How to implement 3D-Touch Peek-and-select?

Question

Phone, Reminders, and Maps use a different 3D-Touch Peek UI allowing to select an action in one go. For instance, force-press on a reminder and select \"Remind me on a day\"

Answer 1

Those are UIPreviewActionItem.

After overriding previewingContext:viewControllerForLocation: you can also override - (NSArray> *)previewActionItems and that will allow you to specify your quick actions.

Here's a snippet that will help you out: (related tutorial)

- (NSArray> *)previewActionItems
{
    UIPreviewAction *action1 = [UIPreviewAction actionWithTitle:@"Action 1" style:UIPreviewActionStyleDefault handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"Action 1 triggered");
    }];

    UIPreviewAction *action2 = [UIPreviewAction actionWithTitle:@"Destructive Action" style:UIPreviewActionStyleDestructive handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"Destructive Action triggered");
    }];

    UIPreviewAction *action3 = [UIPreviewAction actionWithTitle:@"Selected Action" style:UIPreviewActionStyleSelected handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"Selected Action triggered");
    }];

    return @[action1, action2, action3];
}

Apple Docs:

This property is for use with a preview (peek) view controller which you present in your implementation of the previewingContext:viewControllerForLocation: delegate method..

Implement this method to provide quick actions for such a preview. When the user swipes upward on the preview, the system presents these quick action items in a sheet below the preview.

The default implementation of this method returns an empty array.