2022-04-05 10:09:37 +00:00
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//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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2022-04-27 09:55:23 +00:00
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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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2022-06-17 08:19:10 +00:00
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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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2022-04-27 09:55:23 +00:00
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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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2022-06-16 15:07:47 +00:00
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in enumerationRange: NSRange? = nil,
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2022-04-27 09:55:23 +00:00
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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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2022-06-16 15:07:47 +00:00
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in: enumerationRange ?? .init(location: 0, length: length),
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2022-04-27 09:55:23 +00:00
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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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2022-05-09 13:55:24 +00:00
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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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2022-06-16 15:07:47 +00:00
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mutableString.vc_enumerateAttribute(.foregroundColor) { (color: UIColor, range: NSRange, _) in
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2022-05-09 13:55:24 +00:00
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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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2022-04-05 10:09:37 +00:00
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}
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