Reload Tableview on Tapping Header view

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This is just what I needed. Note, that this subscript returns an optional value.

When the user selects a segment, the section below the header should be reloaded with a nice UITableViewRowAnimation. And I have created a public method on the tableview controller to reload Data. Then follow the instruction and setup the project.

How to reload a section of a TableView?

While giving many designers a headache the Twitter app still serves as template on how to solve a variety of UX riddles. One of which is the situation where one might want to have sections in a tableview that possess the ability to expand from one row to several and collapse vice versa. The eye of the experienced developer sees two challenges contained therein: 1 grafting a mechanism for collapsing and expanding onto UITableView in a reusable way 2 making custom accessory views that look like a rotated version of the disclosure indicator, pointing upwards or downwards and also changing color when highlighted. In this article I present my solution to this UX riddle. At the same time I will demonstrate how NSMutableIndexSet can be used to our advantage. In contrast to the pull-to-reload method , this does not contain anything remotely patentable. Update March 12th, 2013: Cleaned up version of the custom-colored accessory is now available via , the example project is now part of our. Please note that if you use this code you have to attribute it to us or buy a Non-Attribution License. I could not figure out a way to get this functionality as class extension, which would have been nice. But this is not possible if you need an instance variable to keep track of something. The finished subclass will look and behave just like the original Twitter app for iPhone does. We start out by creating a new UITableView subclass which has a NSMutableSet instance variable to contain the section numbers which are already expanded. It has methods to add such a number, remove it and query if it is contained in it. Being a set means that it is not ordered and each entry is automatically unique. In this example I make sections 1 and 2 such, section 0 cannot expand. The mutable index set gets instantiated in viewDidLoad and released in dealloc. So far so good. Knowing what I told you above about index set you can easily see how this is used to determine whether a section should show as expanded or collapsed. If the index is in the set, then numberOfRowsInSection returns the full number of detail cells, otherwise 1 for the header. The expansion and collapse animation is simply achieved by using the built-in tableview animations to insert and delete cells. So: first make sure that the number is changed, then call the animation. Now, let me also give you the custom accessory view, which is based on my previous article on how to I simply added a type enum and modifications in drawRect. What have we learned? NSIndexSet is a comfortable way to store indexes. And finally we can go the extra mile and create a custom accessory view that also reacts appropriately to being highlighted. Hi Oliver Good timing — I was going to build something like this today myself. One question, I noticed clicking on your custom accessory button does nothing. What are your thoughts? Cheers Rob There is no need, but generally delegate methods should contain the name of who is calling the delegate so that you know where this method belongs to. Also it enables the developer to use the same table view controller for multiple table views because you can change the returned value based on which table it is for. Hi , I am new to Objective c. I am also facing a similar problem that u explain in your example. In this example u r having only row per section which can be expanded but in my problem i have multiple rows in each section and all the rows can be expanded. For Ex: I have list of stores which i am showing as rows of a section , now on click of stores user should be able to see clients for that store. Store row should expand and client rows should appear below it. I am not able to achieve this problem. Kindly help me how to expand and collapse multiple rows in a section. Row at index 1 in the force-expanded section with the lowest number index gets the DTCustomColoredAccessory, which, depending on the section, will either control the next section down or just plain crash the app with an uncaught exception invalid row count. I can post some code. I would like to thank you very much for the time you have spent to create this helpful article. I would like to ask one question pertaining to your article. What if I only want one row to be expanded at a time? I would like if you tap a row, it expands as usual. But if you tap another; it returns the previous cell to normal, and then it expands the new cell! So there will be only one expanded row at a time. This is just what I needed. Once I reverted back to using ivars the errors disappeared. How can I update the code to suit later versions of iOS 5 and 6 preferably. So I changed the cellForRowAtIndexPath a little bit. Everything else works fine still but the custom cell does not show up. Instead there is a blank cell. The custom cell works. I put it in a separate project to test it out and the custom cell appears. The custom cell has only 2 labels and a button. Hi, Thanks a lot for the post. I have modified the code in which I can keep track and close the previous section. At one point of time, only one section would be opened. Above code have only one time show the child list for same parent. It should display all the row from array with respective expandable rows.

The function you're using now is called multiple times so it's entirely inappropriate for attaching events. We could do the easy thing and perform a reloadData tableview reload sections would reload the entire table view with a prime. Connect Firebase As an example, we will use a a Firebase, that provides some real-time functionality. The naive approach is to simply update the data source e. Thanks everyone for the contribution. The finished subclass will look and behave just like the original Twitter app for iPhone caballeros. Is this a know issue. Also it enables the developer to use the same table view controller for multiple table views because you can change the returned value based on which table it is for. We are ready to pass the changes to the TableView and give it a try. We anon map these changes into UITableView's delete, insert and reload methods to affect each section and row that changed. This was the case I found myself in most recently when I was trying to refresh the contents of a table that was displaying a list of feeds from Jaiku.