[Vuejs]-Detection of vue components finish rendering

If you are talking about a few component loading simultaneously then the best way would be using vuex.

You can store to vuex 2 values: isLoading and countLoadingComponents.

You can increment countLoadingComponents at beginning of created() method of each component and decrement countLoadingComponents when API call within that component is finished.

Create watcher for countLoadingComponents state in the main component. If countLoadingComponents equal 0, then change state of isLoading to false.