SwitchButton | 类似ios效果的滑动按钮 , 支持自定义背景，动画效果，渐变效果

You can try this. Thank you.

Your logic is a bit incorrect.

You do :

you forgot “= nativeToForeign” in updateTranslationDirection

useState hook is linked with its related setState hook. This hook is called asynchronously. It means you can't get the changes immediately after this hook is called. There may be many many other functions being called behind the curtain. Henceforth, you are not immediately getting the updated value. in order to check its changes properly you may use the useEffect hook that will be trigger whenever the trigger parameter is updated.

Try this

I think you just need 'value' to accept a prop passed into it on the switch button. Then wherever you use switch button just pass a boolean value into it from state e.g.

As for setting state 'globally' so this.state.switchEnabled can be updated from various places / accessible all over the app you need to look into state management tools like Redux (or I hear 'React Hooks' is now a thing and preferred....)

As @emkarachchi in the comment pointed out, you need to us setToggleState(currentState) at the end of your useEffect call. The state uses currentState only at the first loading of your screen.

For setPersistedSwitchState better straight use your togglestate variable, so you do not need the ifs, so setPersistedSwitchState(!toggleState).

The problem seems to be that the input elements related to the number of passengers and the number of pieces of luggage are picking up the default width. Although the spec seems to say this should be 20 characters it seems a bit different between browsers.

I think your safest bet is not to rely on what the browser sets as default width but set it yourself. You could do that either with say setting width: 2em for the input elements or by giving them each a size attribute which will make them wide enough for the number of characters you specify. So size="1" would be enough for the passengers and size="2" would be enough for the luggage.

Incidentally both FF and Chrome complained about the calcs in your CSS. They need spaces around the minus sign. I don't think this made a material difference to the problem you stated in the question but you may like to check them in case they disturb something else. For example in .inputBox use width:calc(100% - 10px);

It is because you have used askopenfile(...) which will open the selected file in read mode and return the file handle.

When you switch to song2, song1 is closed. When you want to switch back to song1 again, mixer.music.load(song1) will fail with exception because the file is already closed.

Use askopenfilename() instead of askopenfile().

Note 1: mixer.music.get_pos() returns the elapsed time relative to start, not the beginning.

Note 2: your switching logic will not work properly after switching two times.