Ok, me las arreglé para poner en práctica esto mismo y estoy bastante contento con el resultado. Puede arrastrar celdas desde la izquierda (tabla de origen) a la derecha (tabla de destino) y también arrastrar celdas dentro de la tabla de destino para volver a ordenar. Si intenta arrastrar una celda de derecha a izquierda, se reinserta en la misma posición donde comenzó a arrastrar (para que no ocurra nada). La tabla de destino también admite la eliminación de celdas, la tabla fuente no. Así que aquí está el código completo:
UIDropTableViewController.h
#import <UIKit/UIKit.h>
@interface UIDropTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, UIGestureRecognizerDelegate>
{
UINavigationItem* srcTableNavItem;
UINavigationItem* dstTableNavItem;
UITableView* srcTableView;
UITableView* dstTableView;
UITableViewCell* draggedCell;
UIView* dropArea;
NSMutableArray* srcData;
NSMutableArray* dstData;
id draggedData;
BOOL dragFromSource; // used for reodering
NSIndexPath* pathFromDstTable; // used to reinsert data when reodering fails
}
@property (nonatomic, readonly) NSArray* srcData;
@property (nonatomic, readonly) NSArray* dstData;
- (id)initWithFrame:(CGRect)frame SourceData:(NSArray*)sourceData DestinationData:(NSArray*)destinationData;
- (void)setSrcTableTitle:(NSString*)title;
- (void)setDstTableTitle:(NSString*)title;
@end
UIDropTableViewController.m
#import "UIDropTableViewController.h"
#define kCellIdentifier @"DropTableCell"
#define kCellHeight 44
#define kNavBarHeight 30
// forward declaration of private helper methods
@interface UIDropTableViewController()
- (void)setupSourceTableWithFrame:(CGRect)frame;
- (void)setupDestinationTableWithFrame:(CGRect)frame;
- (void)initDraggedCellWithCell:(UITableViewCell*)cell AtPoint:(CGPoint)point;
- (void)startDragging:(UIPanGestureRecognizer *)gestureRecognizer;
- (void)startDraggingFromSrcAtPoint:(CGPoint)point;
- (void)startDraggingFromDstAtPoint:(CGPoint)point;
- (void)doDrag:(UIPanGestureRecognizer *)gestureRecognizer;
- (void)stopDragging:(UIPanGestureRecognizer *)gestureRecognizer;
- (UITableViewCell*)srcTableCellForRowAtIndexPath:(NSIndexPath*)indexPath;
- (UITableViewCell*)dstTableCellForRowAtIndexPath:(NSIndexPath*)indexPath;
@end
@implementation UIDropTableViewController
@synthesize srcData, dstData;
#pragma mark -
#pragma mark Public Methods
- (void)setSrcTableTitle:(NSString*)title
{
srcTableNavItem.title = title;
}
- (void)setDstTableTitle:(NSString*)title
{
dstTableNavItem.title = title;
}
#pragma mark -
#pragma mark UIViewController
- (id)initWithFrame:(CGRect)frame SourceData:(NSArray*)sourceData DestinationData:(NSArray*)destinationData
{
self = [super init];
if (self)
{
self.view.clipsToBounds = YES;
self.view.frame = frame;
int width = frame.size.width;
int height = frame.size.height;
// set up data
srcData = [[NSMutableArray alloc] initWithArray:sourceData];
dstData = [[NSMutableArray alloc] initWithArray:destinationData];
draggedCell = nil;
draggedData = nil;
pathFromDstTable = nil;
// set up views
[self setupSourceTableWithFrame:CGRectMake(0, 0, width/2, height)];
[self setupDestinationTableWithFrame:CGRectMake(width/2, 0, width/2, height)];
UIView* separator = [[UIView alloc] initWithFrame:CGRectMake(width/2, 0, 1, height)];
separator.backgroundColor = [UIColor blackColor];
[self.view addSubview:separator];
[separator release];
// set up gestures
UIPanGestureRecognizer* panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanning:)];
[self.view addGestureRecognizer:panGesture];
[panGesture release];
}
return self;
}
- (void)dealloc
{
[srcTableNavItem release];
[dstTableNavItem release];
[srcTableView release];
[dstTableView release];
