UIViewExtension

/// 尺寸
var size: CGSize {
  get {
    return self.frame.size
  }
  set(newValue) {
    self.frame.size = CGSize(width: newValue.width, height: newValue.height)
  }
}

/// 宽度
var width: CGFloat {
  get {
   return self.frame.size.width
  }
  set(newValue) {
   self.frame.size.width = newValue
  }
}

/// 高度
var height: CGFloat {
  get {
    return self.frame.size.height
  }
  set(newValue) {
    self.frame.size.height = newValue
  }
}

/// 横坐标
var x: CGFloat {
  get {
    return self.frame.minX
  }
  set(newValue) {
   self.frame = CGRect(x: newValue, y: y, width: width, height: height)
  }
}

/// 纵坐标
var y: CGFloat {
  get {
    return self.frame.minY
  }
  set(newValue) {
   self.frame = CGRect(x: x, y: newValue, width: width, height: height)
  }
}

/// 纵坐标
var y: CGFloat {
  get {
    return self.frame.minY
  }
  set(newValue) {
    self.frame = CGRect(x: x, y: newValue, width: width, height: height)
  }
}

/// 底端纵坐标
var bottom: CGFloat {
  get {
    return frame.origin.y + frame.size.height
  }
  set(newValue) {
    frame.origin.y = newValue - frame.size.height
  }
}

/// 中心横坐标
var centerX: CGFloat {
  get {
    return self.center.x
  }
  set(newValue) {
    center.x = newValue
  }
}

/// 中心纵坐标
var centerY: CGFloat {
  get {
    return center.y
  }
  set(newValue) {
    center.y = newValue
  }
}

/// 原点
var origin: CGPoint {
  get {
    return self.origin
  }
  set(newValue) {
    frame.origin = newValue
  }
}

/// 右上角坐标
var topRight: CGPoint {
  get {
    return CGPoint(x: frame.origin.x + frame.size.width, y: frame.origin.y)
  }
  set(newValue) {
    frame.origin = CGPoint(x: newValue.x - width, y: newValue.y)
  }
}

/// 右下角坐标
var bottomRight: CGPoint {
  get {
    return CGPoint(x: frame.origin.x + frame.size.width, y: frame.origin.y + frame.size.height)
  }
  set(newValue) {
    frame.origin = CGPoint(x: newValue.x - width, y: newValue.y - height)
  }
}

/// 左下角坐标
var bottomLeft: CGPoint {
  get {
    return CGPoint(x: frame.origin.x, y: frame.origin.y + frame.size.height)
  }
  set(newValue) {
    frame.origin = CGPoint(x: newValue.x, y: newValue.y - height)
  }
}

/// 获取UIView对象某个方向缩进指定距离后的方形区域
///
/// - Parameters:
///   - direction: 要缩进的方向
///   - distance: 缩进的距离
/// - Returns: 得到的区域
func cutRect(direction: Direction, distance: CGFloat) ->  CGRect {
  switch direction {
  case .top:
    return CGRect(x: 0, y: distance, width: self.width, height: self.height - distance)
  case .left:
    return CGRect(x: distance, y: 0, width: self.width - distance, height: self.height)
  case .right:
    return CGRect(x: 0, y: 0, width: self.width - distance, height: self.height)
  case .bottom:
    return CGRect(x: 0, y: 0, width: self.width, height: self.height - distance)
  }
}