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
