Method cellForRowAtIndexPath if (cell == nil) {} condition strange behavior

This tableView’s are making me crazy. I just tested this behavior on new test project (iPad) with one tableView. I added 30 sections with one row per section and put this line inside if( cell == nil ) {} condition in cellForRowAtIndexPath method:
NSLog(@”Creating cell %d”,indexPath.section);
When I launch application I get this in output:
Creating cell 0
Creating cell 1
Creating cell 2
Creating cell 20
Creating cell 21
Only 22 cells are visible on first run. That’s ok, tableView created only cells that are visible. So far so good.
But when I scroll down to see the rest of the cells (8 other cells) the console only shows me this:
Creating cell 22
Why did tableView skipped creating last 7 rows and used them from queue instead? isn’t that kind a strange behavior? Or maybe is this a bug in apple’s tableView? Or maybe I am wrong and don’t quite understand the background of tableView reusing…?
Any help appriciated, thanks!

Ok, I find out that this is normal and native behavior for tableView's.

Similar Messages

Strange behavior of std::string find method in SS12

Hi
I faced with strange behavior of std::string.find method while compiling with Sunstudio12.
Compiler: CC: Sun C++ 5.9 SunOS_sparc Patch 124863-14 2009/06/23
Platform: SunOS xxxxx 5.10 Generic_141414-07 sun4u sparc SUNW,Sun-Fire-V250
Sometimes find method does not work, especially when content of string is larger than several Kb and it is needed to find pattern from some non-zero position in the string
For example, I have some demonstration program which tries to parse PDF file.
It loads PDF file completely to a string and then iterately searches all ocurrences of "obj" and "endobj".
If I compile it with GCC from Solaris - it works
If I compile it with Sunstudio12 and standard STL - does not work
If I compile it with Sunstudio12 and stlport - it works.
On win32 it always works fine (by VStudio or CodeBlocks)
Is there any limitation of standard string find method in Sunstudio12 STL ?
See below the code of tool.
Compilation: CC -o teststr teststr.cpp
You can use any PDF files larger than 2kb as input to reproduce the problem.
In this case std::string failes to find "endobj" from some position in the string,
while this pattern is located there for sure.
Example of output:
CC -o teststr teststr.cpp
teststr in.pdf Processing in.pdf
Found object:1
Broken PDF, endobj is not found from position1155
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
bool parsePDF (string &content, size_t &position)
    position = content.find("obj",position);
    if( position == string::npos ) {
        cout<<"End of file"<<endl;
        return false;
    position += strlen("obj");
    size_t cur_pos = position;
    position = content.find("endobj",cur_pos);
    if( position == string::npos ){
        cerr<<"Broken PDF, endobj is not found from position"<<cur_pos<<endl;;
        return false;
    position += strlen("endobj");
    return true;
int main(int argc, char ** argv)
    if( argc < 2 ){
        cout<<"Usage:"<<argv[0]<<" [pdf files]\n";
        return -3;
    else {
        for(int i = 1;i<argc;i++) {
            ifstream pdfFile;
            pdfFile.open(argv,ios::binary);
if( pdfFile.fail()){
cerr<<"Error opening file:"<<argv[i]<<endl;
continue;
pdfFile.seekg(0,ios::end);
int length = pdfFile.tellg();
pdfFile.seekg(0,ios::beg);
char *buffer = new char [length];
if( !buffer ){
cerr<<"Cannot allocate\n";
continue;
pdfFile.read(buffer,length);
pdfFile.close();
string content;
content.insert(0,buffer,length);
delete buffer;
// the lets parse the file and find all endobj in the buffer
cout<<"Processing "<<argv[i]<<endl;
size_t start = 0;
int count = 0;
while( parsePDF(content,start) ){
cout<<"Found object:"<<++count<<"\n";
return 0;

Well, there is definitely some sort of problem here, maybe in string::find, but possibly elsewhere in the library.
Please file a bug report at [http://bugs.sun.com] and we'll have a look at it.

Strange behavior: action method not called when button submitted

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}Here is my jsp page:
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
"http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<faces-config>
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</faces-config>The problem occurs when the field ratingField is left blank (which amounts to it being set at 0 since it is an int).
Can anyone help please?
Thanks in advance,
Julien.

