如何禁用ScrollView項目上的多個按鈕顏色選擇？

Question

我正在開發一個照片編輯器移動應用程序，讓用戶單擊滾動視圖內的項目以在其上方顯示較大的圖像。

問題是，當我點擊多個項目時，它會一直顯示相同的藍色。

我要執行的操作是禁用多個選擇，以便在滾動視圖中的每個項目上一次僅顯示一種顏色。

這是我一直在使用的功能：

func ScrollFunctions() {


    var xCoord: CGFloat = 13
    let yCoord: CGFloat = 7
    let buttonWidth:CGFloat = 60
    let buttonHeight: CGFloat = 60
    let gapBetweenButtons: CGFloat = 5


    var itemCount = 0

    for i in 0..<CIFilterNames.count {
        itemCount = i

        // Button properties

        let filterButton = UIButton(type: .custom)
        filterButton.frame = CGRect(xCoord, yCoord, buttonWidth, buttonHeight)
        filterButton.tag = itemCount
        filterButton.addTarget(self, action: #selector(LooksViewController.filterButtonTapped(sender:)), for: .touchUpInside)
        filterButton.layer.cornerRadius = 0
        filterButton.clipsToBounds = true

        // Create filters for each button

        currentFilter = CIFilter(name: "\(CIFilterNames[i])" )
        let ciContext = CIContext(options: nil)
        let coreImage = CIImage(image: imagePassed)
        let filter = CIFilter(name: "\(CIFilterNames[i])" )
        filter!.setDefaults()
        filter!.setValue(coreImage, forKey: kCIInputImageKey)
        let filteredImageData = filter!.value(forKey: kCIOutputImageKey) as! CIImage
        let filteredImageRef = ciContext.createCGImage(filteredImageData, from: filteredImageData.extent)
        let imageForButton = UIImage(cgImage: filteredImageRef!);
        // Assign filtered image to the button
        filterButton.setBackgroundImage(imageForButton, for: .normal)


        // Add Buttons in the Scroll View
        xCoord +=  buttonWidth + gapBetweenButtons
        filtersScrollView.addSubview(filterButton)
    }

    // Resize Scroll View
    filtersScrollView.contentSize = CGSize(buttonWidth * CGFloat(itemCount+2), yCoord)

}

當您點擊滾動視圖項目時，這是該功能。 在這里，我一直在嘗試'if else'語句，例如，如果按鈕處於選中狀態，則顯示邊框的寬度和顏色，否則返回false，但這沒有用。 有任何想法嗎？

@objc func filterButtonTapped(sender: UIButton) {
    let button = sender as UIButton
    button.layer.borderWidth = 2
    button.layer.borderColor = #colorLiteral(red: 0.1882352941, green: 0.6392156863, blue: 0.6705882353, alpha: 1)
    imgView.image = imagePassed
    toolBar.isHidden = true
    yesAndNoToolBar.isHidden = false
    imgView.image = button.backgroundImage(for: UIControlState.normal)

}

Answer 1

好的，您可以采用如下所示的一個成員變量。

var lastSelectedButton: UIButton?

現在在filterButtonTapped(sender: UIButton)函數中檢查lastSelectedButton

let button = sender as UIButton
if let button1 = lastSelectedButton {
// Deselect or reset this button1 color.
} 
lastSelectedButton = button
// Do your stuff here what you are doing now.

如果有任何疑問，請評論。