获取expo-camera ref以开始在功能组件中录制视频

Question

我正在试着让世博会的摄像机来录制视频。但是，我得到了一个错误：

[TypeError: camera.recordAsync is not a function. (In ‘camera.recordAsync()’, ‘camera.recordAsync’ is undefined)]

这是实现：

<Camera 
                style={{ flex: 1 }} 
                type={type}
                ref={camera}
            >
                <View
                style={{
                    flex: 1,
                    backgroundColor: 'transparent',
                    flexDirection: 'row',
                }}>
                <View style={{ alignSelf: 'flex-end', alignItems: 'center', padding: 20, flexDirection: 'row', justifyContent: 'space-between', width: '100%'}}>
                    <MaterialIcons name="video-library" onPress={pickVideo} color={"#eee"} size={45}/>     
                    <RecordingIcon />    
                    <Ionicons name="ios-reverse-camera" onPress={setCameraType} color={"#eee"} size={45}/>                     
                </View>
                </View>
            </Camera>

重要的一行是RecordingIcon。

function RecordingIcon (){
        if(recording){
            stopRecording()
            return (
                <MaterialIcons name="fiber-manual-record" onPress={() => setRecording(false)} color={"#FF0000"} size={60}/>  
            )
        } else {
            record()
            return (
                <MaterialIcons name="fiber-manual-record" onPress={() => setRecording(true)} color={"#eee"} size={60}/>  
            )
        }
    }

每次我点击录制图标时，就会调用这两个函数中的一个。

async function record(){
        console.log("record", camera); 
        if(camera){
            let recording = await camera.recordAsync(); 
        }
    }

    async function stopRecording(){
        console.log("stop recording", camera); 
        if(camera){
            let stopRecording = await camera.stopRecording(); 
        }
    }

async function record(){
        console.log("record", camera); 
        if(camera){
            let recording = await camera.recordAsync(); 
        }
    }

    async function stopRecording(){
        console.log("stop recording", camera); 
        if(camera){
            let stopRecording = await camera.stopRecording(); 
        }
    }

这就是我初始化相机引用的方式。

let camera = useRef(null);

Answer 1

使用camera.current

async function record(){
    console.log("record", camera); 
    if(camera){
        let recording = await camera.current.recordAsync(); 
    }
}
async function stopRecording(){
   console.log("stop recording", camera); 
   if(camera){
       let stopRecording = await camera.current.stopRecording(); 
   }
}