dart - 按下时更改 float 按钮图标的方法

按下时有什么方法可以更改 float 按钮图标吗？
代码:

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));

最佳答案

您可以仅使用状态变量在图标之间切换。

例子:

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));

希望有所帮助!

关于dart - 按下时更改 float 按钮图标的方法，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/48677140/