Two-dimensional code

#import "ViewController.h"
#import <CoreImage/CoreImage.h>
#import <AVFoundation/AVFoundation.h>
#import "CustomView.h"
#define WIDTH Self.view.frame.size.width
#define Height Self.view.frame.size.height
@interface Viewcontroller () <AVCaptureMetadataOutputObjectsDelegate>

{
BOOL Torchison;
}
@property (Weak, nonatomic) Iboutlet Uiimageview *imageview;
@property (Nonatomic,strong) avcapturesession * session;
@property (nonatomic,strong) avcapturevideopreviewlayer * preview;
@end

@implementation Viewcontroller
-(Ibaction) button: (ID) Sender {


[Self Creamt];
}

-(void) Viewdidload {
[Super Viewdidload];

1 instantiation of the QR Code filter
Cifilter * Filter=[cifilter filterwithname:@ "Ciqrcodegenerator"];
2. Restore the default properties of the filter
[Filter SetDefaults];
3 Converting a string to NSDate

NSData * data=[@ "http://www.baidu.com" datausingencoding:nsutf8stringencoding];
4 Pass the KVO settings filter to the data in the future filter will know to notify the passed in to generate two-dimensional code
[Filter Setvalue:data forkey:@ "InputMessage"];

5 generating two-dimensional code
Ciimage * Outputimage=[filter Outputimage];
Self.imageview.image=[uiimage Imagewithciimage:outputimage];
Additional setup after loading the view, typically from a nib.
}

-(void) didreceivememorywarning {
[Super didreceivememorywarning];
Dispose of any resources the can be recreated.
}
-(void) Creamt
{
1. Instance session shooting device
Avcapturedevice * Device=[avcapturedevice Defaultdevicewithmediatype:avmediatypevideo];
2. Setting the input device
Avcapturedeviceinput *input=[avcapturedeviceinput Deviceinputwithdevice:device Error:nil];
3 Setting the number of meta outputs
3.1 Power session shooting meta-data output
avcapturemetadataoutput* Output=[[avcapturemetadataoutput Alloc]init];
Setting the output data agent
[Output Setmetadataobjectsdelegate:self queue:dispatch_get_main_queue ()];
4 adding a shooting session
4.1 Power conversation Shooting session
Avcapturesession * Session=[[avcapturesession Alloc]init];
4.2 Adding session Input
[Session Addinput:input];
4.3 Adding session output
[Session Addoutput:output];
Self.session=session;

4.4 Set the output data type, you need to add the original data output to the session before you can specify the metadata type, or you will get an error
[Output SETMETADATAOBJECTTYPES:@[AVMETADATAOBJECTTYPEQRCODE]];

5
Avcapturevideopreviewlayer * Preview=[[avcapturevideopreviewlayer alloc]initwithsession:_session];
Preview.videogravity =avlayervideogravityresizeaspectfill;
Preview.frame=self.view.bounds;
5.2 Inserting a layer into the current view
[Self.view.layer Insertsublayer:preview atindex:100];
Self.preview=preview;
6. Start the session
[_session startrunning];

UIView * Line =[[uiview alloc]initwithframe:cgrectmake (0, 0, 280, 1)];
Line.backgroundcolor=[uicolor Orangecolor];

CustomView * L=[[customview alloc]initwithframe:cgrectmake (width/2-140, 100, 280, 280)];

[L Addsubview:line];
[Self runloop:line];
L.backgroundcolor=[uicolor Clearcolor];
[Self.view addsubview:l];


}
-(ibaction) Open: (ID) Sender {
if (Torchison) {
[Self turntorchon:no];
}else{
[Self turntorchon:yes];
}

}

-(void) Runloop: (uiview*) line
{
[UIView Animatewithduration:3 animations:^{
Line.frame=cgrectmake (0, 280, 280, 1);
}completion:^ (BOOL finished) {
Line.frame=cgrectmake (0, 0, 280, 1);
[Self runloop:line];
}];


}
-(void) Turntorchon: (bool) on {

Class Capturedeviceclass = nsclassfromstring (@ "Avcapturedevice");
if (capturedeviceclass! = nil) {
Avcapturedevice *device = [Avcapturedevice defaultdevicewithmediatype:avmediatypevideo];
if ([device hastorch] && [device Hasflash]) {

[Device Lockforconfiguration:nil];
if (ON) {
[Device Settorchmode:avcapturetorchmodeon];
[Device Setflashmode:avcaptureflashmodeon];
Torchison = YES;
} else {
[Device Settorchmode:avcapturetorchmodeoff];
[Device Setflashmode:avcaptureflashmodeoff];
Torchison = NO;
}
[Device unlockforconfiguration];
}
}
}
-(void) Captureoutput: (Avcaptureoutput *) captureoutput didoutputmetadataobjects: (Nsarray *) metadataobjects Fromconnection: (avcaptureconnection *) connection
{
Frequent scans, invoking proxy methods
1 if the scan is complete, stop the session
[Self.session stoprunning];
2 Deleting a preview layer
[Self.preview Removefromsuperlayer];
3 Setting interface to display scan results
Avmetadatamachinereadablecodeobject * obj =metadataobjects[0];
NSLog (@ "%@", Obj.stringvalue);