Hello,
Thanks for the suggestion. I added the tag and it now says:
java.lang.IllegalArgumentException
I got that from the log:
2006-08-17 15:29:16,859 DEBUG [com.sun.faces.el.ValueBindingImpl] setValue Evaluation threw exception:
java.lang.IllegalArgumentException
     at sun.reflect.GeneratedMethodAccessor118.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sun.faces.el.PropertyResolverImpl.setValue(PropertyResolverImpl.java:178)
     at com.sun.faces.el.impl.ArraySuffix.setValue(ArraySuffix.java:192)
     at com.sun.faces.el.impl.ComplexValue.setValue(ComplexValue.java:171)
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     at javax.faces.component.UIInput.processUpdates(UIInput.java:442)
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     at javax.faces.component.UIForm.processUpdates(UIForm.java:196)
     at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:935)
     at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:935)
     at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:363)
     at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:81)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
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     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
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     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
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     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
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2006-08-17 15:29:16,875 DEBUG [com.sun.faces.context.FacesContextImpl] Adding Message[sourceId=searchForm:ratingField,summary=java.lang.IllegalArgumentException)Do you see where the problem comes from??
Julien.

Strange behavior after using NIK plug-ins

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!http://users.skynet.be/fc419085/Aperture-1.jpg!
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!http://users.skynet.be/fc419085/Aperture-2.jpg!
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This may be a problem?NO!
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Please find below
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09-JAN-11
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        btnClick.textProperty().set("Click me");
        final Label lblStatus = new Label();
        lblStatus.setWrapText(true);
        gridPane.add(lblText1, 0, 0, 1, 1);
        gridPane.add(lblText2, 1, 0);
        gridPane.add(lblStatus, 0, 2, 2, 1);
        gridPane.add(btnClick, 0, 3, 2, 1);
        btnClick.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                lblStatus.setText("very long text, very long text, very long text, very long text,very long text, very long text");
        gridPane.setGridLinesVisible(true);
        Scene scene = new Scene(gridPane, 300, 300);
        stage.setScene(scene);
        stage.show();
}Edited by: csh on 19.07.2012 03:35

It seems the Label doesn't like it, that it is in a GridCell with rowspan = 2
If it is in a normal cell (no rowspan), it works.
If I add ColumnConstraints to the gridpane, it kind of works, but the Label still occupies more space than it should.
Edited by: csh on 19.07.2012 03:51

Strange behavior of system with enabled FileVault2, Roaming profile

Hello,
I have encountered strange behavor of my Macbook Air after some testing.
Macbook Air 2012 was newly installed with 10.8.4 and joined network account server on 10.8.4 server with Roaming profile (synced with server home directory). After installing some basic apps like iWork I turned on FileVault.
Then I start to have the strange behavior - iWorks are not displaying content of document - it seams blank - just white screen without any borders where should be at least lines in numbers or empty cells.
Another display problem is in Safari. On same pages (even default Top SItes) it`s flashing and especially when scrolling.
Did you encountered something similar? I`m not able to get rid of it.
Computers was used for some time before turining on FIle Vault and problem started to occur after this action. Disabling of FileVault didn`t helped (properly restarted between steps).
I didn`t found anything strange in Console or elsewhere..

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.

Strange behavior of JTable..Help plz

Hi,
Assume i have 5 rows in my JTable. I wrote a function on right click i get a popup window with an option delete row, which deletes the row successfully,
The problem is when i sort the data in JTable. on column click JTable is getting sorted, in which assume 2nd row got replaced with 4th row and vice versa.
Now when i try to delete the 4th row, it is delete the 2nd row data, which was there at the place of 4th row before sorting. In this regard i am trying to print the row number before deleting. It is displaying as 4th, but deleting 2nd row.
Hope i am clear. Please suggest me in solving this strange behavior of JTable sorting problem.
Regards,
Ravi

MyTableModel tablemodel = new MyTableModel(colnames,values);
TableSorter sorter = new TableSorter(tablemodel);
JTable table = new JTable(sorter)
tablemodel.removeRow(row); // last line is the code where i am deleting the row, it's deleting the wrong row.
do i need to remove the last line code and make respective changes in TableSorter.java class.
ore
here itself do i need to do some changes. ?
There is a method that will convert the view row to the model row private Row[] getViewToModel()
my question is how TableSorter.java class comes to know that i am deleting the perticular row.

