如何禁用ScrollView项目上的多按钮颜色选择

Question

我正在开发一个照片编辑器移动应用程序，让用户点击滚动视图中的一个项目，以显示其上方的较大图像。

问题是当我点击多个项目时，它一直显示相同的蓝色。

我想做的是禁用多项选择，这样滚动视图中的每个项目一次只显示一种颜色。

这是我一直在做的功能：

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)
}

这是当您点击滚动视图项目时的功能。在这里，我一直在尝试"if else"语句，比如如果按钮是选择，则显示边框宽度和颜色，否则返回false，但这并没有奏效。有什么想法吗？

@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，您可以使用一个成员变量，如下所示。

var lastSelectedButton: UIButton?

现在在filterButtonTapped(sender: UIButton)功能中检查最后一个SelectedButton

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.

如果有任何疑问，请发表评论。