Issue #603
Need to set correct frame for mask layer or UILabel, as it is relative to the coordinate of the view to be masked
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| let aView = UIView(frame: .init(x: 100, y: 110, width: 200, height: 100))
let textLayer = CATextLayer()
textLayer.foregroundColor = UIColor.white.cgColor
textLayer.string = "Hello world"
textLayer.font = UIFont.preferredFont(forTextStyle: .largeTitle)
textLayer.frame = aView.bounds
aView.layer.mask = textLayer
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Use sizeToFit to ensure frame for UILabel
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| let label = UILabel()
label.frame.origin = CGPoint(x: 80, y: 80)
label.textColor = UIColor.black
label.font = UIFont.preferredFont(forTextStyle: .largeTitle)
label.text = "ABC"
label.sizeToFit()
aView.mask = label
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Change bounds.origin
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| label.frame.origin = CGPoint(x: 50, y: 50)
aView.bounds.origin = label.frame.origin
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Adding label to view hierarchy seems to remove masking effect. Need to set mask later
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| view.addSubview(aView)
view.addSubview(label)
aView.mask = label
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Can’t add overlayView to UILabel and use UILabel as mask, cause cycler CALayer
After using UILabel as mask, its superview is nil
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| aView.mask = label
label.superview == nil
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Mask with snapshot from UILabel. Need to set correct frame for aView and maskLayer
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| let maskLayer = CALayer()
maskLayer.contents = label.makeScreenshot().cgImage
maskLayer.contentsGravity = .resizeAspect
aView.frame = label.bounds
maskLayer.frame = aView.bounds
aView.layer.mask = maskLayer
label.addSubview(aView)
extension UIView {
func makeScreenshot() -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: self.bounds)
return renderer.image { (context) in
self.layer.render(in: context.cgContext)
}
}
}
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