# SDL_SetiOSAnimationCallback Use this function to set the animation callback on Apple iOS. ## Header File Defined in [<SDL3/SDL_system.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_system.h) ## Syntax ```c bool SDL_SetiOSAnimationCallback(SDL_Window *window, int interval, SDL_iOSAnimationCallback callback, void *callbackParam); ``` ## Function Parameters | | | | | ---------------------------------------------------- | ----------------- | ------------------------------------------------------------- | | [SDL_Window](SDL_Window) * | **window** | the window for which the animation callback should be set. | | int | **interval** | the number of frames after which **callback** will be called. | | [SDL_iOSAnimationCallback](SDL_iOSAnimationCallback) | **callback** | the function to call for every frame. | | void * | **callbackParam** | a pointer that is passed to `callback`. | ## Return Value (bool) Returns true on success or false on failure; call [SDL_GetError](SDL_GetError)() for more information. ## Remarks The function prototype for `callback` is: ```c void callback(void *callbackParam); ``` Where its parameter, `callbackParam`, is what was passed as `callbackParam` to [SDL_SetiOSAnimationCallback](SDL_SetiOSAnimationCallback)(). This function is only available on Apple iOS. For more information see: https://wiki.libsdl.org/SDL3/README-ios Note that if you use the "main callbacks" instead of a standard C `main` function, you don't have to use this API, as SDL will manage this for you. Details on main callbacks are here: https://wiki.libsdl.org/SDL3/README-main-functions ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_SetiOSEventPump](SDL_SetiOSEventPump) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategorySystem](CategorySystem)