iOS: How to run a function after Device has Rotated (Swift)

Question

I have one UIView which is not using Auto-Layout and some components are displayed based on their percent of X and Y co-ordinates from the main view.

Previously I wo

Answer 1

The viewWillTransitionToSize delegate method gets called with a UIViewControllerTransitionCoordinator conforming object. A method that protocol declares is animateAlongsideTransition(_:animation, completion:). You can use that to have code execute after the transition is complete.

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    coordinator.animate(alongsideTransition: nil) { _ in
        // Your code here
    }
}

Answer 2

Above answer https://stackoverflow.com/a/26944087/6583492 is absolutely right, thanks to Acey and Moonwalkr. But for swift 3.0 it will looks like the following

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    coordinator.animate(alongsideTransition: nil) { _ in
        // Your code here
    }
}

Answer 3

Although not asked for here Objective C version:

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {

    // change any properties on your views

} completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
    UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
    if( UIDeviceOrientationIsPortrait(orientation) ) {
        NSLog(@"portrait");
    } else {
        NSLog(@"landscape");
    }  
}];
}