Swift - 自定义单元格内容（UILabel、UIImageView）

Question

我想自定义我的UICollectionViewCell，但它不能像我希望的那样工作。

这是我的第一个单元格的代码：

class MainWishlistCell: UICollectionViewCell {
    let wishlistImage: UIImageView = {
        let v = UIImageView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.image = UIImage(named: "logoGroß")
        v.layer.cornerRadius = 3.0
        v.layer.shadowColor = UIColor.black.cgColor
        v.layer.shadowOffset = CGSize(width: 3, height: 3)
        v.layer.masksToBounds = false
        return v
    }()

    let wishlistLabel: UILabel = {
        let v = UILabel()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.text = "Main Wishlist"
        v.font = UIFont(name: "Avenir Next-Bold", size: 18)
        v.textColor = .darkGray
        v.textAlignment = .center
        return v
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }

    func commonInit() -> Void {
        contentView.addSubview(wishlistImage)
        contentView.addSubview(wishlistLabel)
        // constrain view to all 4 sides
        NSLayoutConstraint.activate([
            wishlistImage.topAnchor.constraint(equalTo: contentView.topAnchor),
            wishlistImage.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
            wishlistImage.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
            wishlistImage.heightAnchor.constraint(equalToConstant:150),

            wishlistLabel.topAnchor.constraint(equalTo: wishlistImage.bottomAnchor,constant: 1),
            wishlistLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
            wishlistLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
            wishlistLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
        ])
    }
}

它看起来像这样：

1.问题 - 为什么标签不是bold？

2。问题 - 为什么没有cornerRadius？

3.问题 - 为什么shadow 没有出现（底部+右侧）？

Answer 1

对于@pigeon_39 所说的第一个问题，您应该写出没有空格的字体名称。

对于第二个和第三个问题，你可以使用这个解决方案：

func addShadow() {
    let cornerRadius: CGFloat = 5
    self.wishlistImage.layer.shadowPath = UIBezierPath(roundedRect: self.wishlistImage.bounds, cornerRadius: cornerRadius).cgPath
    self.wishlistImage.layer.shadowRadius = cornerRadius
    self.wishlistImage.layer.shadowOffset = .zero
    self.wishlistImage.layer.shadowOpacity = 0.3
    self.wishlistImage.layer.shadowRadius = 10
    self.wishlistImage.layer.cornerRadius = cornerRadius
    self.wishlistImage.layer.shadowColor = UIColor.black.cgColor
}

并在设置约束后调用它。

Answer 2

试试这个

1. 问题：1

v.font = UIFont(name: "AvenirNext-Bold", size: 18)//删除Avenir和Next之间的空格

1. 问题：2 & 3

将此扩展添加到您的项目中

extension UIImageView {

    func addShadow(offset: CGSize, color: UIColor, radius: CGFloat, opacity: Float)
    {
        layer.masksToBounds = false
        layer.shadowOffset = offset
        layer.shadowColor = color.cgColor
        layer.shadowRadius = radius
        layer.shadowOpacity = opacity
    }
}

然后这样称呼它

let wishlistImage: UIImageView = {
        let v = UIImageView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.image = UIImage(named: "logoGroß")
        v.layer.cornerRadius = 3.0
        v.addShadow(offset: CGSize(width: 3, height: 3), color: UIColor.black, radius: 2.0, opacity: 1.0)
        return v
    }()