Description

The UITableViewCell's swift extension of UITableViewCellLifecycleExtension (with MDTableViewDelegate) provide lifecycle events for UITableViewCell, just like similar events of UIViewController:

• cellWillAppear
• cellDidAppear
• cellDidLayoutSubviews
• cellDidDisappear

Why

I'm a big fan of UITableView, since it provides the flexibility of organizing contents dynamically. And with more and more animations in the UI, I found it hard to locate my code elegantly.
On the other hand, UIViewController is nice with viewWillAppear, viewDidAppear, viewDidLayoutSubviews, viewWillDisappear and viewDidDisappear etc.
I though I shall make this happen to UITableViewCell.

How to Use

see the sample code

• Include UITableViewCellLifecycleExtension.swift and MDTableViewDelegate.swift into the projects. Subclass MDTableViewDelegate, and put your tableView's dataSource and delegate code in this class. And these events will be triggerred in the cells.
• IMPORTANT Be sure to call super.tableView(tableView, willDisplayCell: cell, forRowAtIndexPath: indexPath) when implementing an override version of tableView:willDisplayCell:forRowAtIndexPath in your subclass of MDTableViewDelegate
• If UITableViewController's cells want to have these events, when impelementing the delegate within the table view controller, please refer to the implementation of UITableViewController+Lifecycle.h/m in the Objective-C version (see below) and MDTableViewDelegate.swift

Objective-C version

UITableViewCell-Lifecycle

The difference between Objective-C version and Swift version is:   
the Objective-C version swizzle method `tableView:willDisplayCell:forRowAtIndexPath:` in all the subclass of `MDTableViewDelegate`, not `MDTableViewDelegate` itself.
By doing this, there is not need to call `super.tableView(tableView, willDisplayCell: cell, forRowAtIndexPath: indexPath)`, and all the hacking details are hidden.

Known Issues

These events won't be triggerred if the whole tableView is going on-screen or off-screen, e.g. when pushing another view controller or poped back from another view controller. (Currently I don't see the need to fix this.)
It only happens when the UITableViewCell is scrolling into or out-of the visible area of the table view.

中文说明

给TableViewCell加上生命周期事件（如cellWillAppear）(下)