属性

获取父控制器

extension UIView {
     public var parentViewController: UIViewController? {
        weak var parentResponder: UIResponder? = self
        while parentResponder != nil {
            parentResponder = parentResponder!.next
            if let viewController = parentResponder as? UIViewController {
                return viewController
            }
        }
        return nil
    }
}

size

extension UIView {
     public var size: CGSize {
        get {
            return frame.size
        }
        set {
            width = newValue.width
            height = newValue.height
        }
    }
}

height

extension UIView {
     public var height: CGFloat {
        get {
            return frame.size.height
        }
        set {
            frame.size.height = newValue
        }
    }
}

width

extension UIView {
     public var width: CGFloat {
        get {
            return frame.size.width
        }
        set {
            frame.size.width = newValue
        }
    }
}

x

extension UIView {
     public var x: CGFloat {
        get {
            return frame.origin.x
        }
        set {
            frame.origin.x = newValue
        }
    }
}

y

extension UIView {
     public var y: CGFloat {
        get {
            return frame.origin.y
        }
        set {
            frame.origin.y = newValue
        }
    }
}

方法

第一响应者

extension UIView {
     public func firstResponder() -> UIView? {
        var views = [UIView](arrayLiteral: self)
        var i = 0
        repeat {
            let view = views[i]
            if view.isFirstResponder {
                return view
            }
            views.append(contentsOf: view.subviews)
            i += 1
        } while i < views.count
        return nil
    }
}

添加多个子视图

extension UIView {
   public func addSubviews(_ subviews: [UIView]) {
       subviews.forEach({ self.addSubview($0) })
   }
   
   public func removeSubviews() {
       subviews.forEach({ $0.removeFromSuperview() })
   }
}

资源来自网络和日常整理，持续更新