打印UIView的所有子节点结构

gistfile1.txt

func hierarchyOfView(_ view: UIView, level: Int = 1) {
    let subviews = view.subviews
    if subviews.isEmpty { return }

    for subview in subviews {
        var blank = ""
        for _ in 1..<level {
            blank += "-"
        }

        print(blank + "\(level): " + subview.self)

        hierarchyOfView(subview, level: level + 1)
    }
}