颤动:IconButton onPressed没有被调用

Question

我在ScaffoldappBar中将一个widget列表作为动作,但是当我按下它们时它们没有响应,我floatingButton在场景中也有一个并且它完美地工作.

appBar: new AppBar(
        title: new Text(
            widget.title,
          style: new TextStyle(
            fontFamily: 'vazir'
          ),
        ),
        centerTitle: true,
        actions: <Widget>[
          new IconButton(
            icon: new Icon(Icons.search),
            highlightColor: Colors.pink,
            onPressed: _onSearchButtonPressed(),
          ),
        ],
      ),

void _onSearchButtonPressed() {
    print("search button clicked");
  }

即使我把IconButton放在一个Row或Column小部件中,而不是在其中appBar,它也不再起作用.
答:
感谢siva Kumar,我在调用函数时遇到了错误,我们应该这样调用它:

onPressed: _onSearchButtonPressed, // without parenthesis.

或者这样:

onPressed: (){
    _onSearchButtonPressed();
},

Answer 1

请尝试我的回答它会工作.

    appBar: new AppBar(
    title: new Text(
        widget.title,
      style: new TextStyle(
        fontFamily: 'vazir'
      ),
    ),
    centerTitle: true,
    actions: <Widget>[
      new IconButton(
        icon: new Icon(Icons.search),
        highlightColor: Colors.pink,
        onPressed: (){_onSearchButtonPressed();},
      ),
    ],
  ),

void _onSearchButtonPressed() {
print("search button clicked");
}