Doppelganger

Array diffs as collection view wants it

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0

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660

Maintenance

Last Commit

6yrs ago

Contributors

2

Package

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0

License

MIT

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Readme

Doppelganger

Build Status Version License Platform

TL;DR;

bad ux good ux
Bad UX Good UX1

1: Slowed down intentionally to demonstrate the awesomeness

Problems it solves

  • Calculating mutations is too hard and you're just calling reloadData on your collection or table view?
  • Users, confused where did that row disappear?
  • Rows, jumping out of nowhere?
  • Lost scroll position?

Doppelganger is here to help!

Usage

NSArray *oldDataSource = self.dataSource;
self.dataSource = [self _updatedDataSource];
NSArray *diffs = [WMLArrayDiffUtility diffForCurrentArray:self.dataSource
                                            previousArray:oldDataSource];
[self.tableView wml_applyBatchChangesForRows:diffs
                                   inSection:0
                            withRowAnimation:UITableViewRowAnimationRight];

Implementation details

  • Currently, doppelganger supports only array of unique elements, e.g. if you have duplicated elements in your array, result is unpredictable.
  • If you are using custom classes, make sure that it implements correctly isEqual: and hash methods: http://nshipster.com/equality/

TODOs

  • Improve on O(n2) when calculating moved elements.
  • Abstract API from NSArray.
  • Your issue / pull request.

Installation

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

pod "Doppelganger"

Author

Sash Zats, sash@zats.io

License

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

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