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FlutterHourFormat.mm
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterHourFormat.h"
6
7 @implementation FlutterHourFormat
8 + (BOOL)isAlwaysUse24HourFormat {
9 // iOS does not report its "24-Hour Time" user setting in the API. Instead, it applies
10 // it automatically to NSDateFormatter when used with [NSLocale currentLocale]. It is
11 // essential that [NSLocale currentLocale] is used. Any custom locale, even the one
12 // that's the same as [NSLocale currentLocale] will ignore the 24-hour option (there
13 // must be some internal field that's not exposed to developers).
14 //
15 // Therefore this option behaves differently across Android and iOS. On Android this
16 // setting is exposed standalone, and can therefore be applied to all locales, whether
17 // the "current system locale" or a custom one. On iOS it only applies to the current
18 // system locale. Widget implementors must take this into account in order to provide
19 // platform-idiomatic behavior in their widgets.
20 NSString* dateFormat = [NSDateFormatter dateFormatFromTemplate:@"j"
21 options:0
22 locale:[NSLocale currentLocale]];
23 return [dateFormat rangeOfString:@"a"].location == NSNotFound;
24 }
25
26 @end
FlutterHourFormat.h
FlutterHourFormat
Definition: FlutterHourFormat.h:11
+[FlutterHourFormat isAlwaysUse24HourFormat]
BOOL isAlwaysUse24HourFormat()
Definition: FlutterHourFormat.mm:8