在 stackView 中调整图像大小，保持纵横比

Question

我想克隆 Apple Maps App UIButtons，它们看起来像这样：

这是我的代码：

 class CustomView: UIImageView {
    init(frame: CGRect, corners: CACornerMask, systemName: String) {
        super.init(frame: frame)
        self.createBorders(corners: corners)
        self.createImage(systemName: systemName)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func createBorders(corners: CACornerMask) {
        self.contentMode = .scaleAspectFill
        self.clipsToBounds = false
        self.layer.cornerRadius = 10
        self.layer.maskedCorners = corners
        self.layer.masksToBounds = false
        self.layer.shadowOffset = .zero
        self.layer.shadowColor = UIColor.gray.cgColor
        self.layer.shadowRadius = 10
        self.layer.shadowOpacity = 0.2
        self.backgroundColor = .white
        let shadowAmount: CGFloat = 2
        let rect = CGRect(x: 0, y: 2, width: self.bounds.width + shadowAmount * 0.1, height: self.bounds.height + shadowAmount * 0.1)
        self.layer.shadowPath = UIBezierPath(rect: rect).cgPath

    }
    
    func createImage(systemName: String) {
        let image = UIImage(systemName: systemName)!
//        let renderer = UIGraphicsImageRenderer(bounds: self.frame)
//        let renderedImage = renderer.image { (_) in
//            image.draw(in: frame.insetBy(dx: 16, dy: 30))
//        }
//      self.image = renderedImage.withRenderingMode(.alwaysTemplate)
        self.image = image
    }
}

并像这样使用它：

 let size = CGSize(width: 10, height: 10)
    let frame = CGRect(origin: CGPoint(x: 360, y: 45), size: size)
    let infoView = CustomView(frame: frame, corners: [.layerMinXMinYCorner, .layerMaxXMinYCorner], systemName: "info.circle")
    let locationView = CustomView(frame: frame, corners: [], systemName: "location")
    let plusView = CustomView(frame: frame, corners: [.layerMinXMaxYCorner, .layerMaxXMaxYCorner], systemName: "plus.circle")
    let binocularsView = CustomView(frame: frame, corners: [.layerMinXMinYCorner, .layerMinXMaxYCorner, .layerMaxXMinYCorner, .layerMaxXMaxYCorner], systemName: "binoculars.fill")
    let stackView = UIStackView(arrangedSubviews: [infoView, locationView, plusView, binocularsView])
    stackView.frame = CGRect(origin: CGPoint(x: 360, y: 45), size: CGSize(width: 45, height: 180))
    stackView.distribution = .fillEqually
    stackView.axis = .vertical
    stackView.setCustomSpacing(3, after: plusView)
    view.addSubview(stackView)

使用这段代码，它看起来像这样：

如您所见，图标太大...所以这就是我试图缩小它们的方法：（取消注释 createImage() 中的行）

func createImage(systemName: String) {
    let image = UIImage(systemName: systemName)!
    let renderer = UIGraphicsImageRenderer(bounds: self.frame)
    let renderedImage = renderer.image { (_) in
        image.draw(in: frame.insetBy(dx: 16, dy: 30))
    }
  self.image = renderedImage.withRenderingMode(.alwaysTemplate)
}

但后来它扭曲了...

能帮我吗？ :)

谢谢！！！

Answer 1

而不是继承 UIImageView 子类 UIView 并添加 UIImageView 作为子视图。然后您可以根据需要在图像周围创建尽可能多的间距。

class CustomView: UIView {

    lazy var imageView: UIImageView = {
        let imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        return imageView
    }()

    init(frame: CGRect, corners: CACornerMask, systemName: String) {
        super.init(frame: frame)
        self.setUpViews()
        // ...
    }

    func setUpViews() {
        addSubview(imageView)
        NSLayoutConstraint.activate([
            imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 5),
            imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -5),
            imageView.topAnchor.constraint(equalTo: topAnchor, constant: 5),
            imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -5),
        ])
    }

    func createImage(systemName: String) {
        let image = UIImage(systemName: systemName)!
        self.imageView.image = image
    }
}

在 stackView 中调整图像大小，保持纵横比

Resize Image in stackView, keep aspect-ratio

xcode

uikit

swift

uigraphicsimagerenderer