问题描述
关于 QApplication 的 exec 函数，我了解以下内容:
I have understood the following regarding QApplication's exec function:
QApplication exec 启动主事件循环.它启动 GUI.它处理信号并在接收到它们时调用适当的时隙.它一直等到 exit 被调用并返回在 exit 中设置的值.
QApplication exec starts the main event loop. It launches the GUI. It processes the signals and calls appropriate slots on receiving them. It waits until exit is called and returns the value which was set in exit.
现在，当我们说事件循环时，是否意味着在Qt内部代码中运行了一些while循环，并且在那个while循环中写了处理信号和槽的方法?
Now, when we say event loop, does it mean that there is some while loop running in the internal code of Qt, and in that while loop the method of handling signals and slots is written?
推荐答案
现在，当我们说事件循环时，是否意味着有一些while在 Qt 的内部代码中运行的循环，在那个 while 循环中信号槽的处理方法有写吗?
Now, when we say event loop, does it mean that there is some while loop running in the internal code of Qt, and in that while loop the method of handling signals and slots is written?
从某种意义上说，是的.如今，大多数软件都坐着等待事件——用户输入、网络流量、计时器事件、传感器等——并做出相应的响应.
In a sense, yes. Most software these days sits and waits for events -- user input, network traffic, timer events, sensors, etc. -- and responds accordingly.
这不是 Qt 特有的.这是一种常见的设计模式，从 Windows 到 Android 再到 Arduino，随处可见.
This is not specific to Qt. It's a common design pattern you'll find everywhere from Windows to Android to Arduino.
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