二维码

filter 滤镜

使用二维码要使用这个框架

生成二维码

#import"ViewController.h"

#import

@interfaceViewController()

@property(weak,nonatomic)IBOutletUIImageView*Qrcode;//Qr code二维码

@end

@implementationViewController

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event{

//1.实例化二维码滤镜CIQRCodeGenerator是一个固定的值

CIFilter*filter = [CIFilterfilterWithName:@"CIQRCodeGenerator"];

//2.恢复滤镜的默认属性,因为可能保存有上一次滤镜的属性

[filtersetDefaults];

//3.将字符串转为NSData数据

NSData*data = [@"http://www.baidu.com"dataUsingEncoding:NSUTF8StringEncoding];

//4.通过KVO设置滤镜,传入data ,将来滤镜就知道通过data来生成二维码

//inputMessage是一个固定的值

[filtersetValue:dataforKey:@"inputMessage"];

//5.通过滤镜生成二维码

CIImage*ciImage = [filteroutputImage];

//6.将CIImage转为UIImage

UIImage*uiImage = [UIImageimageWithCIImage:ciImage];

//7.展示二维码

self.Qrcode.image= uiImage;

}

@end

扫描二维码

#import"ViewController.h"

#import

@interfaceViewController()

@property(nonatomic,strong)AVCaptureSession*session;

@property(nonatomic,strong)AVCaptureVideoPreviewLayer*preview;

@property(weak,nonatomic)IBOutletUILabel*labelView;

@end

@implementationViewController

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event{

//1.实例化拍摄设备

AVCaptureDevice*device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

//2.设置输入设备

AVCaptureDeviceInput*input = [AVCaptureDeviceInputdeviceInputWithDevice:deviceerror:nil];

//3.设置元数据输出

//3.1实例化拍摄元数据输出

AVCaptureMetadataOutput*output = [[AVCaptureMetadataOutputalloc]init];

//3.2设置输出数据的代理

[outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];

//4.添加拍摄会话

//4.1实例化拍摄会话

AVCaptureSession*session = [[AVCaptureSessionalloc]init];

//4.2添加输出会话

[sessionaddOutput:output];

//4.3添加输入会话

[sessionaddInput:input];

//4.4设置输出数据类型,必须先将元数据输出添加到会话中,才能设置元数据类型,否则会报错

[outputsetMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];

self.session= session;

//5.实例化预览图层

//5.1实例化预览图层,传递_session是为了告诉预览图层要显示什么内容的

AVCaptureVideoPreviewLayer*preview = [AVCaptureVideoPreviewLayerlayerWithSession:_session];

//5.2设置预览图层的属性

preview.videoGravity=AVLayerVideoGravityResizeAspectFill;

preview.frame=self.view.bounds;

//5.3将图层添加到当前视图

[self.view.layerinsertSublayer:previewatIndex:100];

self.preview= preview;

//6.启动会话

[_sessionstartRunning];

}

/**

*  AVCaptureMetadataOutputObjectsDelegate方法

*/

-(void)captureOutput:(AVCaptureOutput*)captureOutput didOutputMetadataObjects:(NSArray*)metadataObjects fromConnection:(AVCaptureConnection*)connection{

//1.如果扫描成功,停止会话

[self.sessionstopRunning];

//2.移除预览图层

[self.previewremoveFromSuperlayer];

if(metadataObjects.count>0) {

AVMetadataMachineReadableCodeObject*obj = metadataObjects[0];

self.labelView.text= obj.stringValue;

}

}

@end