Question

通过VNRecognizeTextRequest，我从特定的boundingBox中获取以下坐标：（0.21611927830895714、0.4163079471243136、0.017705895179925962、0.1368724813140948）。

我的问题是如何使用这些boundingBox坐标在UIImageView顶部绘制矩形？

Answer 1

要从标准化坐标转换为图像坐标，可以使用以下

let rectInImage = VNImageRectForNormalizedRect(boundingBox, image.size.width, image.size.height)

您可以从此处使用UIBezierPath绘制路径：

func drawRect(_ rect: CGRect, layer: CALayer) {
    let center = CGPoint(x: rect.midX, y: rect.midY)
    let path: UIBezierPath = UIBezierPath(rect: rect)

    let rectShape: CAShapeLayer = CAShapeLayer()
    rectShape.path = path.cgPath
    rectShape.position = center
    rectShape.bounds = rect

    rectShape.strokeColor = UIColor.green.cgColor
    rectShape.fillColor = UIColor.clear.cgColor
    rectShape.lineWidth = 1.0

    layer.addSublayer(rectShape)
}

使用boundingBox绘制矩形

1 个答案: