The special attribute in photochooser is showcame.

The special attribute in photochooser is the showcamera attribute first. The showcamera attribute is a boolean type. When it is set to true, a photo button will appear in the picture selected, users can also use the camera as the source of the image, as shown in the following figure (you can see that there are more photo buttons in the application bar)

 

Next is the pixelheight and pixelwidth attributes. These two attributes allow users to crop original images. For example, if an application wants users to set a large head sticker, the size of the Large Head sticker only needs 100*10, A large image is useless at this time, so you can set these two attributes. After setting, the cropped box will appear after the user selects the photo. The box will be adjusted according to the configured length/width ratio, for example, in the lower-left figure, the author sets the ratio of, and the right figure shows the effect after cropping.