[dropArea release];
[srcData release];
[dstData release];
if(draggedCell != nil)
[draggedCell release];
if(draggedData != nil)
[draggedData release];
if(pathFromDstTable != nil)
[pathFromDstTable release];
[super dealloc];
}
- (void)viewWillAppear:(BOOL)animated
{
[srcTableView reloadData];
[dstTableView reloadData];
[UIView animateWithDuration:0.2 animations:^
{
CGRect frame = dstTableView.frame;
frame.size.height = kCellHeight * [dstData count];
dstTableView.frame = frame;
}];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}
#pragma mark -
#pragma mark Helper methods for initialization
- (void)setupSourceTableWithFrame:(CGRect)frame
{
srcTableNavItem = [[UINavigationItem alloc] init];
srcTableNavItem.title = @"Source Table";
CGRect navBarFrame = frame;
navBarFrame.size.height = kNavBarHeight;
UINavigationBar* navigationBar = [[UINavigationBar alloc] initWithFrame:navBarFrame];
[navigationBar pushNavigationItem:srcTableNavItem animated:false];
[navigationBar setTintColor:[UIColor lightGrayColor]];
[self.view addSubview:navigationBar];
[navigationBar release];
CGRect tableFrame = frame;
tableFrame.origin.y = kNavBarHeight;
tableFrame.size.height -= kNavBarHeight;
srcTableView = [[UITableView alloc] initWithFrame:tableFrame];
[srcTableView setDelegate:self];
[srcTableView setDataSource:self];
[self.view addSubview:srcTableView];
}
- (void)setupDestinationTableWithFrame:(CGRect)frame
{
dstTableNavItem = [[UINavigationItem alloc] init];
dstTableNavItem.title = @"Destination Table";
CGRect navBarFrame = frame;
navBarFrame.size.height = kNavBarHeight;
UINavigationBar* navigationBar = [[UINavigationBar alloc] initWithFrame:navBarFrame];
[navigationBar pushNavigationItem:dstTableNavItem animated:false];
[navigationBar setTintColor:[UIColor lightGrayColor]];
[self.view addSubview:navigationBar];
[navigationBar release];
CGRect dropAreaFrame = frame;
dropAreaFrame.origin.y = kNavBarHeight;
dropAreaFrame.size.height -= kNavBarHeight;
dropArea = [[UIView alloc] initWithFrame:dropAreaFrame];
[dropArea setBackgroundColor:[UIColor grayColor]];
[self.view addSubview:dropArea];
CGRect contentFrame = dropAreaFrame;
contentFrame.origin = CGPointMake(0, 0);
UILabel* dropAreaLabel = [[UILabel alloc] initWithFrame:contentFrame];
dropAreaLabel.backgroundColor = [UIColor clearColor];
dropAreaLabel.font = [UIFont boldSystemFontOfSize:12];
dropAreaLabel.textAlignment = UITextAlignmentCenter;
dropAreaLabel.textColor = [UIColor whiteColor];
dropAreaLabel.text = @"Drop items here...";
[dropArea addSubview:dropAreaLabel];
[dropAreaLabel release];
CGRect tableFrame = contentFrame;
tableFrame.size.height = kCellHeight * [dstData count];
dstTableView = [[UITableView alloc] initWithFrame:tableFrame];
[dstTableView setEditing:YES];
[dstTableView setDelegate:self];
[dstTableView setDataSource:self];
[dropArea addSubview:dstTableView];
}
- (void)initDraggedCellWithCell:(UITableViewCell*)cell AtPoint:(CGPoint)point
{
// get rid of old cell, if it wasn't disposed already
if(draggedCell != nil)
{
[draggedCell removeFromSuperview];
[draggedCell release];
draggedCell = nil;
}
CGRect frame = CGRectMake(point.x, point.y, cell.frame.size.width, cell.frame.size.height);
draggedCell = [[UITableViewCell alloc] init];
draggedCell.selectionStyle = UITableViewCellSelectionStyleGray;
draggedCell.textLabel.text = cell.textLabel.text;
draggedCell.textLabel.textColor = cell.textLabel.textColor;
draggedCell.highlighted = YES;
draggedCell.frame = frame;
draggedCell.alpha = 0.8;
[self.view addSubview:draggedCell];
}
#pragma mark -
#pragma mark UIGestureRecognizer
- (void)handlePanning:(UIPanGestureRecognizer *)gestureRecognizer
{
