- 获取带有文字的图片
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| func btnPressed(_ sender: Any) {
let picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .savedPhotosAlbum
present(picker, animated: true, completion: nil)
}
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func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
picker.dismiss(animated: true, completion: nil)
guard let image = (info[UIImagePickerControllerOriginalImage] as? UIImage) else {
fatalError("no image")
}
self.btnImageView.setBackgroundImage(image, for: .normal)
var textLayers:[CAShapeLayer] = []
if let cgImage = image.cgImage {
let textRecognizedRequest = VNDetectTextRectanglesRequest.init(completionHandler: { (request:VNRequest, error:Error?) in
if (request.results as? [VNTextObservation]) != nil {
textLayers = self.addShapesToText(obversations: request.results as! [VNTextObservation], view: self.btnImageView)
for layer in textLayers {
self.btnImageView.layer.addSublayer(layer)
}
}
})
let handler = VNImageRequestHandler.init(cgImage: cgImage, options: [:])
guard let _ = try? handler.perform([textRecognizedRequest]) else {
fatalError("failed")
}
}
}
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2.添加Layer展示
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| func addShapesToText(obversations:[VNTextObservation],view:UIView) -> [CAShapeLayer] {
let layers: [CAShapeLayer] = obversations.map { observation in
let w = observation.boundingBox.size.width * view.bounds.width
let h = observation.boundingBox.size.height * view.bounds.height
let x = observation.boundingBox.origin.x * view.bounds.width
let y = view.bounds.height - observation.boundingBox.origin.y * view.bounds.height - h
let layer = CAShapeLayer()
layer.frame = CGRect(x: x , y: y, width: w, height: h)
layer.borderColor = UIColor.green.cgColor
layer.borderWidth = 2
layer.cornerRadius = 3
return layer
}
return layers
}
|
3.效果展示
Demo下载
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