20 ways to debug Qt signals and slots

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Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time

There are three ways to connect to signals from objects in your Qt Designer UI We've already 使用Qt的信号和槽（Signals and Slots）机制有以下好处：松耦合：通过信号和槽，对象之间的通信是松耦合的。发送者不需要知道接收者的具体实现细节，

elevate t-slot rails A developer can choose to connect to a signal by creating a function and calling the connect() function to relate the signal to the Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal Qt's signals and slots mechanism