flutter ios 13 dark mode

前言

ios 13 开启 dark model,flutter页面status bar文字一直是白色

flutter issues

SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle.dark);

设置dark style 并没有用

SystemChrome

static void setSystemUIOverlayStyle(SystemUiOverlayStyle style) {
    assert(style != null);
    if (_pendingStyle != null) {
      // The microtask has already been queued; just update the pending value.
      _pendingStyle = style;
      return;
    }
    if (style == _latestStyle) {
      // Trivial success: no microtask has been queued and the given style is
      // already in effect, so no need to queue a microtask.
      return;
    }
    _pendingStyle = style;
    scheduleMicrotask(() {
      assert(_pendingStyle != null);
      if (_pendingStyle != _latestStyle) {
        SystemChannels.platform.invokeMethod<void>(
          'SystemChrome.setSystemUIOverlayStyle',
          _pendingStyle._toMap(),
        );
        _latestStyle = _pendingStyle;
      }
      _pendingStyle = null;
    });
  }

FlutterPlatformPlugin

- (void)setSystemChromeSystemUIOverlayStyle:(NSDictionary*)message {
  NSString* style = message[@"statusBarBrightness"];
  if (style == (id)[NSNull null])
    return;

  UIStatusBarStyle statusBarStyle;
  if ([style isEqualToString:@"Brightness.dark"])
    statusBarStyle = UIStatusBarStyleLightContent;
  else if ([style isEqualToString:@"Brightness.light"])
    statusBarStyle = UIStatusBarStyleDefault;
  else
    return;

  NSNumber* infoValue = [[NSBundle mainBundle]
      objectForInfoDictionaryKey:@"UIViewControllerBasedStatusBarAppearance"];
  Boolean delegateToViewController = (infoValue == nil || [infoValue boolValue]);

  if (delegateToViewController) {
    // This notification is respected by the iOS embedder
    [[NSNotificationCenter defaultCenter]
        postNotificationName:@(kOverlayStyleUpdateNotificationName)
                      object:nil
                    userInfo:@{@(kOverlayStyleUpdateNotificationKey) : @(statusBarStyle)}];
  } else {
    // Note: -[UIApplication setStatusBarStyle] is deprecated in iOS9
    // in favor of delegating to the view controller
    [[UIApplication sharedApplication] setStatusBarStyle:statusBarStyle];
  }
}

engine 源码中 可以看到 没有 UIStatusBarStyleDarkContent

尝试 去掉 info.plist 中的 UIViewControllerBasedStatusBarAppearance

然后 监听 通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appStatusBar:) name:@"io.flutter.plugin.platform.SystemChromeOverlayNotificationName" object:nil];

- (void)appStatusBar:(id)notification {
    if (@available(iOS 13.0, *)) {
        [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDarkContent;
    }
}