Question

我正在尝试在应用中实现“收藏夹”按钮，这是我的尝试。这是我目前拥有的：

let favoriteButton: UIButton = {
    let button = UIButton(type: .custom)
    var emptyHeartImg = UIImage(named: "emptyheart")
    var fullHeartImg = UIImage(named: "fullheart")
    emptyHeartImg = emptyHeartImg?.maskWithColor(color: UIColor(r: 128, g: 171, b: 103))
    fullHeartImg = fullHeartImg?.maskWithColor(color: UIColor(r: 128, g: 171, b: 103))
    let imageView = UIImageView(image: emptyHeartImg, highlightedImage: fullHeartImg)
    imageView.contentMode = .scaleAspectFill
    button.setImage(imageView.image, for: .normal)
    button.addTarget(self, action: #selector(handleFavorite), for: .touchUpInside)
    return button
}()

@objc private func handleFavorite() {
    if (favoriteButton.imageView?.isHighlighted)! == false {
        favoriteButton.imageView?.isHighlighted = true
    } else {
        favoriteButton.imageView?.isHighlighted = false
    }
}

当前，这并不能根据需要更改图像。有关实现“收藏夹”按钮的任何提示或替代方法？

Answer 1

我将使用UIButton.isSelected代替imageView的高亮状态。我不确定UIImageView，但是isHighlighted的按钮仅在它们被主动触摸时才出现，而不是在持久状态下。看到标有**的行：

let favoriteButton: UIButton = {
    let button = UIButton(type: .custom)
    var emptyHeartImg = UIImage(named: "emptyheart")
    var fullHeartImg = UIImage(named: "fullheart")
    emptyHeartImg = emptyHeartImg?.maskWithColor(color: UIColor(r: 128, g: 171, b: 103))
    fullHeartImg = fullHeartImg?.maskWithColor(color: UIColor(r: 128, g: 171, b: 103))
    **button.setImage(emptyHeartImg, for: .normal)
    **button.setImage(fullHeartImg, for: .selected)
    **button.imageView?.contentMode = .scaleAspectFill
    button.addTarget(self, action: #selector(handleFavorite), for: .touchUpInside)
    return button
}()

然后在您的处理程序中：

favoriteButton.isSelected = !favoriteButton.isSelected

在iOS中实现收藏夹按钮

1 个答案: