signalapp/Signal-iOS
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Add a helper to see if a given emoji is available on the current iOS version

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This commit is contained in:
Nora Trapp 2020-05-27 23:51:31 -07:00
parent 0805ff8ca9
commit 9593f37373
2 changed files with 48 additions and 0 deletions
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4
Signal.xcodeproj/project.pbxproj
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@ -620,6 +620,7 @@
880BFFEA234590FA00F6FAB1 /* ConversationSplitViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 880BFFE82345907600F6FAB1 /* ConversationSplitViewController.swift */; };
880C0FF7233D3F7C00386FB8 /* playPauseButton.json in Resources */ = {isa = PBXBuildFile; fileRef = 880C0FF6233D3F7C00386FB8 /* playPauseButton.json */; };
880D9025247F8841003D2B14 /* Emoji+Name.swift in Sources */ = {isa = PBXBuildFile; fileRef = 880D9024247F8841003D2B14 /* Emoji+Name.swift */; };
880D9027247F90CC003D2B14 /* Emoji+Available.swift in Sources */ = {isa = PBXBuildFile; fileRef = 880D9026247F90CC003D2B14 /* Emoji+Available.swift */; };
8810223722DF9C2300A7C44F /* OnboardingPinAttemptsExhaustedViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8810223622DF9C2300A7C44F /* OnboardingPinAttemptsExhaustedViewController.swift */; };
8811CF842295D8DA00FF6549 /* VolumeButtons.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8811CF832295D8DA00FF6549 /* VolumeButtons.swift */; };
881218F0238CA51600E6F271 /* MessageReactionPicker.swift in Sources */ = {isa = PBXBuildFile; fileRef = 881218EF238CA51600E6F271 /* MessageReactionPicker.swift */; };
@ -1576,6 +1577,7 @@
880BFFE82345907600F6FAB1 /* ConversationSplitViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConversationSplitViewController.swift; sourceTree = "<group>"; };
880C0FF6233D3F7C00386FB8 /* playPauseButton.json */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.json; path = playPauseButton.json; sourceTree = "<group>"; };
880D9024247F8841003D2B14 /* Emoji+Name.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Emoji+Name.swift"; sourceTree = "<group>"; };
880D9026247F90CC003D2B14 /* Emoji+Available.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Emoji+Available.swift"; sourceTree = "<group>"; };
880FC0A023BFDADC00A2A900 /* sk */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = sk; path = translations/sk.lproj/Localizable.strings; sourceTree = "<group>"; };
8810223622DF9C2300A7C44F /* OnboardingPinAttemptsExhaustedViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OnboardingPinAttemptsExhaustedViewController.swift; sourceTree = "<group>"; };
8811CF832295D8DA00FF6549 /* VolumeButtons.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VolumeButtons.swift; sourceTree = "<group>"; };
@ -3114,6 +3116,7 @@
887889B0247F2E72001B5FCF /* Emoji.swift */,
887889AF247F2E72001B5FCF /* Emoji+Category.swift */,
880D9024247F8841003D2B14 /* Emoji+Name.swift */,
880D9026247F90CC003D2B14 /* Emoji+Available.swift */,
);
path = Emoji;
sourceTree = "<group>";
@ -4744,6 +4747,7 @@
340CCB6A23032762005243B3 /* YDBLegacyMigration.m in Sources */,
88A4CC09246CB0960082211F /* OnboardingTransferChoiceViewController.swift in Sources */,
3496955D219B605E00DCFE74 /* PhotoCollectionPickerController.swift in Sources */,
880D9027247F90CC003D2B14 /* Emoji+Available.swift in Sources */,
8835DDFD230CEE8900DC6B66 /* RecipientPickerDelegate.swift in Sources */,
34E6003A24251AD50026AD4B /* GroupViewUtils.swift in Sources */,
340E9AC4236095CD00FA362C /* AttachmentMultisend.swift in Sources */,

44
Signal/src/util/Emoji/Emoji+Available.swift Normal file
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@ -0,0 +1,44 @@
//
// Copyright (c) 2020 Open Whisper Systems. All rights reserved.
//
extension Emoji {
static var availableCache = [Emoji: Bool]()
/// Indicates whether the given emoji is available on this iOS
/// version. We cache the availability in memory.
var available: Bool {
guard let available = Emoji.availableCache[self] else {
let available = rawValue.isUnicodeStringAvailable
Emoji.availableCache[self] = available
return available
}
return available
}
}
private extension String {
/// A known undefined unicode character for comparison
private static let unknownUnicodeStringPng = "\u{1fff}".unicodeStringPngRepresentation
// Based on https://stackoverflow.com/a/41393387
// Check if an emoji is available on the current iOS version
// by verifying its image is different than the "unknwon"
// reference image
var isUnicodeStringAvailable: Bool {
return String.unknownUnicodeStringPng != unicodeStringPngRepresentation
}
var unicodeStringPngRepresentation: Data? {
let attributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 8)]
let size = (self as NSString).size(withAttributes: attributes)
UIGraphicsBeginImageContext(size)
defer { UIGraphicsEndImageContext() }
(self as NSString).draw(at: CGPoint(x: 0, y: 0), withAttributes: attributes)
guard let unicodeImage = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
return unicodeImage.pngData()
}
}