Question

点击视图并从视图内的图像中获取正确的像素数据似乎存在问题。

func handleTap(gestureRecognizer: UIGestureRecognizer) {
    print("You tapped at \(gestureRecognizer.locationInView(self.view))")
     print("You tapped at \(gestureRecognizer.locationInView(view))")
     print(pickerImage.image!.size.height)
     print(pickerImage.image!.size.width)
    //imageViewOutlet.frame = CGRectMake(0 , 0, pickerImage.image!.size.width, pickerImage.image!.size.height)
     let point = gestureRecognizer.locationInView(self.view)
     let xPoint = (point.x * 0.91777)
     let yPoint = point.y
     let image : UIImage = pickerImage.image!;
     let color = image.getPixelColor(CGPointMake(xPoint, yPoint))
     colorText.backgroundColor = color;
     colorText2.text = color.htmlRGBColor
}

高度为300的容器内的照片没有相同的像素数据“你点击了（369.0,214.33332824707）”

相反，当我点击两侧与屏幕上的图像相比时，大约有35px的顶部布局指南（电池条所在的位置）和x Scale的比例差异为.9177。

以下是图片

的容器声明

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum) {
            print("Button capture")
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum;
            imagePicker.allowsEditing = false
            self.presentViewController(imagePicker, animated: true, completion: nil)
        }
    }

    func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: NSDictionary!){
        self.dismissViewControllerAnimated(true, completion: { () -> Void in

        })

//        imageTemp.image = image
        pickerImage.image = resizeImage(image, newHeight: CGFloat(300))
       // pickerImage.image = image
    }

以下是代码如何在文件外部扩展

import Foundation
import UIKit

extension UIImage {
    func getPixelColor(pos: CGPoint) -> UIColor {
        let pixelData = CGDataProviderCopyData(CGImageGetDataProvider(self.CGImage))
        let data: UnsafePointer<UInt8> = CFDataGetBytePtr(pixelData)
        let pixelInfo: Int = ((Int(self.size.width) * Int(pos.y)) + Int(pos.x)) * 4
        let r = CGFloat(data[pixelInfo]) / CGFloat(255.0)
        let g = CGFloat(data[pixelInfo+1]) / CGFloat(255.0)
        let b = CGFloat(data[pixelInfo+2]) / CGFloat(255.0)
        let a = CGFloat(data[pixelInfo+3]) / CGFloat(255.0)
        return UIColor(red: r, green: g, blue: b, alpha: a);
    }
}

extension UIColor{
    func rgb() -> Int? {
        var fRed: CGFloat = 0
        var fGreen: CGFloat = 0
        var fBlue: CGFloat = 0
        var fAlpha: CGFloat = 0
        if self.getRed(&fRed, green: &fGreen, blue: &fBlue, alpha: &fAlpha) {
            let iRed = Int(fRed * 255.0)
            let iGreen = Int(fGreen * 255.0)
            let iBlue = Int(fBlue * 255.0)
            let iAlpha = Int(fAlpha * 255.0)
            //  (Bits 24-31 are alpha, 16-23 are red, 8-15 are green, 0-7 are blue).
            let rgb = (iAlpha << 24) + (iRed << 16) + (iGreen << 8) + iBlue
            return rgb
        } else {
            // Could not extract RGBA components:
            return 4
        }
    }
}

我也在使用此answer

的扩展程序

我要做的是只允许屏幕接受高度为300的容器内的触摸，并且UIImage位于该容器内。当用户获取容器的坐标时，我将这些坐标连接到该容器内图像的像素数据时失败。

尝试：使用x坐标的比例将较大的图像重新缩放到仅高度300 将y刻度减小30（顶部条的高度）将图像的x比例计算为坐标的大小

从xcode上的触摸屏坐标获取ImageView的像素数据？

0 个答案: