A UITableView extension that enables cell insertion from the bottom of a table view.

Last update: Dec 15, 2022

Overview

ReverseExtension

UITableView extension that enabled to insert cell from bottom of tableView.

Concept

It is difficult to fill a tableview content from bottom. So, ReverseExtension rotate both of UITableView and UITableViewCell like this images.

If you implement those in ViewController, it will have been fat. So, escaping those implementation to re namespace property, and hiding those complex implementation. In addition, you can rollback to normal behaviour, only removing re namespace.

Example

import UIKit
import ReverseExtension

class ViewController: UIViewController {
    @IBOutlet weak var tableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.re.dataSource = self
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")

        //You can apply reverse effect only set delegate.
        tableView.re.delegate = self
        tableView.re.scrollViewDidReachTop = { scrollView in
            print("scrollViewDidReachTop")
        }
        tableView.re.scrollViewDidReachBottom = { scrollView in
            print("scrollViewDidReachBottom")
        }
    }
}

extension ViewController: UITableViewDelegate {
    //ReverseExtension also supports handling UITableViewDelegate.
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        print("scrollView.contentOffset.y =", scrollView.contentOffset.y)
    }
}

Requirements

Swift 5
Xcode 12 or greater
iOS 10 or greater

Installation

CocoaPods

ReverseExtension is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "ReverseExtension"

Carthage

If you’re using Carthage, simply add ReverseExtension to your Cartfile:

github "marty-suzuki/ReverseExtension"

Make sure to add ReverseExtension.framework to "Linked Frameworks and Libraries" and "copy-frameworks" Build Phases.

Special Thanks

TouchVisualizer (Created by @morizotter)

Author

marty-suzuki, [email protected]

License

ReverseExtension is available under the MIT license. See the LICENSE file for more info.

Comments

Terminating app due to uncaught exception 'NSInternalInconsistencyException'

I am getting this error, after I hit Back in the navigation controller. My ChatViewController (which uses ReverseExtension) is succesfully deiniting as you can see from the logs below, also another observer that I use (ContextWatcher) is deiniting as well.

I put a break point in deinit and the below error occures before the break point. Any ideas?

[00070]:ChatViewController.swift :deinit........................ :10:26:52 ------------------------- [00071]:ChatViewController.swift :deinit........................ :10:26:52 | ViewController deinit | [00072]:ChatViewController.swift :deinit........................ :10:26:52 ------------------------- [00075]:CDContextWatcher.swift :deinit........................ :10:26:52 DEINIT ContextWatcher 2017-04-02 10:26:52.602283 LetsGoApp[401:153893] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'An instance 0x1031e0a00 of class UITableView was deallocated while key value observers were still registered with it. Current observation info: <NSKeyValueObservationInfo 0x1708390e0> ( <NSKeyValueObservance 0x170a5b780: Observer: 0x1701cb8b0, Key path: contentInset, Options: <New: YES, Old: YES, Prior: NO> Context: 0x0, Property: 0x17084d200> )'

opened by ghost 9
origin table is reversed

Excuse me, I have a tableview to show all things, after I install your framework, and use in my target page, until here is fine, but when I back the last page the tableview is reverse.

opened by yfde11 5
Crash in Object-C

UMLOG: error: session_id=0A305CA2267A57BCE3328B677E10407C, context=An instance 0x7fab039b2400 of class UITableView was deallocated while key value observers were still registered with it. Current observation info: <NSKeyValueObservationInfo 0x61000023b420> ( <NSKeyValueObservance 0x61000045e690: Observer: 0x6100001de4b0, Key path: contentInset, Options: <New: YES, Old: YES, Prior: NO> Context: 0x0, Property: 0x608000440d80>

Can you help me with this problem?

opened by jihongboo 4
Crash When Scrolling to the Top

In Xcode 10/Swift 4.2/iOS 12 Simulator, both my app and the included sample app crash if there are tableviewcells on the table and you try to scroll beyond the top of the view.

The issue doesn't seem to appear in Xcode 9/Swift 4.1/iOS 11.

opened by mredig 3
Autocorrect-bubble reversed

I tried something similar a while ago when implementing a messenger-functionality in our app. We came up with the same idea of reverting the tableview and then reverting the cells. So, the cell at the bottom contained a UITextField to enter the text to the other user. A problem we stumbled upon was the autocorrect-bubble: In this example i just added a textfield to the cell to see what happens… if you type in something and autocorrect comes up with some better stuff, the bubble is reversed. We tried to walk through the view-hierarchy to rotate the bubble, but no solution was satisfying... do you have any idea how to take care of this?

opened by senfi 3
Swift 5

Is there any chance to update this library to support swift 5 ? I tried to compile it against swift 5 (after fixing a few renames), but it looks like it always gets the first item from the datasource (using similar setup from the sample project)

opened by alexwibowo 2
The screen turn upside down

I updated to 0.4.5 and found out a bug. The screen(tableview) will always turn upside down then I pop a view controller. This bug only appears on 0.4.5.

opened by jihongboo 2
Xcode 12
Also going to create a Swift 5 PR, but first updated codebase to build Sample with Xcode 12 anyways.👌

[x] Updated TouchVisualizer.

[x] Updated Sample layout to expand nicely under safe-areas.
opened by toshi0383 1
Updates so that 4.2 will work with this extension

Hello @marty-suzuki I made some changes to the ReverseExtension.swift so that it would be compatible with Swift 4.2. They're some minor changes if you wanted to add them to your repository. But no pressure. Great extension, I appreciate it ;)

opened by sunnysidesounds 1

Error in Xcode9 Swift 4

On line 163 in ReverseExtension.swift

            contentInsetObserver?.didChange = { [weak self] _ in
                DispatchQueue.main.async {
                    self?.configureTableViewInsets()
                }
            }

Gives a compile error.

Changing it to:

            contentInsetObserver?.didChange = { [weak self] (_, _) in
                DispatchQueue.main.async {
                    self?.configureTableViewInsets()
                }
            }

Works.

opened by helloniklas 1

fix reversedIndexPath if sections are used

I found an error in the reversedIndexPath method if sections are used. I tested this fix for my own application and it works as expected but if you have a better idea I would be interested to hear about it. The problem is that the number of rows in section was always determined using the section from the given IndexPath and calling the UITableView method numberOfRows(inSection:). However, if I called the methods in my ViewController the reversedIndexPath should have been used. #22

opened by sattler 1
Replace DelegateProxy with concrete forward implementation

fixes: Issues like https://github.com/marty-suzuki/ReverseExtension/issues/23 , https://github.com/marty-suzuki/ReverseExtension/issues/36

I faced this non-reversed index issue with willDisplay delegate.

opened by toshi0383 3
Custom section header view not working.

Hi,

If I use method for custom section header view than header is not presented properly:

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?

Can you provide me instructions what should I do to make this work, thank you.

opened by DavidTomic 3
Scroll Bar showing on left side instead of right side

I have implemented this into my project and everything works great except the scroll bar is showing on the left side instead of the right side. Is there a way to make it show on the right side?

opened by ryandailey100 0

Owner

Taiki Suzuki

AbemaTV / University of Aizu 18th

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