插座连接和动作连接有什么区别? [英] What is the difference between outlet connection and action connection?

问题描述

当我尝试在xib和文件所有者之间创建连接时，有几种类型可供选择:

When I try to create a connection between xib and the file's owner, there are several types to choose from:

• 插座连接
• 动作连接
• 插座收集连接

所有这些之间有什么区别?

What are the differences between all of those?

推荐答案

Outlet和Action是ViewController与View交互的方式(或连接/中介).尽管在iOS的初期，它们看起来可能相似，但是它们的目的不同:

Outlet and Action are ways (or connection/intermediary) by which a ViewController will interact with its View. Though both of them may look similar during initial days of iOS acquaintance but they serve different purpose:

插座:ViewController talks to View by using Outlet. View中的任何对象(UILabel，UIButton，UIImage，UIView等)都可以具有到ViewController的插座连接.插座在ViewController中用作@property，这意味着:
-您可以通过使用插座来设置对象的某些内容(例如更新UILabel的文本，设置UIView的背景图像等).
-您可以从对象中获取某些信息(例如UIStepper的当前值，NSAttributedString的当前字体大小等)

Outlet: ViewController talks to View by using Outlet. Any object (UILabel, UIButton, UIImage, UIView etc) in View can have an Outlet connection to ViewController. Outlet is used as @property in ViewController which means that:
- you can set something (like Update UILabel's text, Set background image of a UIView etc.) of an object by using outlet.
- you can get something from an object (like current value of UIStepper, current font size of a NSAttributedString etc.)

操作:View pass on messages about view to ViewController by using Action(或者在技术术语上，ViewController将其自身设置为Target对于View中的任何Action).动作是ViewController中的Method(不同于Outlet在ViewController中是@property).每当对象发生任何事情(任何Event)(例如，点击UIbutton)时，Action就会将消息传递给ViewController.收到消息后，动作(或动作方法)可以执行某些操作.
注意:只能通过UIControl的子对象设置操作；表示您无法为UILabel，UIView等设置操作.

Action: View pass on messages about view to ViewController by using Action (Or in technical terms ViewController set itself as Target for any Action in View). Action is a Method in ViewController (unlike Outlet which is @property in ViewController). Whenever something (any Event) happens to an object (like UIbutton is tapped) then Action pass on message to ViewController. Action (or Action method) can do something after receiving the message.
Note: Action can be set only by UIControl's child object; means you can't set Action for UILabel, UIView etc.

在哪里\何时使用插座或操作:
在开始接触iOS的最初几天，将Action和Outlet及其用法混淆不清是完全正常的. Outlet和Action几乎都可以完成一些小事情(例如获取按钮的文本/标题)，但除此之外，它们有很大的不同.在使用其中一种方法时，请牢记以上几点.

Where\When to use Outlet or Action:
During initial days of iOS acquaintance its perfectly normal to get confused between Action and Outlet and their usages. There are few small things (like getting text/title of a button) that can be done by both Outlet and Action but otherwise they are very different. Keep above points in mind while using one or other.

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