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09680f71df
Summary: In modern Objective-C you should use the `instancetype` keyword for methods which return an instance of the class they are called on. See Apple's [Adopting Modern Objective-C](https://developer.apple.com/library/content/releasenotes/ObjectiveC/ModernizationObjC/AdoptingModernObjective-C/AdoptingModernObjective-C.html) guide. Because `sharedInstance` was returning an object of type `id`, the returned value needed to be cast before it could be used in Swift. I also changed the implementation of `sharedInstance` to use Grand Central Dispatch, which is the generally accepted best way of creating a singleton in Objective-C. I verified my changes with the "RTLExample" app in RNTester. | LTR | RTL | |---|---| |<img width="300" src="https://user-images.githubusercontent.com/1413388/31155210-6454b4d6-a87a-11e7-9dd7-9a52f3924737.png">|<img width="300" src="https://user-images.githubusercontent.com/1413388/31155233-8702aff6-a87a-11e7-8028-51cf2b3eb0c4.png">| Closes https://github.com/facebook/react-native/pull/16196 Differential Revision: D5971898 Pulled By: shergin fbshipit-source-id: dfa375c89248adfc9fd885cacc6a6d4cbfea6e90
97 lines
2.6 KiB
Objective-C
97 lines
2.6 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <Foundation/Foundation.h>
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#import "RCTI18nUtil.h"
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@implementation RCTI18nUtil
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+ (instancetype)sharedInstance
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{
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static RCTI18nUtil *sharedInstance;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sharedInstance = [self new];
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});
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return sharedInstance;
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}
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/**
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* Check if the app is currently running on an RTL locale.
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* This only happens when the app:
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* - is forcing RTL layout, regardless of the active language (for development purpose)
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* - allows RTL layout when using RTL locale
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*/
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- (BOOL)isRTL
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{
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if ([self isRTLForced]) {
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return YES;
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}
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if ([self isRTLAllowed] && [self isApplicationPreferredLanguageRTL]) {
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return YES;
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}
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return NO;
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}
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/**
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* Should be used very early during app start up
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* Before the bridge is initialized
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* @return whether the app allows RTL layout, default is true
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*/
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- (BOOL)isRTLAllowed
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{
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NSNumber *value = [[NSUserDefaults standardUserDefaults] objectForKey:@"RCTI18nUtil_allowRTL"];
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if (value == nil) {
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return YES;
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}
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return [value boolValue];
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}
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- (void)allowRTL:(BOOL)rtlStatus
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{
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[[NSUserDefaults standardUserDefaults] setBool:rtlStatus forKey:@"RCTI18nUtil_allowRTL"];
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[[NSUserDefaults standardUserDefaults] synchronize];
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}
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/**
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* Could be used to test RTL layout with English
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* Used for development and testing purpose
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*/
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- (BOOL)isRTLForced
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{
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BOOL rtlStatus = [[NSUserDefaults standardUserDefaults]
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boolForKey:@"RCTI18nUtil_forceRTL"];
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return rtlStatus;
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}
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- (void)forceRTL:(BOOL)rtlStatus
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{
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[[NSUserDefaults standardUserDefaults] setBool:rtlStatus forKey:@"RCTI18nUtil_forceRTL"];
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[[NSUserDefaults standardUserDefaults] synchronize];
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}
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// Check if the current device language is RTL
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- (BOOL)isDevicePreferredLanguageRTL
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{
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NSLocaleLanguageDirection direction = [NSLocale characterDirectionForLanguage:[[NSLocale preferredLanguages] objectAtIndex:0]];
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return direction == NSLocaleLanguageDirectionRightToLeft;
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}
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// Check if the current application language is RTL
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- (BOOL)isApplicationPreferredLanguageRTL
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{
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NSString *preferredAppLanguage = [[[NSBundle mainBundle] preferredLocalizations] objectAtIndex:0];
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NSLocaleLanguageDirection direction = [NSLocale characterDirectionForLanguage:preferredAppLanguage];
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return direction == NSLocaleLanguageDirectionRightToLeft;
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}
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@end
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