UITableView moveSection

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And I'm eager to learn this more clearly if someone can explain it better. UITableView is one of the most versatile UIViews in UIKit. Collection view allows us to reconstruct a layout in a way that we'd have several columns so that the whole screen would be moderately covered, giving us more flexibility.

Also in editing mode, if a table-view cell has its property set to true, the data source receives a message. If not implemented, isEqual: is used. And then in viewDidload add the hight constraint to settingsView constraints.

UITableView beginUpdates

UITableView is one of the most versatile UIViews in UIKit. It can be used in so many ways, the mind boggles. It not only can restrict generating UI to only the cells that are shown in an efficient manner, it can also update its UI with animations in a very efficient manner using deleteSections:withRowAnimation:, reloadSections:withRowAnimation:, insertSections:withRowAnimation:, moveSection:toSection:, deleteRowsAtIndexPaths:withRowAnimation:, reloadRowsAtIndexPaths:withRowAnimation:, insertRowsAtIndexPaths:withRowAnimation:, and moveRowAtIndexPath:toIndexPath:. What if you have a REST API that returns a JSON data structure that you use to populate your UITableView? If that data ever changes on a subsequent GET, you have little choice but to perform a reloadData, right? We can tackle this! Say that our data source is an array of companies, with each company containing an array of products. The companies will be the titles of each table view section and the products will be the text in each table view cell. We could do the easy thing and perform a reloadData which would reload the entire table view with a flash. Removal of RIM as a company as well as a all of its products This actually seems fairly straightforward, right? The code calls the deleteRowsAtIndexPaths:withRowAnimation: method after it callsinsertRowsAtIndexPaths:withRowAnimation:. However, this is not the order in which UITableView completes the operations. It defers any insertions of rows or sections until after it has handled the deletions of rows or sections. The table view behaves the same way with reloading methods called inside an update block—the reload takes place with respect to the indexes of rows and sections before the animation block is executed. This behavior happens regardless of the ordering of the insertion, deletion, and reloading method calls. Deletion and reloading operations within an animation block specify which rows and sections in the original table should be removed or reloaded; insertions specify which rows and sections should be added to the resulting table. The index paths used to identify sections and rows follow this model. Inserting or removing an item in a mutable array, on the other hand, may affect the array index used for the successive insertion or removal operation; for example, if you insert an item at a certain index, the indexes of all subsequent items in the array are incremented. Great for hardcoding a single known change, but we want to be dynamic so that when a change occurs we can detect the change and apply the change at once. The high level answer is we need to establish a diff and then apply it to the table view. Now the shrewd will notice a very important piece missing before we can rush into implementing this — how do we identify if any given section or row is different? If not implemented, isEqual: is used. First, if the table view is not actually visible, there is no need to animate and reloadData can be used. Second, if the dataSource of the table view does not conform to the UITableViewUpdatingDataSource protocol, we can also just fallback to calling reloadData. Lastly, the algorithm for updateData can be achieved in O n time so a data set with thousands of cells will update in less than 250ms. See the associated coding example here:.

And then in viewDidload add the hight constraint to settingsView constraints. In the first case, section A is animated moving down over the others, while in uitableview beginupdates example second case the three sections moving up are animated over section A. I guess that passing the UITableViewRowAnimationNone to the reloadRowsAtIndexPaths:withRowAnimation: could print the problem but not sure; still, worth to try. I spent a little too long for comfort thinking about how to force a table to clear itself from the cache and reload itself effectively recalling all those UITableViewDelegate methods I had implemented when I wanted it to display a met data set. Many methods of UITable View take objects as parameters and return values. Launch the app on your device, then go to your home screen. It not only can restrict generating UI to only the cells that are shown in an efficient manner, it can also north its UI with animations in a very efficient manner using deleteSections:withRowAnimation:, reloadSections:withRowAnimation:, insertSections:withRowAnimation:, moveSection:toSection:, uitableview beginupdates example, reloadRowsAtIndexPaths:withRowAnimation:, insertRowsAtIndexPaths:withRowAnimation:, and moveRowAtIndexPath:toIndexPath:.