首先导入框架
然后通过滤镜CIFiter生成二维码
#import <CoreImage/CoreImage.h>
/**
* 生成二维码
*/
- (void)creat
{
//1.创建过滤对象
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
//2.设置相关属性
[filter setDefaults];
//3.设置输入数据
NSString *inputData = @"http://www.baidu.com";
NSData *data = [inputData dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKeyPath:@"inputMessage"];
//4.获取输出结果
CIImage *outputImage = [filter outputImage];
//5.显示二维码
// self.imageView.image = [UIImage imageWithCIImage:outputImage];
self.imageView.image = [UIImage createNonInterpolatedUIImageFormCIImage:outputImage withSize:200 ];
}
#import <AVFoundation/AVFoundation.h>
@property (nonatomic, weak) AVCaptureSession *session;
@property (nonatomic, weak) AVCaptureVideoPreviewLayer *layer;
/**
* 扫描二维码
*/
- (void)scan
{
//1.创建捕捉会话
AVCaptureSession *session = [[AVCaptureSession alloc] init];
// 2.添加输入设备(数据从摄像头输入)
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
[session addInput:input];
// 3.添加输出数据(示例对象-->类对象-->元类对象-->根元类对象)
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[session addOutput:output];
// 3.1.设置输入元数据的类型(类型是二维码数据)
[output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
// 4.添加扫描图层
AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:session];
layer.frame = self.view.bounds;
[self.view.layer addSublayer:layer];
self.layer = layer;
// 5.开始扫描
[session startRunning];
}
#pragma mark - 实现output的回调方法
// 当扫描到数据时就会执行该方法
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
if (metadataObjects.count > 0) {
AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject];
NSLog(@"%@", object.stringValue);
// 停止扫描
[self.session stopRunning];
// 将预览图层移除
[self.layer removeFromSuperlayer];
} else {
NSLog(@"没有扫描到数据");
}
}