按下时是否可以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));
您可以只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();
}
},
tooltip: 'Play Music',
child: playing?new Icon(Icons.pause):new Icon(Icons.play_arrow));
希望能有所帮助！
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我来说两句