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Recreating the buttonless interaction pattern found in Clear for iPhone app

README.md

JTGestureBasedTableView

An iOS objective-c library template to recreate the gesture based interaction found from Clear for iPhone app.

This project is aimed to be a truely flexible solution, but currently it's still in development stage and missing a few features.

The library now requires iOS 5.0 with ARC, please use -fobjc-arc compiler flag to add support for non-ARC projects.

Known Issues

It has been developed under iOS 4.3 and 5.0 devices, sample code has been built using ARC (not quite properly). I am still studying to have a proper refactor on my code for a real ARC adoption. There's currently one known issues related to running on non-arc enviornment (e.g. refs #4). Please use -fobjc-arc per source file complier flag for compiling on non-ARC enviroment.

Abstract

Clear for iPhone app has showed us so much we can do with a buttonless interface, and I am trying to reveal the technique behind the gesture based interaction, hopefully can heavy-lifted all of us whom trying to achieve the same.

Demo

Features

It only supports few features at the moment.

  • Pull down to add cell
  • Pinch to create cell
  • Panning on cell gesture
  • Long hold to reorder cell
  • Pull to return to List (Thanks SungDong Kim for making this happen)

10 Jan 2013 Update:

  • Better pinch animation and iPhone 5 screen support (Big thanks for Lukas Foldyna for refactor and polishing!)

How To Use It

Installation

Include all header and implementation files in JTGestureBasedTabeView/ into your project, and also links the QuartzCore framework to your target.

Setting up your UITableView for your viewController

#import "JTTableViewGestureRecognizer.h"

@interface ViewController () <JTTableViewGestureAddingRowDelegate, JTTableViewGestureEditingRowDelegate>
@property (nonatomic, strong) NSMutableArray *rows;
@property (nonatomic, strong) JTTableViewGestureRecognizer *tableViewRecognizer;
@end

@implementation ViewController
@synthesize tableViewRecognizer;

- (void)viewDidload {
    /*
    :
    */

    // In our examples, we setup self.rows as datasource
    self.rows = ...;

    // Setup your tableView.delegate and tableView.datasource,
    // then enable gesture recognition in one line.
    self.tableViewRecognizer = [self.tableView enableGestureTableViewWithDelegate:self];
}

Enabling adding cell gestures

// Conform to JTTableViewGestureAddingRowDelegate to enable features
// - drag down to add cell
// - pinch to add cell
@protocol JTTableViewGestureAddingRowDelegate <NSObject>

- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer needsAddRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer needsCommitRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer needsDiscardRowAtIndexPath:(NSIndexPath *)indexPath;

@optional

- (NSIndexPath *)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer willCreateCellAtIndexPath:(NSIndexPath *)indexPath;
- (CGFloat)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer heightForCommittingRowAtIndexPath:(NSIndexPath *)indexPath;

@end

Enabling editing cell gestures

// Conform to JTTableViewGestureEditingRowDelegate to enable features
// - swipe to edit cell
@protocol JTTableViewGestureEditingRowDelegate <NSObject>

// Panning (required)
- (BOOL)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer canEditRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer didEnterEditingState:(JTTableViewCellEditingState)state forRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer commitEditingState:(JTTableViewCellEditingState)state forRowAtIndexPath:(NSIndexPath *)indexPath;

@optional

- (CGFloat)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer lengthForCommitEditingRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer didChangeContentViewTranslation:(CGPoint)translation forRowAtIndexPath:(NSIndexPath *)indexPath;

@end

Enabling reorder cell gestures

// Conform to JTTableViewGestureMoveRowDelegate to enable features
// - long press to reorder cell
@protocol JTTableViewGestureMoveRowDelegate <NSObject>

- (BOOL)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer canMoveRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer needsCreatePlaceholderForRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer needsMoveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath;
- (void)gestureRecognizer:(JTTableViewGestureRecognizer *)gestureRecognizer needsReplacePlaceholderForRowAtIndexPath:(NSIndexPath *)indexPath;

@end

You choose what to enable

You can pick what gestures to be enabled by conforming to the appropriate protocols. Don't forget to look at JTGestureBasedTableViewDemo/ViewController.m for a complete working usage.

License

This project is under MIT License, please feel free to contribute and use it.

James

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