Ios uitableview update row

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Ios uitableview update row

Adding rows to a UITableView is a common task, whether you are building a todo app, some kind of social network or anything else that needs to display a list of items that will get updated whenever new data has been added will need to be able to add a new row to that UITableView.

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In this post we will learn how we can add rows to a UITableView. There are two ways that we will go over in order to update the UITableView.

I am going to assume that you have a UITableView setup and working. Before we get into the tutorial I will go over the test app that I have created so that you have some more context when we go over adding new rows to the UITableView. My test app is as simple as it gets when it comes to implementing a UITableViewbut I also have a button that will add a new item to my data.

This is how my app looks:. The button has an action which will add mercury to the above data array later on in the tutorial, at the moment, it looks like this:. This will add a new row to our UITableView because we have added mercury to our data and then we called reloadData. Doing this is fine if your data is not too big but the major drawback for using reloadData is that it will reload the entire UITableView which is not efficient. In Step 2 we will look at another way to add a row to our UITableView which is way more efficient and it is a better experience for the user.

If I build and run the app it will look like this after I have clicked on Add Mercury :. Let's start with adding a new row at the end of the UITableView.

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The outcome will be very similar to the outcome from Step 1but this will be more efficient and it will also have a nice animation. This method takes two closures, the first closure will insertreloaddelete and move rows, the second closure will allow you to run some code when the action is completed. This allows us to insert rows at a specific IndexPath. It will also allow us to insert multiple rows as it takes an array of IndexPath. In our case it will be the last indexPath that we have because we are inserting our row at the bottom 0f the UITableView that is why we use self.

We also only have one section, so we will pass through 0 as our section. The insertRows method has a second argument which allows us to animate the inserting of our new row. I have used.

ios uitableview update row

There are two changes that have been made to this code. The first change is that instead of using self. This means that we are adding mercury to our array, but we are adding at index 2.

The next update is to the the IndexPath. Previously we used seld. We do this because it matches the index where we inserted mercury into the data array. If you want to reload a section you can also use the reloadSection function, but again, make sure that when you are inserting, deleting or moving an item that you do it in the most efficient way possible.

If you want the full source code you can find it here. What is in my test app My test app is as simple as it gets when it comes to implementing a UITableViewbut I also have a button that will add a new item to my data.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Nothing fancy. Due to this, my table view is always empty at start up no cell unless the array data source is filled with something.

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I am doing this because I would like to see at least some empty cells when there is no data. Meaning it will show on start up at least 10 empty cells. To add data to the cell, I call the delegate method in my tableviewcontroller each and every time to add one single entity in the data array am doing this, because I think it would be faster than waiting until the whole array is filled then call [self.

But it crashed every single time when it reached to index 10 error The one thing I am doing to cell customization is in willDisplayCell: What I did there is to change the background color of the cell.

Again, nothing fancy. But since there is no data at start up, no cell is ever visible ui tablew with no cell at displayed at allunless I did this. Using reloadData is to refresh no problem, but since I am updating the data source array in table view every time data is ready instead of saving all prepared data to this array and send it over to table view to update by using reloadData, I would like to update row by row. I kind of feel that the error comes from the fact that, if I add one item in the array and then call reloadRowsAtIndexPath, it will say "Ok, you had one item before, but after update there is 2!

I have already tried using [tableView beginUpdate]; and [tableView endUpdate]; Nothing has worked so far So to sum up: how can I have different colors of cells showing even when the data array is empty on start up just like the default ui table view with cells displaying completely even with no data and update just one of the cells once a piece of data is ready instead of updating the whole ui table view with reloadData? Don't have an empty array, have a mutable array where all the members are initially empty strings, and replace those with your real data when you get it.

If you want to see the table update row by row slow enough to seethen put your data in a temporary array first, then add it one element at a time using performSelector:withObject:afterDelay:, calling reloadRowsAtIndexPaths:withRowAnimation: after each addition. It's a little hard to tell exactly what you want, but here is an example of what I mean.

This table displays 20 empty rows, all with different colors, for 2 seconds, then it replaces the empty strings in displayData with the strings in theData one by one at a rate of 10 per second. If you don't want any delay between row updates, and you want to make it work when displayArray has a different number of rows that theData, this version of addData should work:.

