前不久有網(wǎng)友跟我說，demo有bug不能運行，所以抽空改了一下，主要原因是swift版本問題，當初我寫這個demo的時候是Swift3.0 貝塔版，所以有些語法上的更新。
在過去的WWDC2016中，Apple Inc推出了新版Swift--Swift3.0；對于Swift3.0的語法什么的，在此就不聊了，畢竟人家還是個小白。
Apple Inc WWDC2016
書歸正傳，iOS7.0以前要使用二維碼掃描功能，需要借助兩大開源的組件ZBar和ZXing來實現(xiàn)，自iOS7.0之后可以使用自帶的AVFoundation框架實現(xiàn)二維碼掃描，而且效率更高。
因此實現(xiàn)二維碼掃描首先需要導(dǎo)入AVFoundation框架
- 1 導(dǎo)入AVFoundation框架
import AVFoundation
- 2 創(chuàng)建視圖預(yù)覽顯示并設(shè)置想實現(xiàn)的UI效果
//屏幕掃描區(qū)域視圖
//屏幕掃描區(qū)域視圖
let barcodeView = UIView(frame: CGRect(x: UIScreen.main.bounds.size.width * 0.2, y: UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width * 0.6, height: UIScreen.main.bounds.size.width * 0.6))
//掃描線
let scanLine = UIImageView()
var scanning : String!
var timer = Timer()
override init(frame: CGRect) {
super.init(frame: frame)
barcodeView.layer.borderWidth = 1.0
barcodeView.layer.borderColor = UIColor.white.cgColor
self.addSubview(barcodeView)
//設(shè)置掃描線
scanLine.frame = CGRect(x: 0, y: 0, width: barcodeView.frame.size.width, height: 5)
scanLine.image = UIImage(named: "QRCodeScanLine")
//添加掃描線圖層
barcodeView.addSubview(scanLine)
self.createBackGroundView()
self.addObserver(self, forKeyPath: "scanning", options: .new, context: nil)
timer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(moveScannerLayer(_:)), userInfo: nil, repeats: true)
}
- 3 實現(xiàn)背景灰色半透明，分四個View,設(shè)置所需要實現(xiàn)的樣式；同樣的也可以采用重寫drawRect方法來實現(xiàn)。
func createBackGroundView() {
let topView = UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height * 0.35))
let bottomView = UIView(frame: CGRect(x: 0, y: UIScreen.main.bounds.size.width * 0.6 + UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height * 0.65 - UIScreen.main.bounds.size.width * 0.6))
let leftView = UIView(frame: CGRect(x: 0, y: UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width * 0.2, height: UIScreen.main.bounds.size.width * 0.6))
let rightView = UIView(frame: CGRect(x: UIScreen.main.bounds.size.width * 0.8, y: UIScreen.main.bounds.size.height * 0.35, width: UIScreen.main.bounds.size.width * 0.2, height: UIScreen.main.bounds.size.width * 0.6))
topView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
bottomView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
leftView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
rightView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
let label = UILabel(frame: CGRect(x: 0, y: 10, width: UIScreen.main.bounds.size.width, height: 21))
label.textAlignment = .center
label.font = UIFont.systemFont(ofSize: 14)
label.textColor = UIColor.white
label.text = "將二維碼/條形碼放入掃描框內(nèi)，即自動掃描"
bottomView.addSubview(label)
self.addSubview(topView)
self.addSubview(bottomView)
self.addSubview(leftView)
self.addSubview(rightView)
}
- 4 在初始化視圖的時候添加觀察者，用于實現(xiàn)暫停掃描時，掃描線停止?jié)L動
self.addObserver(self, forKeyPath: "scanning", options: .new, context: nil)
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if scanning == "start" {
timer.fire()
}else{
timer.invalidate()
}
}
- 5 掃描線滾動動畫
//讓掃描線滾動
func moveScannerLayer(_ timer : Timer) {
scanLine.frame = CGRect(x: 0, y: 0, width: self.barcodeView.frame.size.width, height: 12)
UIView.animate(withDuration: 2) {
self.scanLine.frame = CGRect(x: self.scanLine.frame.origin.x, y: self.scanLine.frame.origin.y + self.barcodeView.frame.size.height - 10, width: self.scanLine.frame.size.width, height: self.scanLine.frame.size.height)
}
}
- 6 聲明背景視圖
//相機顯示視圖
let cameraView = ScannerBackgroundView(frame: UIScreen.main.bounds)
- 7 初始化捕捉設(shè)備、創(chuàng)建捕捉會話、輸入媒體類型、設(shè)置代理等
let captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
let input :AVCaptureDeviceInput
let output = AVCaptureMetadataOutput()
//捕捉異常,并處理異常
do{
input = try AVCaptureDeviceInput(device: captureDevice)
captureSession.addInput(input)
captureSession.addOutput(output)
}catch {
print("異常")
}
let dispatchQueue = DispatchQueue(label: "queue", attributes: [])
output.setMetadataObjectsDelegate(self, queue: dispatchQueue)
output.metadataObjectTypes = NSArray(array: [AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]) as [AnyObject]
let videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
videoPreviewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
videoPreviewLayer?.frame = cameraView.bounds
cameraView.layer.insertSublayer(videoPreviewLayer!, at: 0)
output.rectOfInterest = CGRect(x: 0.2, y: 0.2, width: 0.6, height: 0.6)
- 8 掃描結(jié)果處理(根據(jù)不同掃描結(jié)果，執(zhí)行不同的操作)
if metadataObjects != nil && metadataObjects.count > 0 {
let metaData : AVMetadataMachineReadableCodeObject = metadataObjects.first as! AVMetadataMachineReadableCodeObject
print(metaData.stringValue)
DispatchQueue.main.async(execute: {
let result = WebViewController()
result.url = metaData.stringValue
self.navigationController?.pushViewController(result, animated: true)
})
captureSession.stopRunning()
}
- 9 從相冊中獲取二維碼圖片進行識別，在此需要判斷相冊中獲取的圖片是否具有二維碼信息
let image = info[UIImagePickerControllerOriginalImage]
let imageData = UIImagePNGRepresentation(image as! UIImage)
let ciImage = CIImage(data: imageData!)
let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy: CIDetectorAccuracyLow])
let array = detector?.features(in: ciImage!)
let result : CIQRCodeFeature = array!.first as! CIQRCodeFeature
let resultView = WebViewController()
resultView.url = result.messageString
self.navigationController?.pushViewController(resultView, animated: true)
picker.dismiss(animated: true, completion: nil)
歐了，所有工作都已完成；由于本人是個菜鳥，思路僅供參考，如果有更好的思路，歡迎交流。
附上：
demo地址：demo下載
