Swift 3:如何创建 UIImageView 的模糊侧边/角? [英] Swift 3: How to create blurred side edges/corners of a UIImageView?

问题描述

目前我有一个 CALayer 应用于 UIImageView 像这样:

Currently I have a CALayer applied to a UIImageView like so:

let l: CALayer = imageView.layer
l.masksToBounds = true
l.cornerRadius = 20.0

我想实现如下所示的模糊效果:

I'd like to achieve the following blurred effect as shown:

我尝试了以下方法:

let blurEffect = UIBlurEffect(style: .light)

let visualEffectView = UIVisualEffectView(effect: blurEffect)
imageView.addSubview(visualEffectView)

以及:

var visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))

visualEffectView.frame = staffImageView.bounds

imageView.addSubview(visualEffectView)

然而，两者都没有达到我想要的结果.

However, both do not achieve the results I want.

有人可以提供帮助吗?这看起来很简单，但我就是做不到.

Can someone provide help on this? This seems rather simple, but I just cannot achieve it.

更新:我试图玩弄渐变，但运气不佳:

UPDATE: I've tried to play around with the gradient but not having much luck:

var maskLayer = CAGradientLayer()
maskLayer.frame = cell.imageView.bounds
let black = UIColor.white.cgColor
let clear = UIColor(white: 1, alpha: 0).cgColor
maskLayer.colors = [black, clear]
maskLayer.locations = [0.0, 0.10]
maskLayer.startPoint = CGPoint(x: 1, y: 0)
maskLayer.endPoint = CGPoint(x: 1, y: 1)
cell.imageView.layer.addSublayer(maskLayer)

结果:

推荐答案

Swift 4

let maskLayer = CAGradientLayer()
maskLayer.frame = yourImageView.bounds
maskLayer.shadowRadius = 5
maskLayer.shadowPath = CGPath(roundedRect: YourImagView.bounds.insetBy(dx: 5, dy: 5), cornerWidth: 10, cornerHeight: 10, transform: nil)
maskLayer.shadowOpacity = 1
maskLayer.shadowOffset = CGSize.zero
maskLayer.shadowColor = UIColor.white.cgColor        
yourImageView.layer.mask = maskLayer

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