adjust focal

Source/LBXScanWrapper.swift

@@ -280,6 +280,17 @@ open class LBXScanWrapper: NSObject,AVCaptureMetadataOutputObjectsDelegate {
  setTorch(torch: torch)
  }
 
+ ///调整焦距
+ open func adjustFocal(value:CGFloat){
+ let videoConnection:AVCaptureConnection = (self.stillImageOutput.connection(with: .video))!
+ self.previewLayer?.setAffineTransform(CGAffineTransform(scaleX: 1+value, y: 1+value))
+ do {
+ try self.input?.device.lockForConfiguration()
+ } catch {}
+ videoConnection.videoScaleAndCropFactor = 1+value
+ self.input?.device.unlockForConfiguration()
+ }
+
  //MARK: ------获取系统默认支持的码的类型
  static func defaultMetaDataObjectTypes() -> [AVMetadataObject.ObjectType] {
  var types =

swiftScan/QQScanViewController.swift

@@ -19,6 +19,11 @@ class QQScanViewController: LBXScanViewController {
  @brief 闪关灯开启状态
  */
  var isOpenedFlash: Bool = false
+
+ /**
+ @brief 缩放倍数
+ */
+ var scale:CGFloat = 0
 
 // MARK: - 底部几个功能：开启闪光灯、相册、我的二维码
 
@@ -114,6 +119,10 @@ class QQScanViewController: LBXScanViewController {
  bottomItemsView?.addSubview(btnMyQR)
 
  view.addSubview(bottomItemsView!)
+
+ //此处通过手势调整
+ let pinchGest:UIPinchGestureRecognizer = UIPinchGestureRecognizer.init(target: self, action: #selector(handlePinches(pinchGest:)))
+ self.view.addGestureRecognizer(pinchGest)
  }
 
  //开关闪光灯
@@ -137,5 +146,22 @@ class QQScanViewController: LBXScanViewController {
  let vc = MyCodeViewController()
  self.navigationController?.pushViewController(vc, animated: true)
  }
+
+ @objc func handlePinches(pinchGest:UIPinchGestureRecognizer){
+
+ var currentScale:CGFloat = self.scale + pinchGest.scale - 1.0;
+ if (currentScale > 2) {
+ currentScale = 2;
+ }
+ if (currentScale < 0) {
+ currentScale = 0;
+ }
+ //调整焦距缩放倍数
+ scanObj?.adjustFocal(value: currentScale)
+
+ if pinchGest.state == .ended || pinchGest.state == .cancelled{
+ self.scale = currentScale
+ }
+ }
 
 }