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在类外使用方法和变量

[英]Using methods and variables outside of class

原文 2021-11-14 19:07:35 7 2 flutter

on my flutter app, I'm using some variables and functions like this, outside of class, without dependency injection so I can access them from everywhere.在我的 flutter 应用程序中，我在类之外使用了一些像这样的变量和函数，没有依赖注入，所以我可以从任何地方访问它们。

the question is: Is this bad for performance or has any bad effect on my app?问题是：这对性能不利还是对我的应用程序有任何不利影响？

2 个解决方案

As I know this is not bad for performance because a lot of functions and variables we use in flutter like Colors class is outside the ui state class.据我所知，这对性能来说并不坏，因为我们在 Flutter 中使用的许多函数和变量（如 Colors 类）都在 ui 状态类之外。 And I all Get.* is outside the ui state class>而我都Get.*在ui状态类之外>

It is not a good practice as far as Object Oriented Programming is concerned!就面向对象编程而言，这不是一个好习惯！

Encapulating methods, and fields is necessary to make our code work as it is intended, otherwise, anyone can change anything which could lead to potential problems down the lane.封装方法和字段是使我们的代码按预期工作所必需的，否则，任何人都可以更改任何可能导致潜在问题的东西。

As Andrea Bizzotto says "Making our code easy to use as it is intended and tougher to use otherwise"正如 Andrea Bizzotto 所说：“使我们的代码易于使用，否则难以使用”

在 state class 之外设置变量导致 flutter 应用程序滞后和崩溃 - Setting variables outside state class causing flutter app to lag and crash

Dart / Flutter 在作为参数传递的通用 class 中使用特定方法 - Dart / Flutter using specific methods in a generic class passed as a parameter

访问类之外的类属性 - Accessing to a class property outside of the class

飞镖方法类中的上下文 - context in methods dart class

Riverpod 在 class 中还是在构建方法之外？ - Riverpod in a class or outside of build Method?

flutter 在 class 之外进行 if 语句 - flutter making if statement outside the class

类外的小部件的“状态”是什么 - What is the 'state' of widgets outside of a class

有没有办法从 class 到 class 之外获取值？ - is there a way to get a value from a class to outside the class?

在 flutter 的 class 之外调用 class 的 function - call function of class outside of the class in flutter

如何在小部件方法中将变量作为 state 传递？ - How to pass variables as state in widget methods?

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相关问题 在 state class 之外设置变量导致 flutter 应用程序滞后和崩溃 - Setting variables outside state class causing flutter app to lag and crash Dart / Flutter 在作为参数传递的通用 class 中使用特定方法 - Dart / Flutter using specific methods in a generic class passed as a parameter 访问类之外的类属性 - Accessing to a class property outside of the class 飞镖方法类中的上下文 - context in methods dart class Riverpod 在 class 中还是在构建方法之外？ - Riverpod in a class or outside of build Method? flutter 在 class 之外进行 if 语句 - flutter making if statement outside the class 类外的小部件的“状态”是什么 - What is the 'state' of widgets outside of a class 有没有办法从 class 到 class 之外获取值？ - is there a way to get a value from a class to outside the class? 在 flutter 的 class 之外调用 class 的 function - call function of class outside of the class in flutter 如何在小部件方法中将变量作为 state 传递？ - How to pass variables as state in widget methods?

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