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Main_VC.swift
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Main_VC.swift
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//
// Main_VC.swift
// Allergy Without StoryBoard
//
// Created by Colin Hu on 1/3/23.
//
import UIKit
import Vision
class Main_VC : UIViewController {
private let label: UILabel = {
let label = UILabel()
label.numberOfLines = 0
label.textAlignment = .center
label.text = "Starting..."
return label
}()
private let imageView: UIImageView = {
let imageView = UIImageView()
imageView.image = UIImage(named: "example2")
imageView.contentMode = .scaleAspectFit
return imageView
}()
override func viewDidLoad(){
super.viewDidLoad()
//view.addSubview(label)
//view.addSubview(imageView)
view.backgroundColor = .systemMint
recognizeText(image: imageView.image)
}
override func viewDidLayoutSubviews(){
super.viewDidLayoutSubviews()
imageView.frame = CGRect (
x:20,
y: view.safeAreaInsets.top,
width: view.frame.size.width-40,
height: view.frame.size.width-40)
label.frame = CGRect(x: 20,
y: view.frame.size.width + view.safeAreaInsets.top,
width: view.frame.size.width-40,
height: 200)
}
private func recognizeText(image: UIImage?) {
guard let cgImage = image?.cgImage else {
fatalError("could not get image")
}
//Handler
let handler = VNImageRequestHandler(cgImage: cgImage, options: [:])
//Request
let request = VNRecognizeTextRequest { [weak self] request, error in
guard let observations = request.results as? [VNRecognizedTextObservation],
error == nil else {
return
}
let text = observations.compactMap({
$0.topCandidates(1).first?.string
}).joined(separator: " ,")
DispatchQueue.main.async {
self?.label.text = text
}
}
//Process the Request
do {
try handler.perform([request])
}
catch{
label.text = ("\(error)")
}
}
}