IOS UIImageView有类似Android WRAP_CONTENT的功能

// 创建UIImageView对象并设置图片
let imageView = UIImageView(image: UIImage(named: "image.png"))

// 禁用自动布局的默认行为
imageView.translatesAutoresizingMaskIntoConstraints = false

// 添加UIImageView到父视图中
parentView.addSubview(imageView)

// 添加约束条件
imageView.leadingAnchor.constraint(equalTo: parentView.leadingAnchor, constant: 20).isActive = true
imageView.topAnchor.constraint(equalTo: parentView.topAnchor, constant: 20).isActive = true
imageView.trailingAnchor.constraint(equalTo: parentView.trailingAnchor, constant: -20).isActive = true
imageView.bottomAnchor.constraint(equalTo: parentView.bottomAnchor, constant: -20).isActive = true

// 根据需求设置约束条件的优先级
imageView.setContentCompressionResistancePriority(.required, for: .vertical)
imageView.setContentHuggingPriority(.required, for: .vertical)