}
@end

#import "CustomView.h"
#define WIDTH Self.frame.size.width
#define Height Self.frame.size.height
@implementation CustomView


Only override Drawrect:if perform custom drawing.
An empty implementation adversely affects performance during animation.
-(void) DrawRect: (cgrect) Rect {


Get context
Cgcontextref context =uigraphicsgetcurrentcontext ();
Set Line Style
Cgcontextsetlinecap (context, kcglinecapround);
Set Line thickness width
Cgcontextsetlinewidth (context, 1.0);


Cgcontextdrawpath (context, kcgpathstroke);
Self.backgroundcolor=[uicolor Clearcolor];
Set color
Cgcontextsetrgbstrokecolor (Context, 1.0, 0.0, 0.0, 1.0);
Set a start path
Cgcontextbeginpath (context);
The starting point is set to (0,0): Note that this is the relative coordinate of the corresponding area in the context
Cgcontextmovetopoint (context, 0, 0);
Set the next coordinate point
Cgcontextaddlinetopoint (context, width, 0);
Set the next coordinate point
Cgcontextaddlinetopoint (context, width, height);
Set the next coordinate point
Cgcontextaddlinetopoint (context, 0, height);
Set the next coordinate point
Cgcontextaddlinetopoint (context, 0, 0);
Connect the coordinate points defined above
Cgcontextstrokepath (context);


Get context
Cgcontextref con =uigraphicsgetcurrentcontext ();
Set Line Style
Cgcontextsetlinecap (Con, kcglinecapround);
Set Line thickness width
Cgcontextsetlinewidth (context, 3.0);
Cgcontextdrawpath (Con, kcgpathstroke);
Set color
Cgcontextsetrgbstrokecolor (Con, 1.0, 1.0, 0.0, 1.0);
Set a start path
Cgcontextbeginpath (con);
The starting point is set to (0,0): Note that this is the relative coordinate of the corresponding area in the context
Cgcontextmovetopoint (Con, 0, 20);
Set the next coordinate point
Cgcontextaddlinetopoint (Con, 0, 0);
Set the next coordinate point
Cgcontextaddlinetopoint (Con, 20, 0);
Cgcontextstrokepath (con);


Get context
Cgcontextref Con2 =uigraphicsgetcurrentcontext ();
Set Line Style
Cgcontextsetlinecap (Con2, Kcglinecapround);
Set Line thickness width
Cgcontextsetlinewidth (context, 3.0);
Cgcontextdrawpath (Con2, Kcgpathstroke);
Set color
Cgcontextsetrgbstrokecolor (Con2, 1.0, 1.0, 0.0, 1.0);
Set a start path
Cgcontextbeginpath (con);
The starting point is set to (0,0): Note that this is the relative coordinate of the corresponding area in the context
Cgcontextmovetopoint (Con2, width-20, 0);
Set the next coordinate point
Cgcontextaddlinetopoint (con2, width, 0);
Set the next coordinate point
Cgcontextaddlinetopoint (Con2, width, 20);
Cgcontextstrokepath (Con2);


Lower left corner

Get context
Cgcontextref Con1 =uigraphicsgetcurrentcontext ();
Set Line Style
Cgcontextsetlinecap (Con1, Kcglinecapround);
Set Line thickness width
Cgcontextsetlinewidth (Con1, 3.0);
Cgcontextdrawpath (Con1, Kcgpathstroke);
Set color
Cgcontextsetrgbstrokecolor (Con1, 1.0, 0, 1.0, 1.0);
Set a start path
Cgcontextbeginpath (Con1);
The starting point is set to (0,0): Note that this is the relative coordinate of the corresponding area in the context
Cgcontextmovetopoint (con1, 0, height-20);
Set the next coordinate point
Cgcontextaddlinetopoint (con1, 0, height);
Set the next coordinate point
Cgcontextaddlinetopoint (Con1, max, height);
Cgcontextstrokepath (Con1);


Lower right corner

Get context
Cgcontextref Con3 =uigraphicsgetcurrentcontext ();
Set Line Style
Cgcontextsetlinecap (Con3, Kcglinecapround);
Set Line thickness width
Cgcontextsetlinewidth (Con3, 3.0);
Cgcontextdrawpath (Con3, Kcgpathstroke);
Set color
Cgcontextsetrgbstrokecolor (Con3, 1.0, 1.0, 0.0, 1.0);
Set a start path
Cgcontextbeginpath (Con3);
The starting point is set to (0,0): Note that this is the relative coordinate of the corresponding area in the context
Cgcontextmovetopoint (Con3, width-20, height);
Set the next coordinate point
Cgcontextaddlinetopoint (con3, width, height);
Set the next coordinate point
Cgcontextaddlinetopoint (Con3, Width, height-20);
Cgcontextstrokepath (Con3);

}

Two-dimensional code