世博会相机 takePictureAsync ImageManipulator

Posted 2023-02-19

【中文标题】世博会相机 takePictureAsync ImageManipulator

【英文标题】：expo camera takePictureAsync ImageManipulator

【发布时间】：2018-10-19 20:06:31

【问题描述】：

我有一个这样的sn-p

takePicture = async function() 
        if (this.camera) 
            this.camera
                .takePictureAsync()
                .then(data => 
                    FileSystem.moveAsync(
                        from: data.uri,
                        to: `$FileSystem.documentDirectoryphotos/Photo_$
                            this.state.photoId
                        .jpg`
                    ).then(() => 
                        this.setState(
                            photoId: this.state.photoId + 1
                        );
                        Vibration.vibrate();
                    );
                );
        
    ;

现在我的问题是我不知道如何将 ImageManipulator 插入此函数。我的目的是在 takePictureAsync() 之后，将照片调整为 108x192，然后将这张照片移动到 documentDirectory。非常感谢

【参考方案1】：

我找到了解决办法，这里是代码

takePicture = async function() 
        if (this.camera) 
            let photo = await this.camera.takePictureAsync();
            let resizedPhoto = await ImageManipulator.manipulate(
                photo.uri,
                [ resize:  width: 108, height: 192  ],
                 compress: 0, format: "jpg", base64: false 
            );
            FileSystem.moveAsync(
                from: resizedPhoto.uri,
                to: `$FileSystem.documentDirectoryphotos/Photo_$
                    this.state.photoId
                .jpg`
            );
            this.setState( photoId: this.state.photoId + 1 );
            Vibration.vibrate();            
        
    ;

【讨论】：

如果我错了，请纠正我，但这会导致错误，photo.uri 可能未定义。

拍照后有照片对象返回，所以uri不能为undefined