54 lines
2.4 KiB
Swift
54 lines
2.4 KiB
Swift
//
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// Copyright 2022-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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import Foundation
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public extension NSAttributedString {
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/// Returns a new attributed string by removing all links from the receiver.
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@objc var vc_byRemovingLinks: NSAttributedString {
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let result = NSMutableAttributedString(attributedString: self)
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result.removeAttribute(.link, range: NSRange(location: 0, length: length))
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return result
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}
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/// Enumerate attribute for given key and conveniently ignore any attribute that doesn't match given generic type.
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///
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/// - Parameters:
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/// - attrName: The name of the attribute to enumerate.
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/// - enumerationRange: The range over which the attribute values are enumerated. If omitted, the entire range is used.
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/// - opts: The options used by the enumeration. For possible values, see NSAttributedStringEnumerationOptions.
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/// - block: The block to apply to ranges of the specified attribute in the attributed string.
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func vc_enumerateAttribute<T>(_ attrName: NSAttributedString.Key,
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in enumerationRange: NSRange? = nil,
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options opts: NSAttributedString.EnumerationOptions = [],
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using block: (T, NSRange, UnsafeMutablePointer<ObjCBool>) -> Void) {
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self.enumerateAttribute(attrName,
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in: enumerationRange ?? .init(location: 0, length: length),
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options: opts) { (attr: Any?, range: NSRange, stop: UnsafeMutablePointer<ObjCBool>) in
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guard let typedAttr = attr as? T else { return }
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block(typedAttr, range, stop)
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}
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}
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/// Creates a new attributed string with given alpha applied to all texts.
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///
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/// - Parameters:
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/// - alpha: Alpha value to apply
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/// - Returns: New attributed string with updated alpha
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@objc func withTextColorAlpha(_ alpha: CGFloat) -> NSAttributedString {
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let mutableString = NSMutableAttributedString(attributedString: self)
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mutableString.vc_enumerateAttribute(.foregroundColor) { (color: UIColor, range: NSRange, _) in
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let colorWithAlpha = color.withAlphaComponent(alpha)
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mutableString.addAttribute(.foregroundColor, value: colorWithAlpha, range: range)
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}
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return mutableString
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}
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}
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