Strange behavior of GetStringUTFChars in Linux

Good evening!
I made an implementation of a native method in C++ for Windows and Linux, in windows it works fine, but in Linux I have a strange behavior of GetStringUTFChars here is the piece code :
JNIEXPORT jint JNICALL Java_MyNativeMethod
(JNIEnv *env, jobject obj, jstring IpAddress) {
const char * ccpIpAddress = env->GetStringUTFChars(IpAddress, 0);
jsize size = env->GetStringLength(ccpIpAddress);
trace("IpAddress : %s size: %d", ccpIpAddress, size);
Absolute normal... but when I pass as parameter a string '192.168.1.11'
I receive from 'IpAddress : HBĽ1 size: 0' to 'IpAddress : P9D7D6DwD�MS\H#M\H : 251'
I made a little and simple test to print a String to verify if is Linux problem but IT WORKED FINE!
I've notice that the differences between both programs are that the wrong one has been linked with a C lib, but the #define __cplusplus is OK also, and all the compile process use C++ code...
This is my compilation line
g++ -o lib{myLib}.so {myImpl}.cpp lib{C li}.so libstdc++.so -I {JAVA_HOME}/include/ -I {JAVA_HOME}/include/linux/ -shared -static -L{JAVA_HOME}/jre/lib/i386/
(variables put for clarity) and (I tried with gcc also)
the libstrd++.so is been used in my simple test link options too.
I was wondering if there is some -Doption which should be defined that
functions->GetStringChars(this,str,isCopy); implementation ask for...
or if the link with a C code is messing the things in a different behavior
Thanks for the help
Pedro Ribeiro
Sao Paulo - Brazil

JNIEXPORT jint JNICALL Java_MyNativeMethod
(JNIEnv *env, jobject obj, jstring IpAddress) {
const char * ccpIpAddress = env->GetStringUTFChars(IpAddress, 0);
jsize size = env->GetStringLength(ccpIpAddress);
trace("IpAddress : %s size: %d", ccpIpAddress, size);
=====================
You tried to get the string length of C character array.
I think you can get the length of jstring alone.
Please advice me if I am wrong

Strange behavior of flex4 service call

Hi Techies, I am stuck with strange behavior of flex4 service call. Our is a dashboard application where i have four modules(separae file for each) in a page. when page renders all these modules makes separate service call through remote objects. Though destination file is same but methods are separate for each modules. db+java takes 5 second for 1 and 3 module, 9 seconds for third module and 15 seconds for 4th module. Sinch LCDS calls are asynchronous ideally after 5 seconds module 1 and 2 should display data. similarly for 3rd module after 9seconds. For my wonder it doesnt go this way. data for all the modules appears simultaneously after 15-16 seconds. It behaves like when data for all the modules is available then only it populates charts and grids. Looks like call is being made in sequence and once maximum taking method is done then control returns back to flex. Any pointer will be helpful to improvise this.
Thanks,
Rohit

Hi Techies, I am stuck with strange behavior of flex4 service call. Our is a dashboard application where i have four modules(separae file for each) in a page. when page renders all these modules makes separate service call through remote objects. Though destination file is same but methods are separate for each modules. db+java takes 5 second for 1 and 3 module, 9 seconds for third module and 15 seconds for 4th module. Sinch LCDS calls are asynchronous ideally after 5 seconds module 1 and 2 should display data. similarly for 3rd module after 9seconds. For my wonder it doesnt go this way. data for all the modules appears simultaneously after 15-16 seconds. It behaves like when data for all the modules is available then only it populates charts and grids. Looks like call is being made in sequence and once maximum taking method is done then control returns back to flex. Any pointer will be helpful to improvise this.
Thanks,
Rohit

String.replaceAll strange behavior...

I have found strange behavior of String.replaceAll method:
"aaaabaaaa".replaceAll("b","a"); // working fine
"aaaabaaaa".replaceAll("b","a${"); // throws an exceptionThat could be probably a bug?
p.s. using jdk_1.6.0_12-b04

Welcome to the Sun forums.
>
"aaaabaaaa".replaceAll("b","a${"); // throws an exception
Please always copy/paste the [exact error message|http://pscode.org/javafaq.html#exact]. We do not have crystal ball, and cannot see the output on your PC.
>
That could be probably a bug? >(chuckle) It has more to do with special characters in Strings, that need to be escaped. I am not up on the fine details, but try this code.
import javax.swing.*;
class TestStringReplace {
public static void main(String[] args) {
    String result = "aaaabaaaa".replaceAll("b","c"); // working fine
    JOptionPane.showMessageDialog(null, result);
    result = "aaaabaaaa".replaceAll("b","c\\${"); // chars escaped
    JOptionPane.showMessageDialog(null, result);
}

