Ios 如何使边框与图像保持x距离？

我希望图像周围有一个边框，但我希望边框与实际图像保持一定距离。现在，它会在图像周围创建一个边框。我该怎么做

 let image = UIImage(named: "WhitePeeyr")!
    let imageView = UIImageView(image: image)
    let padding = CGFloat(20)
    let frame = CGRectMake(0, 0, 100 + 2*padding, 40 + 2*padding)


    imageView.frame = CGRectInset(frame, padding, padding)
    imageView.frame.origin.y = view.frame.size.height - 542
    imageView.frame.origin.x = (self.view.bounds.size.width - imageView.frame.size.width) / 2.0
    view.addSubview(imageView)

    let borderView = UIView(frame: frame)
    borderView.layer.borderWidth = 2.0
    borderView.layer.borderColor = UIColor.whiteColor().CGColor
    borderView.clipsToBounds = true
    view.addSubview(borderView)

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您将需要两个单独的视图或图层：

let image = UIImage(named: "image")!
let padding = CGFloat(20)
let frame = CGRectMake(0, 0, image.size.width + 2*padding, image.size.height + 2*padding)

let borderView = UIView(frame: frame)
borderView.layer.borderWidth = 2.0
borderView.layer.borderColor = UIColor.whiteColor().CGColor
borderView.clipsToBounds = true
view.addSubview(borderView)

let imageView = UIImageView(image: image)
imageView.frame = CGRectInset(frame, padding, padding)
view.addSubview(imageView)

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如何调整图像的大小？通过改变帧更新了我的代码，图像改变了位置，但是边界在某个点上表示出来。