NSArray *windows = [UIApplication sharedApplication].windows;
for (UIWindow *window in windows) {
    for (UIView *view in window.subviews) {
        [view removeFromSuperview];
        [window addSubview:view];
    }
}

This snippet shows you how to reload the UIAppearance of an application after changes made on the proxies. This is required because iOS nativaly only load appearance proxies on "applicationDidFinishLaunching".

Refresh UIAppearance after application loaded

update, theme, ios

Objective C