switch ([gestureRecognizer state]) {
case UIGestureRecognizerStateBegan:
[self startDragging:gestureRecognizer];
break;
case UIGestureRecognizerStateChanged:
[self doDrag:gestureRecognizer];
break;
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
case UIGestureRecognizerStateFailed:
[self stopDragging:gestureRecognizer];
break;
default:
break;
}
}
#pragma mark -
#pragma mark Helper methods for dragging
- (void)startDragging:(UIPanGestureRecognizer *)gestureRecognizer
{
CGPoint pointInSrc = [gestureRecognizer locationInView:srcTableView];
CGPoint pointInDst = [gestureRecognizer locationInView:dstTableView];
if([srcTableView pointInside:pointInSrc withEvent:nil])
{
[self startDraggingFromSrcAtPoint:pointInSrc];
dragFromSource = YES;
}
else if([dstTableView pointInside:pointInDst withEvent:nil])
{
[self startDraggingFromDstAtPoint:pointInDst];
dragFromSource = NO;
}
}
- (void)startDraggingFromSrcAtPoint:(CGPoint)point
{
NSIndexPath* indexPath = [srcTableView indexPathForRowAtPoint:point];
UITableViewCell* cell = [srcTableView cellForRowAtIndexPath:indexPath];
if(cell != nil)
{
CGPoint origin = cell.frame.origin;
origin.x += srcTableView.frame.origin.x;
origin.y += srcTableView.frame.origin.y;
[self initDraggedCellWithCell:cell AtPoint:origin];
cell.highlighted = NO;
if(draggedData != nil)
{
[draggedData release];
draggedData = nil;
}
draggedData = [[srcData objectAtIndex:indexPath.row] retain];
}
}
- (void)startDraggingFromDstAtPoint:(CGPoint)point
{
NSIndexPath* indexPath = [dstTableView indexPathForRowAtPoint:point];
UITableViewCell* cell = [dstTableView cellForRowAtIndexPath:indexPath];
if(cell != nil)
{
CGPoint origin = cell.frame.origin;
origin.x += dropArea.frame.origin.x;
origin.y += dropArea.frame.origin.y;
[self initDraggedCellWithCell:cell AtPoint:origin];
cell.highlighted = NO;
if(draggedData != nil)
{
[draggedData release];
draggedData = nil;
}
draggedData = [[dstData objectAtIndex:indexPath.row] retain];
// remove old cell
[dstData removeObjectAtIndex:indexPath.row];
[dstTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationMiddle];
pathFromDstTable = [indexPath retain];
[UIView animateWithDuration:0.2 animations:^
{
CGRect frame = dstTableView.frame;
frame.size.height = kCellHeight * [dstData count];
dstTableView.frame = frame;
}];
}
}
- (void)doDrag:(UIPanGestureRecognizer *)gestureRecognizer
{
if(draggedCell != nil && draggedData != nil)
{
CGPoint translation = [gestureRecognizer translationInView:[draggedCell superview]];
[draggedCell setCenter:CGPointMake([draggedCell center].x + translation.x,
[draggedCell center].y + translation.y)];
[gestureRecognizer setTranslation:CGPointZero inView:[draggedCell superview]];
}
}
- (void)stopDragging:(UIPanGestureRecognizer *)gestureRecognizer
{
if(draggedCell != nil && draggedData != nil)
{
if([gestureRecognizer state] == UIGestureRecognizerStateEnded
&& [dropArea pointInside:[gestureRecognizer locationInView:dropArea] withEvent:nil])
{
NSIndexPath* indexPath = [dstTableView indexPathForRowAtPoint:[gestureRecognizer locationInView:dstTableView]];
if(indexPath != nil)
{
[dstData insertObject:draggedData atIndex:indexPath.row];
[dstTableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationMiddle];
}
else
{
[dstData addObject:draggedData];
[dstTableView reloadData];
}
}
else if(!dragFromSource && pathFromDstTable != nil)
{
// insert cell back where it came from
[dstData insertObject:draggedData atIndex:pathFromDstTable.row];
[dstTableView insertRowsAtIndexPaths:[NSArray arrayWithObject:pathFromDstTable] withRowAnimation:UITableViewRowAnimationMiddle];
[pathFromDstTable release];
pathFromDstTable = nil;
}
[UIView animateWithDuration:0.3 animations:^
