cell

iOS界面流畅技巧之微博 Demo 性能优化技巧

|▌冷眼眸甩不掉的悲伤 提交于 2019-12-05 02:24:50
微博 Demo 性能优化技巧 我为了演示 YYKit 的功能,实现了微博和 Twitter 的 Demo,并为它们做了不少性能优化,下面就是优化时用到的一些技巧。 预排版 当获取到 API JSON 数据后,我会把每条 Cell 需要的数据都在后台线程计算并封装为一个布局对象 CellLayout。CellLayout 包含所有文本的 CoreText 排版结果、Cell 内部每个控件的高度、Cell 的整体高度。每个 CellLayout 的内存占用并不多,所以当生成后,可以全部缓存到内存,以供稍后使用。这样,TableView 在请求各个高度函数时,不会消耗任何多余计算量;当把 CellLayout 设置到 Cell 内部时,Cell 内部也不用再计算布局了。 对于通常的 TableView 来说,提前在后台计算好布局结果是非常重要的一个性能优化点。为了达到最高性能,你可能需要牺牲一些开发速度,不要用 Autolayout 等技术,少用 UILabel 等文本控件。但如果你对性能的要求并不那么高,可以尝试用 TableView 的预估高度的功能,并把每个 Cell 高度缓存下来。这里有个来自百度知道团队的开源项目可以很方便的帮你实现这一点:FDTemplateLayoutCell。 预渲染 微博的头像在某次改版中换成了圆形,所以我也跟进了一下。当头像下载下来后

ExcelUtil工具类

吃可爱长大的小学妹 提交于 2019-12-05 02:10:27
若依项目中的工具类,可以读取FTP输入流中的Excel表格 import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.math.BigDecimal; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.UUID; import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.ss.usermodel.BorderStyle; import org.apache.poi.ss.usermodel

Table cells fixed height regardless the content of the cell

杀马特。学长 韩版系。学妹 提交于 2019-12-05 00:51:52
I have a dynamic table that I generate after getting some inputs from the user to present some tabular data. I need to know if there is away to assign a fixed height for the cells even if some of them have some content / text. I would like all the cells to have 30px height regardless if they have content or if they are empty. This is the CSS I have: table { width: 90%; height:100%; } table th, table td { border: 1px solid gray; height:30px !important; padding: 9px !important; width: 16%; } The table is generated by this code: foreach ( $this->rows as $i => $row ) { $tbody_tr = NHtml::el ('tr

ExtJS 4 GridView - How to get cell's td or div?

南笙酒味 提交于 2019-12-04 23:24:08
问题 In GridPanel, we all know that we can specify renderer in a column configuration to have customized cell. Now there is this special case which I need to build a customized visual progress bar (canvas) to be drawn into a cell, my question is how to get the el of the cell ? In the renderer callback, available values are value , metadata , record , rowIndex , columnIndex , store , and view . I have tried view.getNode or view.getCell with no luck still. Thanks you in advance! /Lionel EDIT After

JavaFX Set Cell Background Color of TableColumn

心不动则不痛 提交于 2019-12-04 21:21:02
TableColumn tc = new TableColumn(); tc.getStyleClass.add(".style in css file") I set up the TableColumn with a CSS file, and I want to give each cell different background colors. How can I accomplish this? Example) TableColumn 1~5 TableColumn 1, row 3 has black and TableColumn 5, row 4 has green ... etc Create a cellFactory that selects the background color based on the column & row index. Example: TableView<Item<String>> tableView = new TableView<>(); // sample item class contains a single property with the same type as the type parameter (String in this case) tableView.getItems().addAll( new

Swift - Segue from Button inside a cell

寵の児 提交于 2019-12-04 21:00:53
问题 i have a custom cell attached to TableViewCell class, and i have a button inside that custom cell, i want whey i press the button it segues to another view controller, but the: performSegueWithIdentifier(identifier: String, sender: AnyObject?) function is not recognised, how to fix that ? Edit: 回答1: -performSegueWithIdentifier: method is declared in UIViewController . So you can't just call it in UITableViewCell subclass. You can add an action to that button when you are creating cell in

UITableView 的更多属性

送分小仙女□ 提交于 2019-12-04 19:17:54
1. UITableView的初始化 [csharp] UITableView tableview= [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 420)]; [tableview setDelegate:self]; [tableview setDataSource:self]; [self.view addSubview: tableview]; [tableview release]; (1)在初始化UITableView的时候必须实现UITableView的是,在.h文件中要继承UITableViewDelegate和UITableViewDataSource,并实现3个UITableView数据源方法和设置它的delegate为self,这个是在不直接继承UITableViewController实现的方法。 (2) 直接在XCODE生成项目的时候继承UITableViewController的,它会帮你自动写好UITableView必须要实现的方法。 (3) UITableView继承自UIScrollView。 2. UITableView的数据源 (1) UITableView是依赖外部资源为新表格单元填上内容的,我们称为数据源,这个数据源可以根据索引路径提供表格单元格,在UITableView中

Custom Java-fx cellfactory messes up the setCellValueFactory

China☆狼群 提交于 2019-12-04 17:11:34
After messing around with Netbeans and Scenebuilder for a while I'm stuck at a problem I can't quite understand. I use a custom cellfactory to bind a doubleclick event to the cells in my tableview. But when I set the cellfactory and a cellValueFactory only the custom cellFactory has an effect. I'm trying to populate a tableview with data from a number of objects and bind a double click event to the cells of the first column. Populating is not the problem, I just used idNumber.setCellValueFactory(new PropertyValueFactory<LiveStock, String>("idNumber")); status.setCellValueFactory(new

Retrieving extracted text with Apache Solr

好久不见. 提交于 2019-12-04 16:01:36
I'm new to Apache Solr, and I want to use it for indexing pdf files. I managed to get it up and running so far and I can now search for added pdf files. However, I need to be able to retrieve the searched text from the results. I found an xml snippet in the default solrconfig.xml concerning exactly that: <requestHandler name="/update/extract" class="org.apache.solr.handler.extraction.ExtractingRequestHandler" startup="lazy"> <lst name="defaults"> <!-- All the main content goes into "text"... if you need to return the extracted text or do highlighting, use a stored field. --> <str name="fmap

关于cell的一些操作

眉间皱痕 提交于 2019-12-04 15:55:00
如图所示:说明tableView是分组显示的,每组的头部显示日期,row显示cell。 cell中可能存在按钮,则需要使用block将点击事件传到控制器。 程序代码如下: 1、初始化tableView - (void)initWithTableView { self.myTableView.dataSource = self; self.myTableView.delegate = self; [self.myTableView registerNib:[UINib nibWithNibName:[QHBuriedTreasureHistoryTableViewCell identifier] bundle:nil] forCellReuseIdentifier:[QHBuriedTreasureHistoryTableViewCell identifier]]; self.myTableView.tableFooterView = [UIView new]; _listDataArray = [NSMutableArray arrayWithCapacity:1]; [self prepareRefresh]; self.myTableView.separatorStyle = UITableViewCellSeparatorStyleNone; _myTableView.mj