app调用摄像头扫码二维码
时间: 2023-08-01 11:08:32 浏览: 78
你可以使用移动应用开发平台提供的摄像头接口来调用摄像头扫描二维码。具体实现方式取决于你使用的开发平台和编程语言。以下是一个简单的示例,以iOS平台为例:
1. 导入所需的库和框架:
```swift
import AVFoundation
```
2. 设置摄像头扫描界面:
```swift
class ScannerViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
var captureSession: AVCaptureSession!
var previewLayer: AVCaptureVideoPreviewLayer!
override func viewDidLoad() {
super.viewDidLoad()
let captureDevice = AVCaptureDevice.default(for: AVMediaType.video)
do {
let input = try AVCaptureDeviceInput(device: captureDevice!)
captureSession = AVCaptureSession()
captureSession.addInput(input)
let captureMetadataOutput = AVCaptureMetadataOutput()
captureSession.addOutput(captureMetadataOutput)
captureMetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
captureMetadataOutput.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer.frame = view.layer.bounds
view.layer.addSublayer(previewLayer)
captureSession.startRunning()
} catch {
print(error)
}
}
// 处理扫描到的二维码
func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
if metadataObjects.count > 0 {
if let metadataObj = metadataObjects[0] as? AVMetadataMachineReadableCodeObject {
if metadataObj.type == AVMetadataObject.ObjectType.qr {
print(metadataObj.stringValue)
}
}
}
}
}
```
3. 在需要调用摄像头扫描二维码的地方,跳转到扫描界面:
```swift
let scannerViewController = ScannerViewController()
navigationController?.pushViewController(scannerViewController, animated: true)
```
以上是一个简单的示例,涉及到iOS平台上使用AVFoundation库调用摄像头进行二维码扫描。其他平台和语言的实现方式可能会有所不同,你可以根据自己的开发环境进行相应的调整。