以编程方式创建UISearchDisplayController [英] Creating a UISearchDisplayController programmatically

问题描述

我正在尝试以编程方式创建 UISearchDisplayController 。我有一个应该设置我的搜索控制器的方法，但是当我调用它时，没有任何反应。

I'm trying to create a UISearchDisplayController programmatically. I have a method which should set up my search controller, but when I call it, nothing happens.

这是我的 -setupSearch 方法：

- (void)setupSearch {
    UISearchBar *myBar;
    UISearchDisplayController *myCon;

    myBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
    [myBar sizeToFit];

    myCon = [[UISearchDisplayController alloc]
             initWithSearchBar:myBar contentsController:self];
    [myBar release];

    myCon.delegate = self;
    myCon.searchResultsDataSource = self;
    myCon.searchResultsDelegate = self;

    /* Setup scopes */
    {
        NSMutableArray *scopes;
        NSUInteger count, i;
        NSString *aScope;

        count = SCOPE_COUNT;
        scopes = [[NSMutableArray alloc] initWithCapacity:count];
        for(i = 0; i < count; i++) {
            // I create four scopes here
        }

        myCon.searchBar.scopeButtonTitles = scopes;
        [scopes release];
    }

    [myCon release];
}

我在 -viewDidLoad <中调用上述方法/ code>我的子类 UITableViewController 的方法。不幸的是，当我的表视图控制器显示在 UITabBarController 中时没有任何反应。

I call the above method in the -viewDidLoad method of my subclassed UITableViewController. Unfortunately nothing happens when my table view controller get's displayed in a UITabBarController.

任何帮助都将不胜感激。

Any help would be greatly appreciated.

推荐答案

查看以下示例代码：
[ https://github.com/JayMarshal/GrabCasts.com-iPhone-Client/blob /master/CoreDataTableViewController.m][1]

Check out the example code in: [https://github.com/JayMarshal/GrabCasts.com-iPhone-Client/blob/master/CoreDataTableViewController.m][1]

这里回复： https://github.com/JayMarshal/Grabcasts

它是coredatatableviewcontroller的扩展版本斯坦福iOS课程。

It is an expanded version of the coredatatableviewcontroller of the stanford iOS courses.

该代码的相关片段如下：

Relevant snippet of that code follows:

- (void)createSearchBar {
if (self.searchKey.length) {
    if (self.tableView && !self.tableView.tableHeaderView) {
        UISearchBar *searchBar = [[[UISearchBar alloc] init] autorelease];
        self.searchDisplayController 
               = [[UISearchDisplayController alloc] initWithSearchBar:searchBar
                                                   contentsController:self];
        self.searchDisplayController.searchResultsDelegate = self;
        self.searchDisplayController.searchResultsDataSource = self;
        self.searchDisplayController.delegate = self;
        searchBar.frame = CGRectMake(0, 0, 0, 38);
        self.tableView.tableHeaderView = searchBar;
    }
} else {
    self.tableView.tableHeaderView = nil;
}

基本上它将UISearchDisplayController附加到self（必须是tableviewcontroller）作为初始化的副作用。所以设置：

Basically it attaches the UISearchDisplayController to self (which must be a tableviewcontroller) as a side effect of the initialization. So setting:

self.searchDisplayController.searchResultsDelegate = self;
self.searchDisplayController.searchResultsDataSource = self;

而不是

myCon.searchResultsDataSource = self;
myCon.searchResultsDelegate = self;

可以做到这一点。在调试中，检查myCon和self.searchDisplayController是否指向同一个对象？

Might do the trick. In debugging, check whether myCon and self.searchDisplayController are pointing to the same object?

更新：TVC的SDC属性中似乎有一个错误，它是不保留在runloop中。归档为： http://openradar.appspot.com/10254897 也在SO上提到，请参阅
UIViewController不保留其以编程方式创建的UISearchDisplayController

Updated: there seems to be a bug in the SDC property of the TVC that it is not retained in the runloop. Filed as: http://openradar.appspot.com/10254897 also mentioned on SO, see UIViewController does not retain its programmatically-created UISearchDisplayController

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