Question

我有一个带有搜索栏的表格视图，我想在文本为空时进行搜索。

我希望在搜索文本为空时显示所有数据（当用户未键入任何搜索文本时）

注意 - 工作正常，输入搜索文本时，问题仅在搜索文本为空时

不幸的是，当搜索文本为空时，不会使用self.arForSearch数组的内容。

我甚至尝试用"p"替换文本，但数据未加载。

问题如果用户未输入搜索字符串，如何显示所有数据？

代码粘贴在下面：

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    if(searchString.length == 0)
    {
        searchString = @"p";
        NSLog(@"string was empty but was replaced by p");
    }

    [self filterContentForSearchText:searchString];

    // Return YES to cause the search result table view to be reloaded.
    return YES;
}

- (void)filterContentForSearchText:(NSString*)str{
    // for inCaseSensitive search
    str = [str uppercaseString];

    NSMutableArray *ar=[NSMutableArray array];
    for (NSDictionary *d in self.arForTable) {
        NSString *strOriginal = [d valueForKey:@"name"];
        // for inCaseSensitive search
        strOriginal = [strOriginal uppercaseString];

        if([strOriginal hasPrefix:str]) {
            [ar addObject:d];
        }
    }
    self.arForSearch=[NSArray arrayWithArray:ar];

    NSLog(@"self.arForSearch.count = %i", self.arForSearch.count);
}

Answer 1

- (void)filterContentForSearchText:(NSString*)str{
// for inCaseSensitive search
str = [str uppercaseString];

if([str isEqualToString:@""] || str == nil)
{
     self.arForSearch=[NSArray arrayWithArray:self.arForTable];
}
else
{
    NSMutableArray *ar=[NSMutableArray array];
    for (NSDictionary *d in self.arForTable) {
         NSString *strOriginal = [d valueForKey:@"name"];
        // for inCaseSensitive search
        strOriginal = [strOriginal uppercaseString];

        if([strOriginal hasPrefix:str]) {
            [ar addObject:d];
        }
    }
    self.arForSearch=[NSArray arrayWithArray:ar];
}
NSLog(@"self.arForSearch.count = %i", self.arForSearch.count);

//updated code
[yourTable reloadData];

}

检查空字符串并将self.arForTable中的所有元素添加到self.arForSearch。

希望这会有所帮助......

更新.... 那么你可能需要添加一行[yourTable reloadData];最后会刷新表格数据

Answer 2

我编写了以下代码，以便在搜索栏获得焦点时以及没有文本时显示结果。

注意：在我的应用中，搜索栏占位符等于最后插入的搜索文本，因此您可能需要调整以下代码。

//auxiliar function to force display of search results
-(void)forceDisplaySuggestionsForText:(NSString*)searchString {
    UISearchDisplayController *sdc = self.searchDisplayController;
    SEL sel = @selector(searchBar:textDidChange:);
    if([sdc respondsToSelector:sel]){
        UISearchBar *sb = sdc.searchBar;
        [sdc performSelector:sel withObject:sb withObject:searchString];
    }
}

- (void) searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller {
    controller.searchBar.text = controller.searchBar.placeholder;
    //this will force initial display of the search results
    [self performSelector:@selector(forceDisplaySuggestionsForText:) withObject:controller.searchBar.text afterDelay:0];
}

- (void)filterContentForSearchText:(NSString*)str {
    //this will force display of results when there is no text in search bar
    if([str length] == 0){
        [self performSelector:@selector(forceDisplaySuggestionsForText:) withObject:@" " afterDelay:0];
    }
    //the rest of the code for content filtering
    ...
}

ios - 当搜索文本为空时，UISearchDisplayDelegate不会搜索

2 个答案: