问题描述
我有一个关于扫描一维条码的问题。为什么我设置了扫描区域视图的黄色边框，只有我把它放在区域中间才能成功？
当我将我的一维条形码放入下图的绿色区域时，它工作正常。当我放置红色区域时，没有任何反应。我的应用方向只有左右。
我的代码有什么问题？
import UIKit
import AVFoundation
class ViewController: UIViewController,AVCaptureMetadataOutputObjectsDelegate,UIAlertViewDelegate {
var scanRectView:UIView!
var device:AVCaptureDevice!
var input:AVCaptureDeviceInput!
var output:AVCaptureMetadataOutput!
var session:AVCaptureSession!
var preview:AVCaptureVideoPreviewLayer!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidLayoutSubviews() {
self.configureVideoOrientation()
}
fileprivate func configureVideoOrientation() {
let previewLayer = self.preview
if let connection = previewLayer?.connection {
let orientation = UIDevice.current.orientation
if connection.isVideoOrientationSupported,let videoOrientation = AVCaptureVideoOrientation(rawValue: orientation.rawValue) {
previewLayer?.frame = self.view.bounds
connection.videoOrientation = videoOrientation
}
}
}
@IBAction func btnClicked(_ sender: Any) {
do{
self.device = AVCaptureDevice.default(for: AVMediaType.video)
self.input = try AVCaptureDeviceInput(device: device)
self.output = AVCaptureMetadataOutput()
output.setMetadataObjectsDelegate(self,queue: dispatchQueue.main)
self.session = AVCaptureSession()
if UIScreen.main.bounds.size.height < 500 {
self.session.sessionPreset = AVCaptureSession.Preset.vga640x480
}else{
self.session.sessionPreset = AVCaptureSession.Preset.high
}
self.session.addInput(self.input)
self.session.addOutput(self.output)
self.output.MetadataObjectTypes = [.qr,.ean8,.ean13,.pdf417,.code128,.aztec,.code39,.code39Mod43,.code93,.dataMatrix,.face,.interleaved2of5,.itf14,.upce]
let windowSize = UIScreen.main.bounds.size
let scanSize = CGSize(width:windowSize.width*1/3,height:windowSize.width*1/3)
var scanRect = CGRect(x:(windowSize.width-scanSize.width)/2,y:(windowSize.height-scanSize.height)/2,width:scanSize.width,height:scanSize.height)
scanRect = CGRect(x:scanRect.origin.y/windowSize.height,y:scanRect.origin.x/windowSize.width,width:scanRect.size.height/windowSize.height,height:scanRect.size.width/windowSize.width);
self.output.rectOfInterest = scanRect
self.preview = AVCaptureVideoPreviewLayer(session:self.session)
self.preview.videoGravity = AVLayerVideoGravity.resizeAspectFill
self.preview.frame = UIScreen.main.bounds
self.view.layer.insertSublayer(self.preview,at:0)
self.scanRectView = UIView();
self.view.addSubview(self.scanRectView)
self.scanRectView.frame = CGRect(x:0,y:0,height:scanSize.height);
self.scanRectView.center = CGPoint( x:UIScreen.main.bounds.midX,y:UIScreen.main.bounds.midY)
self.scanRectView.layer.borderColor = UIColor.yellow.cgColor
self.scanRectView.layer.borderWidth = 5;
self.session.startRunning()
do {
try self.device!.lockForConfiguration()
} catch _ {
NSLog("Error: lockForConfiguration.");
}
self.device!.videoZoomFactor = 1.5
self.device!.unlockForConfiguration()
}catch _ {
}
}
func MetadataOutput(_ output: AVCaptureMetadataOutput,didOutput MetadataObjects: [AVMetadataObject],from connection: AVCaptureConnection) {
var stringValue:String?
if MetadataObjects.count > 0 {
let MetadataObject = MetadataObjects[0] as! AVMetadataMachineReadableCodeObject
stringValue = MetadataObject.stringValue
if stringValue != nil{
self.session.stopRunning()
}
}
self.session.stopRunning()
}
}
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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