UISearchController 不触发委托方法和搜索栏委托方法答案

【问题标题】：UISearchController does not trigger delegate methods and search bar delegate methodsUISearchController 不触发委托方法和搜索栏委托方法
【发布时间】：2015-04-01 15:33:58
【问题描述】：

所以我有 UISearchController，它显示栏，我可以输入文本但它不会触发委托方法。这是我的代码：

@IBAction func searchTapped(AnyObject) {

    NSLog("search...")

    let cancelButton = UIBarButtonItem(image: UIImage(named: "delete_sign-50"), landscapeImagePhone: nil, style: .Plain, target: self, action: "cancelTapped:")

    var searchController = UISearchController(searchResultsController: nil)
    searchController.dimsBackgroundDuringPresentation = false
    searchController.searchBar.placeholder = "enter the text to search"
    searchController.searchResultsUpdater = self;
    searchController.hidesNavigationBarDuringPresentation = false
    searchController.delegate = self
    searchController.searchBar.delegate = self

    self.definesPresentationContext = true;


    UIView.animateWithDuration(0.2, animations: { () -> Void in

        self.navigationItem.rightBarButtonItems = nil
        self.navigationItem.rightBarButtonItems = [cancelButton]
        self.navigationItem.titleView = searchController.searchBar
        searchController.searchBar.sizeToFit()
        self.toolbar.hidden = false
        self.tableView?.hidden = false
    })

    //add first responser to search bar
    searchController.searchBar.becomeFirstResponder()

}

func updateSearchResultsForSearchController(searchController: UISearchController) {

    NSLog("1 %@", searchController.searchBar.text);

}

func searchBar(searchBar: UISearchBar, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    NSLog("2 %@", text)
    return true
}

文本更改时不会调用这些方法。

不仅如此，我还尝试将 searchController 作为变量添加到我的控制器中，在这种情况下，它工作得非常糟糕——当我点击搜索栏时，它会移出屏幕。

【问题讨论】：

你确认 UISearchController 委托了吗？

标签： ios swift ios8

【解决方案1】：

searchController.active = YES;

这有帮助，不知道为什么在任何地方都没有提到它。

【讨论】：

【解决方案2】：

IOS 9

    -(void )viewDidLoad
 _searchController = [[UISearchController alloc] initWithSearchResultsController:self];
    self.navigationItem.titleView  = _searchController.searchBar;
    self.definesPresentationContext = YES;
    _searchController.delegate = self;
    _searchController.searchBar.delegate = self;
    _searchController.searchBar.placeholder = NSLocalizedString(@"SEARCHTITLE", nil);
    [_searchController.searchBar setShowsCancelButton: YES animated: NO];

【讨论】：