JDEV Team: Strange behavior in TOMCAT using DATATAGS (VERY CRITICAL)

I am encountering some strange behavior when I deploy my application to TOMCAT.
If I run in JDeveloper (webtogo) everything works fine but the behavior changes completely in TOMCAT.
Let me try and explain my situation here.
I have 3 jsps :
1.iss_listApps.jsp which is used to browse all the available records, allows the user to navigate to a specific record and edit or delete.
2. app_edit.jsp which is used to edit/delete a specific row passed from iss_listApps.jsp.
3. app_edit_post.jsp which is used to save the changes.
Note that I use an anchor ">Edit</a> to pass a row from the browser page to the edit page.
For your convenience I have listed all the source files below.
Now here are my problems:
Problem 1. If I run it in JDeveloper, I am able to browse the records and go to a specific record to edit and delete by clicking on the "Edit" anchor provided in the browser page.
I can also go to the edit page and backout out of it by not saving the changes. In that case I am back in my browser page and I can again click on the "Edit" anchor to a specific record.
However if I am in TOMCAT, I am able to browse and go to a specific record so long as I make changes to it and save it. If for any reason, I do not save a record and I go back to my browser
page then any subsequent calls to to edit a specific record goes to the same OLD RECORD that I did not save.
I fail to understand why? Maybe the "webtogo" server automatically refreshes when I click on the "back tab". If so, how do I automatically refresh a jsp page when I click on the "back tab" in TOMCAT.
I would sincerely appreciate any help on this.
Problem 2. I have an include jsp tag in my browser page. defined as
<jsp:include page="Message.jsp" flush="true">
<jsp:param name="colspan" value="2"/>
</jsp:include>.
This section of the code is currently commented out because if I uncomment it then it runs ok in JDeveloper but in Tomcat it causes the browser page to always navigate to the first record if I want to edit a specific record.
I would sincerely appreciate any answer on this.
Here are my source files:
1. iss_ListApps.jsp (browser page). Please see how the anchor is formed. It causes no problems
in JDeveloper.
<%@ page contentType="text/html;charset=WINDOWS-1252"%>
<HTML>
<base target="contentsframe">
<head>
</head>
<body>
<%@ taglib uri="/webapp/DataTags.tld" prefix="jbo" %>
<jbo:ApplicationModule id="NewBC4J.NewBC4JModule" configname="NewBC4J.NewBC4JModule.NewBC4JModuleLocal" username="issue" password="issue"/>
<jbo:RollBack appid="NewBC4J.NewBC4JModule" />
<jbo:DataSource id="app_vo" appid="NewBC4J.NewBC4JModule" viewobject="ApplicationsView" ></jbo:DataSource>
<jbo:RefreshDataSource datasource="app_vo" />
<table width="100%" bgcolor="tan" border="0" align="center" cellpadding="3" cellspacing="0">
<%--
<jsp:include page="Message.jsp" flush="true">
<jsp:param name="colspan" value="2"/>
</jsp:include> --%>
<form name="list" target="body" action="app_edit.jsp" method="post">
<tr><th colspan="4">List of Valid Applications</th></tr>
<tr>
<th> </th>
<th align="left"><u>Code</u></th>
<th align="left"><u>Name</u></th>
<th align="left"><u>Description</u></th>
</tr>
<tr>
<jbo:RowsetIterate datasource="app_vo">
<td>
<a href="app_edit.jsp?RowKeyValue=<jbo:ShowValue datasource="app_vo" dataitem="RowKey"/>">Edit</a>
</td>
<td>
<jbo:ShowValue datasource="app_vo" dataitem="Code" />
</td>
<td>
<jbo:ShowValue datasource="app_vo" dataitem="Name" />
</td>
<td>
<jbo:ShowValue datasource="app_vo" dataitem="A ppDesc" />
</td>
</tr>
</jbo:RowsetIterate>
</form>
</table>
<table width="100%" bgcolor="skyblue" align="center" cellpadding="10" cellspacing="0" >
<tr>
<form NAME="AddForm" action="app_add.jsp">
<td>
<input type = "submit" name="submit" value="Add" align="center" >
</td>
</form>
</tr>
</table>
</body>
<jbo:ReleasePageResources releasemode="Stateful" appid="NewBC4J.NewBC4JModule" />
</html>
2. Second Source File: app_edit.jsp (Allows editing of a record)
<%@ page contentType="text/html;charset=WINDOWS-1252"%>
<HTML>
<base target="contentsframe">
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=WINDOWS-1252">
<META NAME="GENERATOR" CONTENT="Oracle JDeveloper">
<TITLE>
</TITLE>
</HEAD>
<BODY>
<%@ taglib uri="/webapp/DataTags.tld" prefix="jbo" %>
<jbo:ApplicationModule id="NewBC4J.NewBC4JModule" configname="NewBC4J.NewBC4JModule.NewBC4JModuleLocal" />
<jbo:DataSource id="app_vo" appid="NewBC4J.NewBC4JModule" viewobject="ApplicationsView" />
<jbo:Row id="myrow" datasource="app_vo" rowkeyparam="RowKeyValue" action="Find">
<jbo:SetAttribute dataitem="*"/>
</jbo:Row>
<table width="100%" bgcolor="skyblue" border="0" align="center">
<tr>
<td>
<table width="100%" bgcolor="tan" border="0" align="center" cellpadding="3" cellspacing="0">
<form NAME="iForm" action="app_edit_post.jsp">
<tr>
<th colspan="2">
"Edit/Delete Applications"
</th>
</tr>
<jsp:include page="Message.jsp" flush="true">
<jsp:param name="colspan" value="2"/>
</jsp:include>
<tr>
<td align="right"><b><font color="red"> Name:</font></b></td>
<td> <jbo:InputText datasource="app_vo" dataitem="Name" cols="50" />
</td>
</tr>
<tr>
<td align="Right"><b><font color="red"> Description: </font></b></td>
<td> <jbo:InputTextArea datasource="app_vo" dataitem="AppDesc" cols="50" rows="5" />
</td>
</tr>
</table>

