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对于 UISearchBar 的 textDidChange 委托方法，我遇到了一个非常奇怪的行为。这是我的代码

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{

    searchText = [searchText stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    if (![searchText isEqualToString:@""]) {

        [self searchedWithText:searchText]; // I am using this method to fetch my search results from coredata

        [searchBar becomeFirstResponder]; // For making the search field active
    }

}

-(void)searchedWithText:(NSString *)searchText {

    // In this method the type of searchText is shown as NSTaggedPointerString and the value is nil

}

我在委托方法中为 searchBar 做了一个 po 并收到以下消息

(lldb) po searchBar
error: warning: couldn't get cmd pointer (substituting NULL): extracting data from value failed
Couldn't materialize: couldn't get the value of variable searchBar: variable not available
Errored out in Execute, couldn't PrepareToExecuteJITExpression

我的问题是我的 searchedWithText 方法中的 searchText 参数为零。所以 coredata 的结果是零。我在这里做错了什么？提前致谢

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