UISearchBar - 当点击取消按钮时，如何防止关闭 scopeBar？

Question

I want my UISearchBar 's scopeButtons to remain visible at all times, but even though I've set searchBar.showsScopeBar = YES' , the buttons are still dismissed with an animation if I begin a search and then cancel it.

Is there any way I can prevent the scopeBar being animated out when the search is cancelled?

Answer 1

Since the scope bar is only meant to be used while the UISearchController is active, I approached the problem differently.

I make the UISearchController active immediately.

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    // Immediately activating the searchController keeps scope bar permanently visible
    searchController.isActive = true
    // Tapping the cancel button triggers this method, which quickly toggles the scope bar
    // But the cancel button isn't needed anyway, so hiding it solves the problem
    searchController.searchBar.showsCancelButton = false
}

But now that the UISearchController is always active, by default the UINavigationBar is hidden, which is probably not what you want. To fix that, I prevent it from being hidden in viewDidLoad

searchController.hidesNavigationBarDuringPresentation = false

This approach means that I don't need to use showsScopeBar at all, because it is always visible while the UISearchController is active.

Answer 2

In case anyone is interested, the following delegate method does it.

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar
{
    [searchBar setShowsScopeBar:YES];
    return YES;
}