有时我们需要，控件不接收信号，可以使用 blockSignals
当设置为true时，QObject对象[子类]不会发出信号
1、函数原型
1 bool QObject::blockSignals(bool block) 2 If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). If block is false, no such blocking will occur. 3 The return value is the previous value of signalsBlocked(). 4 Note that the destroyed() signal will be emitted even if the signals for this object have been blocked. 5 Signals emitted while being blocked are not buffered. 6 See also signalsBlocked() and QSignalBlocker.2.使用说明
例如：
QCboBox动态添加item的时候，它会发出xxxChanged信号，但是初始情况下我们不希望其发出，待初始化完成后再发出。
则可以：
先设置blockSignals(true)；//阻塞信号
添加item；
设置blockSignals(false);//取消信号阻塞
example:
1 m_ControlsboBox>blockSignals(true); 2 m_ControlsboBox>addItems( AngleList()); 3 m_ControlsboBox>setCurrentIndex(0);//45度 4 m_ControlsboBox>blockSignals(false);上一篇：数控系统中的模态指令
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