也就是说，Iterable<E>.firstWhere必须返回E。它不能返回E?。如果E不可为空，则.firstWhere不能返回...
百度文库 期刊文献 图书flutter firstwhere orelse non safe 返回null 报错flutter firstwhere orelse non safe 返回null 报错 先扑动,否则不安全返回无效的报错©2022 Baidu |由 百度智能云 提供计算服务 | 使用百度前必读 | 文库协议 | 网站地图 | 百度营销 ...
1. 解释 firstWhereOrNull 函数在Flutter(或Dart)中的作用 firstWhereOrNull 是Dart 集合(Iterable)的一个扩展函数,用于在集合中查找第一个满足指定条件的元素。如果找到符合条件的元素,就返回该元素;如果集合中没有元素满足条件,就返回 null。这与 firstWhere 函数类似,但 firstWhere 在找不到符合条件的元素时会...
`test/integration.shard/hot_reload_with_asset_test.dart: hot restart does not need to sync assets on the first reload` is very flaky #153563 closed Dec 20, 2024 Flutter 3.27.0: Swift package manager could not resolve package dependencies #160656 closed Dec 20, 2024 Persistent Bottom...
I've been trying to install it for two days now and I haven't been able to. What remains for me is to consult you and I appreciate all your collaboration. I attach a reference screenshot so you can see where the installation process left off and did not continue. ...
* If no element satisfies [test], the result of invoking the [orElse] * function is returned. * If [orElse] is omitted, it defaults to throwing a [StateError]. */EfirstWhere(booltest(E element),{EorElse()}){for(E elementinthis){if(test(element))returnelement;}if(orElse!=null)...
findNext({required bool forward}): Highlights and scrolls to the next match found by findAllAsync(). Notifies onFindResultReceived listener. getCertificate: Gets the SSL certificate for the main top-level page or null if there is no certificate (the site is not secure). getContentHeight: Ge...
A Flutter plugin that allows you to add an inline webview or open an in-app browser window. Requirements Dart sdk: ">=2.0.0-dev.68.0.0.0" Flutter: ">=1.9.1+hotfix.5 <2.0.0" Android:minSdkVersion 17 iOS:--ios-language swift, Xcode version>= 11 ...
Next, we need to create the platform channel like what we did on the native side in theMainActivity. First we’ll define a global constant. It’s not ideal, but for our sample this is fine. Copy const platform = const MethodChannel('duosdk.microsoft.dev'); ...
关于Get GetX 是一个超轻且强大的 Flutter 解决方案。它快速实用地结合了高性能状态管理、智能依赖注入和路由管理。GetX 有 3 个基本原则。这意味着库中所有资源的首要任务是: 生产力、绩效和组织。 性能: GetX …