{
CGRect frame = dstTableView.frame;
frame.size.height = kCellHeight * [dstData count];
dstTableView.frame = frame;
}];
[draggedCell removeFromSuperview];
[draggedCell release];
draggedCell = nil;
[draggedData release];
draggedData = nil;
}
}
#pragma mark -
#pragma mark UITableViewDataSource
- (BOOL)tableView:(UITableView*)tableView canMoveRowAtIndexPath:(NSIndexPath*)indexPath
{
// disable build in reodering functionality
return NO;
}
- (void)tableView:(UITableView*)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
// enable cell deletion for destination table
if([tableView isEqual:dstTableView] && editingStyle == UITableViewCellEditingStyleDelete)
{
[dstData removeObjectAtIndex:indexPath.row];
[dstTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[UIView animateWithDuration:0.2 animations:^
{
CGRect frame = dstTableView.frame;
frame.size.height = kCellHeight * [dstData count];
dstTableView.frame = frame;
}];
}
}
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
// tell our tables how many rows they will have
int count = 0;
if([tableView isEqual:srcTableView])
{
count = [srcData count];
}
else if([tableView isEqual:dstTableView])
{
count = [dstData count];
}
return count;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return kCellHeight;
}
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
UITableViewCell* result = nil;
if([tableView isEqual:srcTableView])
{
result = [self srcTableCellForRowAtIndexPath:indexPath];
}
else if([tableView isEqual:dstTableView])
{
result = [self dstTableCellForRowAtIndexPath:indexPath];
}
return result;
}
#pragma mark -
#pragma mark Helper methods for table stuff
- (UITableViewCell*)srcTableCellForRowAtIndexPath:(NSIndexPath*)indexPath
{
// tell our source table what kind of cell to use and its title for the given row
UITableViewCell *cell = [srcTableView dequeueReusableCellWithIdentifier:kCellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:kCellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.textColor = [UIColor darkGrayColor];
}
cell.textLabel.text = [[srcData objectAtIndex:indexPath.row] description];
return cell;
}
- (UITableViewCell*)dstTableCellForRowAtIndexPath:(NSIndexPath*)indexPath
{
// tell our destination table what kind of cell to use and its title for the given row
UITableViewCell *cell = [dstTableView dequeueReusableCellWithIdentifier:kCellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:kCellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.textColor = [UIColor darkGrayColor];
}
cell.textLabel.text = [[dstData objectAtIndex:indexPath.row] description];
return cell;
}
@end
Aquí es un ejemplo de cómo usarlo:
NSArray* srcData = [NSArray arrayWithObjects:@"item0", @"item1", @"item2", @"item3", @"item4", nil];
NSArray* dstData = [NSArray arrayWithObjects:@"item5", @"item6", nil];
dropTable = [[UIDropTableViewController alloc] initWithFrame:CGRectMake(100, 100, 600, 500) SourceData:srcData DestinationData:dstData];
[dropTable setSrcTableTitle:@"Bla"];
[dropTable setDstTableTitle:@"Blub"];
[[dropTable.view layer] setBorderColor:[[UIColor darkGrayColor] CGColor]];
[[dropTable.view layer] setBorderWidth:1];
[[dropTable.view layer] setCornerRadius:2];
[self.view addSubview:dropTable.view];
Entonces, después de Ya terminaste de editar, solo lees dropTable.dstData
y sigues usándolo para la noche lo que quieres hacer
En UIDropTableViewController.m
es posible que desee ajustar initDraggedCellWithCell
, srcTableCellForRowAtIndexPath
y dstTableCellForRowAtIndexPath
para sus propias necesidades en cuanto a la representación celular va.
mira esto: https://github.com/Ice3SteveFortune/i3-dragndrop – sf13579