动态更改UISearchBar的键盘类型 [英] Dynamically Changing Keyboard Type for a UISearchBar

问题描述

我有一个使用 UISearchBar 和 UISearchDisplayController 的iPhone应用程式。搜索栏有三个范围按钮。我想在选择特定范围按钮时将键盘设置为数字键盘，但当选择任何其他范围按钮时，键盘将成为默认键盘。

I have an iPhone app that uses a UISearchBar and UISearchDisplayController. The search bar has three scope buttons. I would like the keyboard to be a numeric keypad when a particular scope button is selected, but be a default keyboard when any other scope button is selected.

UISearchBarDelegate selectedScopeButtonIndexDidChange：selectedScope 方法如下：

- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope
{
    switch (selectedScope) {
        case DeviceIDScopeIndex:
            searchBar.keyboardType = UIKeyboardTypeNumberPad;
            break;
        default:
            searchBar.keyboardType = UIKeyboardTypeDefault;
            break;
    }
}

我知道该方法被调用，选择所讨论的按钮时触发情况。但是屏幕键盘不会更改，除非我点击取消按钮隐藏键盘，然后再次点击搜索字段再次打开键盘。

I know that the method gets called, and the right case gets triggered when the button in question is selected. But the onscreen keyboard doesn't change unless I tap the Cancel button to hide the keyboard, then tap the search field again to bring up the keyboard again.

有

推荐答案

虽然这个方法可以让键盘在屏幕上自行改变，或者以编程方式隐藏它，然后重新显示它。是对我有用的：

Even though this is kind of a hack, this worked for me:

- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope {


    switch (selectedScope) {
    case 0:
       searchBar.keyboardType = UIKeyboardTypeNumberPad;
        break;
   default:
        searchBar.keyboardType = UIKeyboardTypeDefault;
        break;


    // Hack: force ui to reflect changed keyboard type
    [searchBar resignFirstResponder];
    [searchBar becomeFirstResponder];

}

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