57 lines
2.1 KiB
Swift
57 lines
2.1 KiB
Swift
//
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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 Bundle {
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/// Get an lproj language bundle from the receiver bundle.
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/// - Parameter language: The language to try to load.
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/// - Returns: The lproj bundle if found otherwise nil.
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func lprojBundle(for language: String) -> Bundle? {
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guard let lprojURL = url(forResource: language, withExtension: "lproj") else { return nil }
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return Bundle(url: lprojURL)
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}
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/// Preferred app language for translations. Takes the highest priority in translations. The priority list for translations:
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/// - `Bundle.elementLanguage`
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/// - `Locale.preferredLanguages`
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/// - `Bundle.elementFallbackLanguage`
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static var elementLanguage: String? {
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didSet {
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preferredLanguages = calculatePreferredLanguages()
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}
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}
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/// Preferred fallback language for translations. Only used for strings not translated neither to `elementLanguage` nor to one of the user's preferred languages.
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static var elementFallbackLanguage: String? {
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didSet {
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preferredLanguages = calculatePreferredLanguages()
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}
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}
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/// Preferred languages in the priority order.
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private(set) static var preferredLanguages: [String] = calculatePreferredLanguages()
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private static func calculatePreferredLanguages() -> [String] {
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var set = Set<String>()
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return ([Bundle.elementLanguage] +
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Locale.preferredLanguages +
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[Bundle.elementFallbackLanguage])
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.compactMap { $0 }
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.filter { set.insert($0).inserted }
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}
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}
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