如何用动画隐藏/显示UISearchBar的范围栏?

下面介绍如何使“取消”按钮和范围栏仅在编辑时显示。

完整的代码和动画取消按钮(dis)的外观小奖金:

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar {
    searchBar.showsScopeBar = YES;
    [searchBar sizeToFit];
    [searchBar setShowsCancelButton:YES animated:YES];

    return YES;
}

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar {
    searchBar.showsScopeBar = NO;
    [searchBar sizeToFit];
    [searchBar setShowsCancelButton:NO animated:YES];

    return YES;
}

编辑-版本3

public func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {
    searchBar.showsScopeBar = true
    searchBar.sizeToFit()
    searchBar.setShowsCancelButton(true, animated: true)

    return true
}

public func searchBarShouldEndEditing(_ searchBar: UISearchBar) -> Bool {
    searchBar.showsScopeBar = false
    searchBar.sizeToFit()
    searchBar.setShowsCancelButton(false, animated: true)

    return true
}

资料来源: http://www.alexandre-gomes.com/?p=418

对于较新的iOS版本(11-13测试),您不必实现任何委托方法就可以工作。

在ios13中,默认行为是始终显示范围栏,即使搜索未处于活动状态。当搜索处于活动状态时,以前的iOS版本会自动显示和隐藏范围栏。

viewDidLoad()

if #available(iOS 13.0, *) {
    searchController.automaticallyShowsScopeBar = true
}