ios - 如何在自定义蒙版周围创建笔触？
<p><p>我正在尝试使用 UIimage 在蒙版周围创建边框。当我在代码中创建掩码时，它看起来很好:</p>
<pre><code>@IBOutlet weak var imageToBeMasked: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let mask = UIImageView(image: Image)
imageToBeMasked.mask = mask
}
</code></pre>
<p> <a href="/image/KgzPt.png" rel="noreferrer noopener nofollow"><img src="/image/KgzPt.png" alt="mask"/></a> </p>
<p>但是当我尝试在它周围创建一个笔触时，它似乎根本不使用 mask :</p>
<pre><code>@IBOutlet weak var imageToBeMasked: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let mask = UIImageView(image: Image)
// the layer used to mask the image view
let maskLayer = CAShapeLayer()
maskLayer.path = UIBezierPath(rect: mask.bounds).cgPath
imageToBeMasked.layer.mask = maskLayer
// the layer used to draw the border
let strokeLayer = CAShapeLayer()
strokeLayer.frame = imageToBeMasked.bounds
strokeLayer.fillColor = UIColor.clear.cgColor
strokeLayer.path = UIBezierPath(rect: mask.bounds).cgPath
strokeLayer.strokeColor = UIColor.black.cgColor
strokeLayer.lineWidth = 4
imageToBeMasked.layer.addSublayer(strokeLayer)
}
</code></pre>
<p> <a href="/image/nE7pc.png" rel="noreferrer noopener nofollow"><img src="/image/nE7pc.png" alt="stroke"/></a> </p>
<p>关于如何解决这个问题的任何线索？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p><code>CALayer</code> 不受掩码本身的影响。最快的方法是创建一个比原始图像稍大的新图像，将其放在原始图像后面并用颜色着色。</p>
<pre><code>let templateImage = originalImage.withRenderingMode(.alwaysTemplate)
strokeImageView.image = templateImage
strokeImageView.tintColor = .black
</code></pre></p>
<p style="font-size: 20px;">关于ios - 如何在自定义蒙版周围创建笔触？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/44988675/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/44988675/
</a>
</p>
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