<table width="100%" bgcolor="skyblue" align="center" cellpadding="10" cellspacing="0" >
<tr>
<input name="RowKeyValue" type="hidden" value="<jbo:ShowValue datasource="app_vo" dataitem="RowKey"/>" />
<td>
<input type = "submit" name="submit" value="Save">
</td>
</form>
<form NAME="DelForm" action="app_del_post.jsp">
<input name="RowKeyVal" type="hidden" value="<jbo:ShowValue datasource="app_vo" dataitem="RowKey"/>" />
<td>
<input type = "submit" name="submit" value="Delete">
</td>
</form>
</tr>
</table>
</td>
</tr>
</table>
</BODY>
</HTML>
<jbo:ReleasePageResources releasemode="Stateful" />
3. Third source file app_edit_post.jsp (ALlows saving the changes made to a specific record)
<%@ page contentType="text/html;charset=ISO-8859-1"%>
<HTML>
<BODY>
<%@ taglib uri="/webapp/DataTags.tld" prefix="jbo" %>
<jbo:ApplicationModule id="NewBC4J.NewBC4JModule" configname="NewBC4J.NewBC4JModule.NewBC4JModuleLocal" />
<jbo:DataSource id="app_vo" appid="NewBC4J.NewBC4JModule" viewobject="ApplicationsView" ></jbo:DataSource>
<%
try
%>
<jbo:Row id="row3" datasource="app_vo" rowkeyparam="RowKeyValue" action="Update" >
<jbo:SetAttribute dataitem="*" />
</jbo:Row>
<jbo:Commit appid="NewBC4J.NewBC4JModule" />
<p><font face="Arial, Helvetica, sans-serif"><b><font color="006699">Application Successfully Updated</b></font></font> </p>
<%
catch(Exception exc)
out.println("<pre> ");
exc.printStackTrace(new java.io.PrintWriter(out));
out.println("</pre>");
%>
<br>
<br>
<form action="app_ListApps.jsp" method="post"><input type="submit" value="Click to Continue"></form
<jbo:ReleasePageResources releasemode="Stateful" />
</BODY>
</HTML>
null

I would not expect the 'back' button to automatically refresh the page. This button basically traverses the history of pages. Since Tomcat is caching your pages, you can try to control it's interaction with the browser by:
1. Adding cache control pragmas to the returned content so it doesn't get cached.(look at www.w3c.org at the HTTP spec)
2. dont rely on the back button, place a link on your pages to go back to the list page.
3. change your cache control settings in your browser to check for a new page every time a url is visited.

Method cellForRowAtIndexPath if (cell == nil) {} condition strange behavior

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