将文本快速添加到图像中的一个点

Question

我正在使用 UITapGestureRecognizer 获取 UIImageView 中的坐标，然后将该坐标用作向图像添加文本的位置。文本未完全添加到我在 UIImageView 上触及的位置的问题 你能帮我解决问题或给我一些建议吗

    @IBOutlet var imageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        imageView.image = UIImage(named: documentsPath + "/bach.jpg")
        let imageViewTapped = UITapGestureRecognizer(target: self, action: #selector(self.tapAction(_:)))
        imageViewTapped.numberOfTouchesRequired = 1
        imageViewTapped.delegate = self
        imageView.addGestureRecognizer(imageViewTapped)
    }

    func tapAction(_ sender: UITapGestureRecognizer) {
        let point = sender.location(in: self.imageView)
        print("x \(point.x) y \(point.y) ")
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        let image = UIImage(named: documentsPath + "/bach.jpg")!
        let newImage = textToImage(drawText: "㊗️Hello", inImage: image, atPoint: CGPoint(x: point.x, y: point.y))
        imageView.image = newImage
    }

    // Add text to image
    func textToImage(drawText text: NSString, inImage image: UIImage, atPoint point: CGPoint) -> UIImage {
        let textColor = UIColor.white
        let textFont = UIFont(name: "Helvetica Bold", size: 300)!
        let scale = UIScreen.main.scale
        UIGraphicsBeginImageContextWithOptions(image.size, false, scale)

        let textFontAttributes = [
            NSFontAttributeName: textFont,
            NSForegroundColorAttributeName: textColor,
            ] as [String : Any]
        image.draw(in: CGRect(origin: CGPoint.zero, size: image.size))
        text.draw(at: point, withAttributes: textFontAttributes)

        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return newImage!
    }

Answer 1

class ViewController1: UIViewController {
let lblNew = UILabel()
@IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
    super.viewDidLoad()
    let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    imageView.image = UIImage(named: documentsPath + "/bach.jpg")
    imageView.isUserInteractionEnabled = true
    let imageViewTapped = UITapGestureRecognizer(target: self, action: #selector(self.tapAction(_:)))
    imageViewTapped.numberOfTouchesRequired = 1
    imageViewTapped.delegate = self as? UIGestureRecognizerDelegate
    imageView.addGestureRecognizer(imageViewTapped)
}

func tapAction(_ sender: UITapGestureRecognizer) {
    let point = sender.location(in: self.imageView)
    print("x \(point.x) y \(point.y) ")
    textToImage(drawText: "㊗️Hello", atPoint: CGPoint(x: point.x, y: point.y))

}

// Add text to image
func textToImage(drawText text: NSString, atPoint point: CGPoint) {

    lblNew.frame = CGRect(x: point.x, y: point.y, width: 200.0, height: 10)
    lblNew.textAlignment = .left
    lblNew.text = text as String
    lblNew.textColor = UIColor.white
    imageView.addSubview(lblNew)
}
}

Answer 2

将图像直接以 png 格式保存在文档中的代码。如果您想将其保存为 jpeg 格式，只需将 UIImagePNGRepresentation 行更改为 UIImageJPEGRepresentation(image, 0.9)。

func saveImage()
{
    if let image = UIImage(named: "test.png") {
        if let data = UIImagePNGRepresentation(image) {
            let filename = getDocumentsDirectory().appendingPathComponent("copy.png")
            try? data.write(to: filename)
        }
    }
}

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    let documentsDirectory = paths[0]
    return documentsDirectory
}

Answer 3

Replace your saveImage method with the following code snippet.

func saveImage()
{
  UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, UIScreen.main.scale)
  imageView.layer.render(in: UIGraphicsGetCurrentContext()!)
  let image = UIGraphicsGetImageFromCurrentImageContext()
  UIGraphicsEndImageContext()

  if let data = UIImagePNGRepresentation(image!) {
        let filename = getDocumentsDirectory().appendingPathComponent("copy.png")
        try? data.write(to: filename)
    }
}