选中后更改imageView的tintColor无效

Question

我做了一个自定义菜单栏，现在我想为导航实现一个滑块。我将第一个图像设置为selectedItem，其颜色为.white，其他图像设置为.gray ..现在，我想单击其他图像并更改其.tintColor。这是指向整个code

的链接

let imageView: UIImageView = {
        let iv = UIImageView()
        iv.image = UIImage(named: "Plan")?.withRenderingMode(.alwaysTemplate)
        iv.tintColor = UIColor.black
        return iv
    }()

    override var isSelected: Bool {
        didSet {
            imageView.tintColor = isSelected ? .white : .gray
        }
    }

    override var isHighlighted: Bool {
        didSet {
            imageView.tintColor = isHighlighted ? .white : .white
        }
    }


    override func setupViews() {
        super.setupViews()

        addSubview(imageView)

        addConstraintsWithFormat("H:[v0(28)]", views: imageView)
        addConstraintsWithFormat("V:[v0(28)]", views: imageView)

        addConstraint(NSLayoutConstraint(item: imageView, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0))
        addConstraint(NSLayoutConstraint(item: imageView, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0))
    }

}

我应该能够单击其他图像并在取消选择其他图像的同时更改tintColor。

Answer 1

我认为collectionView's cellForItemAt方法collectionViewCell's isSelected中存在一些不一致之处。

1. 在cellForItemAt中，您正在设置cell.tintColor = .white

2. 在isSelected中，您正在设置imageView.tintColor = isSelected ? .white : .gray

尝试将cellForItemAt中的代码更改为

cell.imageView.tintColor = .gray

我已经创建了示例代码，以便您可以识别问题，

class ViewController: UIViewController, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 10
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CustomCell
        cell.imageView.tintColor = .gray
        return cell
    }
}

class CustomCell: UICollectionViewCell {
    @IBOutlet weak var imageView: UIImageView!

    override var isSelected: Bool {
        didSet {
            self.imageView.tintColor = isSelected ? .white : .gray
        }
    }
}