| #pragma mark - 开始扫描
- (void)startScanning { // 1.建立输入设备(摄像头)
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil]; // 2.建立输入方式(Metadata)
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; // 3.建立会话,将输入和输出联系起来
AVCaptureSession *session = [[AVCaptureSession alloc] init];
[session addInput:input];
[session addOutput:output];
[output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]]; // 4.建立会话图层
AVCaptureVideoPreviewLayer *layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
layer.frame = self.view.bounds;
[self.view.layer insertSublayer:layer atIndex:0]; self.layer = layer; // 5.开始扫描
[session startRunning]; // 6.设置扫描的区域
CGSize size = [UIScreen mainScreen].bounds.size; CGFloat x = self.qrCodeView.frame.origin.y / size.height; CGFloat y = self.qrCodeView.frame.origin.x / size.width; CGFloat w = self.qrCodeView.frame.size.height / size.height; CGFloat h = self.qrCodeView.frame.size.width / size.width;
output.rectOfInterest = CGRectMake(x, y, w, h);
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { // 0.移除以前的绘制
for (CAShapeLayer *layer in self.layers) {
[layer removeFromSuperlayer];
} // 1.获取扫描结果
NSMutableString *resultMStr = [NSMutableString string]; for (AVMetadataMachineReadableCodeObject *result in metadataObjects) { // 1.1.获取扫描到的字符串
[resultMStr appendString:result.stringValue]; // 1.2.绘制扫描到内容的边框
[self drawEdgeBorder:result];
} // 2.显示结果
NSString *string = [resultMStr isEqualToString:@""] ? @"请将二维码放入输入框中" : resultMStr; self.resultLabel.text = string;
}
- (void)drawEdgeBorder:(AVMetadataMachineReadableCodeObject *)resultObjc { // 0.转化object
resultObjc = (AVMetadataMachineReadableCodeObject *)[self.layer transformedMetadataObjectForMetadataObject:resultObjc]; // 1.建立绘制的图层
CAShapeLayer *shapeLayer = [[CAShapeLayer alloc] init]; // 2.设置图层的属性
shapeLayer.fillColor = [UIColor clearColor].CGColor;
shapeLayer.strokeColor = [UIColor blueColor].CGColor;
shapeLayer.lineWidth = 5; // 3.建立贝塞尔曲线
// 3.1.建立贝塞尔曲线
UIBezierPath *path = [[UIBezierPath alloc] init]; // 3.2.将path移动到起始位置
int index = 0; for (id dict in resultObjc.corners) { // 3.2.1.获取点
CGPoint point = CGPointZero; CGPointMakeWithDictionaryRepresentation((CFDictionaryRef)dict, &point); // NSLog(@"%@", NSStringFromCGPoint(point));
// 3.2.2.判断如何使用该点
if (index == 0) {
[path moveToPoint:point];
} else {
[path addLineToPoint:point];
} // 3.2.3.下标值自动加1
index++;
} // 3.3.关闭路径
[path closePath]; // 4.画出路径
shapeLayer.path = path.CGPath; // 5.将layer添加到图册中
[self.view.layer addSublayer:shapeLayer]; // 6.添加到数组中
[_layers addObject:shapeLayer];
}
- (NSMutableArray *)layers { if (_layers == nil) {
_layers = [NSMutableArray array];
} return _layers;
}
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