Learn more. Asked 6 years, 10 months ago. Active 6 years, 10 months ago. Viewed 4k times. I have been struggling with this for a week and my head is about to explode. What I really want is: 1. But since there is no data at start up, no cell is ever visible ui tablew with no cell at displayed at allunless I did this return dataArray. Many thanks in advance, please advise.

Unheilig Unheilig Can you change your question to be more focused?A table view has an editing mode as well as its normal selection mode. When a table view goes into editing mode, it displays the editing and reordering controls associated with its rows.

The editing controls, which are in the left side of the row, allow the user to insert and delete rows in the table view. The editing controls have distinctive appearances:. When a table view enters editing mode and when users click an editing control, the table view sends a series of messages to its data source and delegatebut only if they implement these methods. These methods allow the data source and delegate to refine the appearance and behavior of rows in the table view; the messages also enable them to carry out the deletion or insertion operation.

Even if a table view is not in editing mode, you can insert or delete a number of rows or sections as a group and have those operations animated. The first section below shows you how, when a table is in editing mode, to insert new rows and delete existing rows in a table view in response to user actions.

The second section, Batch Insertion, Deletion, and Reloading of Rows and Sectionsdiscusses how you can insert and delete multiple sections and rows animated as a group. A table view goes into editing mode when it receives a setEditing:animated: message.

Typically but not necessarily the message originates as an action message sent when the user taps an Edit button in the navigation bar. In editing mode, a table view displays any editing and reordering controls that its delegate has assigned to each row.

The delegate assigns the controls as a result of returning the editing style for a row in the tableView:editingStyleForRowAtIndexPath: method. When the table view receives setEditing:animated:it sends the same message to the UITableViewCell object for each visible row. Then it sends a succession of messages to its data source and its delegate if they implement the methods as depicted in the diagram in Figure After resending setEditing:animated: to the cells corresponding to the visible rows, the sequence of messages is as follows:.

Most applications do not need to implement this method. At this point, the table view is fully in editing mode. It displays the insertion or deletion control for each eligible row. The user taps an editing control either the deletion control or the insertion control.

If the user taps a deletion control, a Delete button is displayed on the row. The user then taps that button to confirm the deletion. Although this protocol method is marked as optional, the data source must implement it if it wants to insert or delete a row. It must do two things:.

Update the corresponding data-model array by either deleting the referenced item from the array or adding an item to the array. When the user swipes across a row to display the Delete button for that row, there is a variation in the calling sequence diagrammed in Figure When the user swipes a row to delete it, the table view first checks to see if its data source has implemented the tableView:commitEditingStyle:forRowAtIndexPath: method; if that is so, it sends setEditing:animated: to itself and enters editing mode.

By implementing these methods, the delegate can update the appearance of the table view appropriately. Although you can use an insertion control as the trigger to insert a new row in a table view, an alternative approach is to have an Add or plus sign button in the navigation bar. Tapping the button sends an action message to the view controller, which overlays the table view with a modal view for entering the new item.

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Once the item is entered, the controller adds it to the data-model array and reloads the table. This section gives a guided tour through the parts of a project that work together to set up a table view for editing mode and delete rows from it.

This project uses the navigation controller and view controller architecture to manage its table views. In its loadView method, the custom view controller creates the table view and sets itself to be the data source and delegate.

It also sets the right item of the navigation bar to be the standard Edit button. This button is preconfigured to send setEditing:animated: to the view controller when tapped; it toggles the button title between Edit and Done and the Boolean editing parameter on alternating taps.

In its implementation of the method, as shown in Listingthe view controller invokes the superclass invocation of the method, sends the same message to the table view, and updates the enabled state of the other button in the navigation bar a plus-sign button, for adding items. When its table view enters editing mode, the view controller specifies a deletion control for every row except the last, which has an insertion control.So far we focus on displaying data in the table view. But how do we know when someone taps on the table row?

As explained in the earlier tutorialboth delegates are known as protocol in Objective-C. You have to conform with the requirements defined in these protocols in order to build a UITableView. Each delegate is responsible for a specific role or task to keep the system simple and clean.

Whenever an object needs to perform certain task, it depends on another object to handle it. This is usually known as separation of concern in system design. When you look at the UITableView class, it also applies this design concept. The two delegates are catered for different purpose. There are two ways to access the documentation. Or simply look it up inside Xcode. Both of the methods are used for row selection.

UITableView Missing cell for newly visible row NSInternalInconsistencyException

Usually you make use of this method to prevent selection of a particular cell from taking place. The code is very easy to understand. When a row is selected, the app creates an UIAlertView and shows an alert message.

