error messages
Let Erroralert = Uialertview (title: "Reminder",
Message: "Please allow this program to access your camera on the iphone's settings-privacy-camera \" option,
Delegate:self,
Cancelbuttontitle: "OK")
Erroralert.show ()
}
}
Camera capture
Func Captureoutput (captureoutput:avcaptureoutput!,
Didoutputmetadataobjects metadataobjects: [anyobject]!,
Fromconnection connection:avcaptureconnection!) {
var stringvalue:string?
If Metadataobjects.count > 0 {
Let MetadataObject = Metadataobjects[0] as! Avmetadatamachinereadablecodeobject
StringValue = Metadataobject.stringvalue
If StringValue!= nil{
Self.session.stopRunning ()
}
}
Self.session.stopRunning ()
Output results
Let Alertview = Uialertview (title: "Two-dimensional Code", Message:stringvalue,
Delegate:self, Cancelbuttontitle: "OK")
Alertview.show ()
}
message box disappears after confirmation
Func Alertview (Alertview:uialertview, Willdismisswithbuttonindex buttonindex:int) {
Continue scanning
Self.session.startRunning ()
}
Override Func didreceivememorywarning () {
Super.didreceivememorywarning ()
}
} |
