zoukankan      html  css  js  c++  java
  • How do I cover the “no results” text in UISearchDisplayController's searchResultTableView?

    How do I cover the “no results” text in UISearchDisplayController's searchResultTableView?


    I don't want to show the "no results" text while my server is processing a search query.

    enter image description here

    I figured out the exact coordinates of the table cell that contains the label and attempted to cover it.

    self.noResultsCoverView = [[[UIView alloc] initWithFrame:CGRectMake(
        0.0, 
        44.0, 
        320.0, 
        43.0
    )] autorelease];
    self.noResultsCoverView.backgroundColor = [UIColor whiteColor];
    [self.searchDisplayController.searchResultsTableView addSubview:self.noResultsCoverView];

    To my chagrin, my cover was above the table view, but below the label. I need the cover to be above the label. searchResultsTableView::bringSubviewToFront didn't work, which makes me believe that the label isn't a child of the searchResultsTableView at all.

    BTW, this Stack Overflow answer doesn't quite work for me. It works on the very first search, but flashes a weird black cover on subsequent searches.

    this should do the work properly. The code to return at least one cell:

    BOOL ivarNoResults; // put this somewhere in @interface or at top of @implementation
    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    {
        if (tableView == self.searchDisplayController.searchResultsTableView) {
            if (filteredList.count == 0) {
                ivarNoResults = YES;
                return 1;
            } else {
                ivarNoResults = NO;
                return [filteredList count];
            }
        }
        // {…}
        // return the unfiltered array count
    }

    and for "showing" the clean cell:

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    {
        if (tableView == self.searchDisplayController.searchResultsTableView && ivarNoResults) {
            static NSString *cleanCellIdent = @"cleanCell";
            UITableViewCell *ccell = [tableView dequeueReusableCellWithIdentifier:cleanCellIdent];
            if (ccell == nil) {
                ccell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cleanCellIdent] autorelease];
                ccell.userInteractionEnabled = NO;
            }
            return ccell;
        }
    
        // {…}
    }
    share|improve this answer
       

    You need to realize that when you have a UISearchDisplayController, and the search bar is active, the UITableView argument passed into your UITableView data source and delegate methods is in fact NOT your tableView object, but a tableView managed by theUISearchDisplayController, intended to display "live" search results (perhaps results filtered from your main data source, for example).

    You can easily detect this in code, and then return the appropriate result from the delegate/data source method, depending on which tableView object is asking.

    For example:

    - (NSInteger)tableView:(UITableView *)tv numberOfRowsInSection:(NSInteger)section
    {
        if (tv == self.searchDisplayController.searchResultsTableView) {
            // return the number of rows in section for the visible search results.
            // return a non-zero value to suppress "No results"
        } else {
            // return the number of rows in section for your main data source
        }
    }
    

    The point is that your data source and delegate methods are serving two tables, and you can (and should) check for which table is asking for data or delegation.

    By the way, the "No results" is (I believe) provided by a background image which theUISearchDisplayController displays when the delegate says there are no rows... You are not seeing a 2-row table, the first blank and the second with text "No results". At least, that's what I think is happening there.

    share|improve this answer
       

    I haven't tried it myself, you can give it a try-- Link

    Regards, 
    Amar

    share|improve this answer
       
    因为产生的UILabel@“No Resulte”有延迟,如果不延迟检测是检测不出来的

    Try this it worked for me

    In the UISearchDisplayController delegate do this:=

    - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
    {
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.001);
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            for (UIView* v in self.searchDisplayController.searchResultsTableView.subviews) {
                if ([v isKindOfClass: [UILabel class]] && 
                    [[(UILabel*)v text] isEqualToString:@"No Results"]) {
                    [(UILabel*)v setText:@""];
                    break;
                }
            }
        });
        return YES;
    }

    版权声明:本文为博主原创文章,未经博主允许不得转载。

  • 相关阅读:
    linux redis安装 5.0.2
    Linux nginx安装步骤 centos7
    fastjson JSONObject.toJSONString 出现 $ref: "$."的解决办法(重复引用)
    docker redis安装及配置(外网访问 关闭安全限制 设置密码)
    JDK dump
    mysql8 修改root密码
    docker系列详解<二>之常用命令
    获取地理位置
    js调用摄像头
    点击时扩散效果
  • 原文地址:https://www.cnblogs.com/zsw-1993/p/4879968.html
Copyright © 2011-2022 走看看