Try to run the app and this is what the app looks like when you tap a row:. When a row is selected, an alert message is displayed. For now, we just display a generic message when a row is selected. Think about how you can alter the code hint: the indexPath parameter contains the row number of the selected row and display the message like the screenshot shown above. Easy, right?

ios uitableview update row

Before that, let me take a look at the default content of a table cell:. The first line retrieves the selected table cell by using the indexPath.My application loads a set number of rows in the table dependent on the available real estate and I am trying to load in more as the user scrolls past the last row.

At the moment I have the following:. On the simulator the maxLoadRowsOfData is 10, therefore after the 9th row I want to load some more data, which is being fired the launchReload method. However after the tableView. InsertRows is executed I promptly get the following - and the exception is not being caught so I can't get an exception message if someone could assist in catching this so I could get the message which would be more helpful!

Any assistance would be great - at the very least a way to catch the exception to see the message! At 10 in the stackTrace there is a description being passed back and would like to see what it is.

It is important that your model is updated first. The UITableView just displays what is in there. Xamarin Inc.

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This site uses cookies for analytics, personalized content and ads. By continuing to browse this site, you agree to this use. Learn more. Xamarin Menu About What is Xamarin? What is Xamarin. January in Xamarin. FromRowSection newIndex, indexPath. Tagged: ios uitableview. January In there, put a check similar to what you have now in GetCell to see if you have reached the end. Because your table source gets the number of rows from your model it should automatically update now.In our last tutorial we have seen how to create a custom cell in TableView to display our custom contents.

ios uitableview update row

In this tutorial we are going to see how to access the row selection and delete the row from TableView. In our last tutorial we have seen how to create a simple table view and how to create a custom table cell. Just refer our previous tutorial because we are going to continue from there.

It provides swipe to delete gesture that can implemented with single mode override. The table source detects if this method is overridden and automatically enables the swipe-to-delete gesture. If this method is implemented and returns false for some specific rows, or for all rows then the swipe-to-delete gesture will not be available in that cell. Before going to start the code we have to understand that we cannot simply delete data from array, so we have to take a List to perform this operation.

Then we have to also update our TableSource file because we pass string array in its constructor and now we have a List. So in TableSource. Your updated TableSource file will look like this:. Now we are going to user override method of CommitEditingStyle in our TableSource file, here we simply going to remove the data from itemData List and remove TableView row.

We are done with updating and inserting code for the Swipe to delete in our project.

Expandable and Collapsible Sections UITableView (Ep 3)

Try to build and run the project, if everything is ok as I mention then your app will look like this:. Your email address will not be published. Notice: It seems you have Javascript disabled in your Browser. In order to submit a comment to this post, please copy this code and paste it along with your comment: fc1b3c0bdc3fe4dcac1.

Just add this method in TableSource:.

UITableView - update the cells - not a full reload

Show. Count. RemoveAt indexPath. Delete :. Row. Fade. None :. Need mobile app development help? Leave a Reply Cancel reply Your email address will not be published.Adding swipe left or swipe right actions is now pretty simple, so lets just dive right in. To try out these new APIs, a very basic list view was created with some hard coded data. The code for this post can be found here. The keys to adding swipe actions start with new UITableView delegate methods, defined as follows:.

This class is initialized with an array of UIContextualAction classes.

ios uitableview update row

We will use this class to load up the table view with data. Here we introduce the 2 new methods mentioned above. Here, we are using a helper method to instantiate each of the UIContextualAction classes we will need to build our swipe actions.

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The important thing to note here, is that the order of the items in the action array determines the order of the actions displayed when the table view row is swiped. The easiest way to remember is that the first item displays furtherest out, and subsequent items display moving towards the cell. Next, lets take a look at the UIContextualAction. This is where the work happens. The documentation found here. The initializer takes a UIContextualAction. The UIContextualActionHandler gives you access to the UIContextualActionthe view that displayed the action, and a completion handler that you pass a bool indicating whether or not the action was successful.

An example can be found in the contextualToggleFlagAction method shown below:. One more thing of note is that on the UISwipeActionsConfiguration class, you can specify whether the first action in the collection should be performed with a full swipe. This defaults to true. Here is a video of the working app with both leading and trailing swipe actions.

Skip to content. Of course our email struct could have been a class to ease the mutation handling.


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