搜索栏从iphone上的搜索按钮扩展

Question

当我单击搜索按钮（如Twitter应用程序中的搜索按钮）时，如何让我的搜索栏在导航栏中展开？现在我的搜索栏只是在导航栏的顶部。这是我打电话的时候，我在导航栏中点击搜索按钮的功能：

func searchbuttonclicked(sender: UIBarButtonItem) { 
    var searchresults = storyboard?.instantiateViewControllerWithIdentifier("searchresults") as searchResultsController 

    var searchcontroller = UISearchController(searchResultsController: searchresults) 
    searchcontroller.hidesNavigationBarDuringPresentation = false 
    searchcontroller.searchResultsUpdater = searchresults 
    searchcontroller.modalTransitionStyle = .CrossDissolve 

    presentViewController(searchcontroller, animated: true, completion: nil) 
} 

Answer 1

从this answer，您可以使用类似：

// declare as property 
var searchBar: UISearchBar! 

// in viewDidLoad 
searchBar = UISearchBar(frame: CGRectMake(0.0, -80.0, 320.0, 44.0)) 
navigationController?.navigationBar.addSubview(searchBar) 

// in action to show 
searchBar.frame = CGRectMake(0.0, 0, 320, 44) 

// in viewWillDisappear 
searchBar.removeFromSuperview() 

然而，searchBar财产上UISearchController是只读，因此您需要继承UISearchController以使其使用导航控制器中的搜索栏，而不是默认显示的搜索栏。