Fixed mouse focus for touch events on iOS

src/video/uikit/SDL_uikitwindow.m

@@ -160,12 +160,6 @@ SetupWindowData(_THIS, SDL_Window *window, UIWindow *uiwindow, SDL_bool created)
      * heirarchy. */
     [view setSDLWindow:window];
 
-    /* Make this window the current mouse focus for touch input */
-    if (displaydata.uiscreen == [UIScreen mainScreen]) {
-        SDL_SetMouseFocus(window);
-        SDL_SetKeyboardFocus(window);
-    }
-
     return 0;
 }
 
@@ -255,6 +249,14 @@ UIKit_ShowWindow(_THIS, SDL_Window * window)
     @autoreleasepool {
         SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
         [data.uiwindow makeKeyAndVisible];
+
+        /* Make this window the current mouse focus for touch input */
+        SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
+        SDL_DisplayData *displaydata = (__bridge SDL_DisplayData *) display->driverdata;
+        if (displaydata.uiscreen == [UIScreen mainScreen]) {
+            SDL_SetMouseFocus(window);
+            SDL_SetKeyboardFocus(window);
+        }
     }
 }