dart – 按下时更改浮动按钮图标的方法

概述按下时有没有办法更改浮动按钮的图标？ 码： var musicButton = new FloatingActionButton( onPressed: (){ if(playerState == PlayerState.playing) { //setState(() => child = new Icon(Icons.pause)); set 按下时有没有办法更改浮动按钮的图标？
码：

var musicbutton = new floatingActionbutton(    onpressed: (){      if(playerState == PlayerState.playing) {        //setState(() => child = new Icon(Icons.pause));        setState((){          child: new Icon(Icons.play_arrow);        });        pause();      } else if (playerState == PlayerState.paused){        setState((){          child: new Icon(Icons.pause);        });        play();      }    },tooltip: 'Play Music',child: new Icon(Icons.pause));

解决方法 您可以使用状态变量在图标之间切换.

例：

bool playing = false;

然后

var musicbutton = new floatingActionbutton(    onpressed: (){      if(playerState == PlayerState.playing) {        setState((){          playing = false;        });        pause();      } else if (playerState == PlayerState.paused){        setState((){          playing = true;        });        play();      }    },child: playing?new Icon(Icons.pause):new Icon(Icons.play_arrow));

希望有所帮助！

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