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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| // | ||
| // CarvedLabel.swift | ||
| // ImagePicker | ||
| // | ||
| // Created by Peter Stajger on 26/10/2017. | ||
| // Copyright © 2017 Inloop. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
|
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| fileprivate typealias TextAttributes = [NSAttributedStringKey: Any] | ||
|
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| /// | ||
| /// A label whose transparent text is carved into solid color. | ||
| /// | ||
| /// - please note that text is always aligned to center | ||
| /// | ||
| @IBDesignable | ||
| final class CarvedLabel : UIView { | ||
|
|
||
| @IBInspectable var text: String? { | ||
| didSet { | ||
| invalidateIntrinsicContentSize() | ||
| setNeedsDisplay() | ||
| } | ||
| } | ||
|
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| var font: UIFont? { | ||
| didSet { | ||
| invalidateIntrinsicContentSize() | ||
| setNeedsDisplay() | ||
| } | ||
| } | ||
|
|
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| @IBInspectable var cornerRadius: CGFloat = 0 { | ||
| didSet { setNeedsDisplay() } | ||
| } | ||
|
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| @IBInspectable var verticalInset: CGFloat = 0 { | ||
| didSet { | ||
| invalidateIntrinsicContentSize() | ||
| setNeedsDisplay() | ||
| } | ||
| } | ||
|
|
||
| @IBInspectable var horizontalInset: CGFloat = 0 { | ||
| didSet { | ||
| invalidateIntrinsicContentSize() | ||
| setNeedsDisplay() | ||
| } | ||
|
|
||
| } | ||
|
|
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| override init(frame: CGRect) { | ||
| super.init(frame: frame) | ||
| _ = backgroundColor | ||
| isOpaque = false | ||
| } | ||
|
|
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| required init?(coder aDecoder: NSCoder) { | ||
| super.init(coder: aDecoder) | ||
| _ = backgroundColor | ||
| isOpaque = false | ||
| } | ||
|
|
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| override var backgroundColor: UIColor? { | ||
| get { return UIColor.clear } | ||
| set { super.backgroundColor = UIColor.clear } | ||
| } | ||
|
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| fileprivate var textAttributes: TextAttributes { | ||
| let activeFont = font ?? UIFont.systemFont(ofSize: 12, weight: .regular) | ||
| return [ | ||
| NSAttributedStringKey.font: activeFont | ||
| ] | ||
| } | ||
|
|
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| fileprivate var attributedString: NSAttributedString { | ||
| return NSAttributedString(string: text ?? "", attributes: textAttributes) | ||
| } | ||
|
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| override func draw(_ rect: CGRect) { | ||
| let color = tintColor! | ||
| color.setFill() | ||
|
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| let path = UIBezierPath(roundedRect: rect, cornerRadius: cornerRadius) | ||
| path.fill() | ||
|
|
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| guard let context = UIGraphicsGetCurrentContext(), (text?.characters.count ?? 0) > 0 else { | ||
| return | ||
| } | ||
|
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| let attributedString = self.attributedString | ||
| let stringSize = attributedString.size() | ||
|
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| let xOrigin: CGFloat = max(horizontalInset, (rect.width - stringSize.width)/2) | ||
| let yOrigin: CGFloat = max(verticalInset, (rect.height - stringSize.height)/2) | ||
|
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| context.saveGState() | ||
| context.setBlendMode(.destinationOut) | ||
| attributedString.draw(at: CGPoint(x: xOrigin, y: yOrigin)) | ||
| context.restoreGState() | ||
| } | ||
|
|
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| override func sizeThatFits(_ size: CGSize) -> CGSize { | ||
| let stringSize = attributedString.size() | ||
| return CGSize(width: stringSize.width + horizontalInset*2, height: stringSize.height + verticalInset*2) | ||
| } | ||
|
|
||
| override var intrinsicContentSize: CGSize { | ||
| return sizeThatFits(.zero) | ||
| } | ||
| } |
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