Instagram/IGListKit

Expose UICollectionViewDataSource methods `indexTitlesForCollectionView:` and `indexPathForIndexTitle:atIndex:`

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#1140 opened on Mar 28, 2018

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 (6 comments) (9 reactions) (1 assignee)Objective-C (13,063 stars) (1,540 forks)batch import
enhancementhelp wanted

Description

New issue checklist

General information

  • IGListKit version: All
  • iOS version(s): All
  • CocoaPods/Carthage version: N/A
  • Xcode version: N/A
  • Devices/Simulators affected: N/A
  • Reproducible in the demo project? (Yes/No): N/A
  • Related issues: N/A

Debug information

# Please include debug logs using the following lldb command:
po [IGListDebugger dump]

Hello! I would like to propose a feature to expose the optional methods on UICollectionViewDataSource - indexTitlesForCollectionView: and indexPathForIndexTitle:atIndex:

These methods are used to implement what I would call the 'fast-jump scroll bar' on collection / table views. I'm not sure what it's actually called but a good example of this can be found on the right side of the contacts tab of the iOS contacts app.

Open to any suggestions on the best way to do this, or potential workarounds! Thanks.

Contributor guide

Tech stack
objective c
Domain
mobile
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Objective CiOS UICollectionViewIGListKit basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55
Research direction
Review IGListAdapter's data source protocol to see how current UICollectionViewDataSource methods are exposed. Examine the issue comments for suggestions on the best approach. Implement the two methods in IGListAdapter and ensure they are forwarded to the appropriate delegate. Add documentation and possibly a demo.