1. 生成二维码
-(void)生成二维码
{
UIImageView *_imgView=[[UIImageView alloc]initWithFrame:CGRectMake(100, 100, [UIScreen mainScreen].bounds.size.width/2.0, [UIScreen mainScreen].bounds.size.width/2.0)];
[self.view addSubview:_imgView];
//二维码滤镜
CIFilter *filter=[CIFilter filterWithName:@"CIQRCodeGenerator"];
//恢复滤镜的默认属性
[filter setDefaults];
//将字符串转换成NSData
NSData *data=[@"www.baidu.com" dataUsingEncoding:NSUTF8StringEncoding];
//通过KVO设置滤镜inputmessage数据
[filter setValue:data forKey:@"inputMessage"];
//获得滤镜输出的图像
CIImage *outputImage=[filter outputImage];
//将CIImage转换成UIImage,并放大显示
_imgView.image=[self createNonInterpolatedUIImageFormCIImage:outputImage withSize:100.0];
//如果还想加上阴影，就在ImageView的Layer上使用下面代码添加阴影
_imgView.layer.shadowOffset=CGSizeMake(0, 0.5);//设置阴影的偏移量
_imgView.layer.shadowRadius=1;//设置阴影的半径
_imgView.layer.shadowColor=[UIColor blackColor].CGColor;//设置阴影的颜色为黑色
_imgView.layer.shadowOpacity=0.3;
}
//改变二维码大小
- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
CGRect extent = CGRectIntegral(image.extent);
CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
// 创建bitmap;
size_t width = CGRectGetWidth(extent) * scale;
size_t height = CGRectGetHeight(extent) * scale;
CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapRef, scale, scale);
CGContextDrawImage(bitmapRef, extent, bitmapImage);
// 保存bitmap到图片
CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return [UIImage imageWithCGImage:scaledImage];
}
2. 扫描二维码
-(void)扫描二维码
// 1. 实例化拍摄设备
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// 2. 设置输入设备
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
// 3. 设置元数据输出
// 3.1 实例化拍摄元数据输出
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
//设置扫描区域
// output.rectOfInterest = CGRectMake(CGRectGetMinX(BOX_FRAME)/CGRectGetWidth(frame), CGRectGetMinY(BOX_FRAME)/CGRectGetHeight(frame), CGRectGetMaxX(BOX_FRAME)/CGRectGetWidth(frame),CGRectGetMaxY(BOX_FRAME)/CGRectGetHeight(frame));
// 3.3 设置输出数据代理
[output setMetadataObjectsDelegate:delegate queue:dispatch_get_main_queue()];
// 4. 添加拍摄会话
// 4.1 实例化拍摄会话
_session = [[AVCaptureSession alloc] init];
// 4.2 添加会话输入
[_session addInput:input];
// 4.3 添加会话输出
[_session addOutput:output];
// 4.3 设置输出数据类型，需要将元数据输出添加到会话后，才能指定元数据类型，否则会报错
[output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
// 5. 视频预览图层
// 5.1 实例化预览图层, 传递_session是为了告诉图层将来显示什么内容
AVCaptureVideoPreviewLayer *preview = [AVCaptureVideoPreviewLayer layerWithSession:_session];
preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
preview.frame = self.bounds;
// 5.2 将图层插入当前视图
[self.layer addSublayer:preview];
// 6. 启动会话
[_session startRunning];
}
#pragma mark delegateMethod
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
// 1. 如果扫描完成，停止会话
[_session stopRunning];
if (metadataObjects.count > 0)
{
AVMetadataMachineReadableCodeObject *obj = metadataObjects[0];
NSLog(@"%@",obj.stringValue);
}
}
效果图
demo地址
