Copiar/Pegar funcionalidad en UITableViewController

Question

Tengo un UITableViewController. Quiero mostrar el menú copiar/pegar cuando el usuario toca una celda. Quiero hacer lo mismo que en la aplicación Contactos. Cómo implementar esta funcionalidad Alguien me puede ayudar.

Probé este código,

UIMenuController *theMenu = [UIMenuController sharedMenuController]; 
[theMenu setTargetRect:CGRectMake(10, 200, 100, 40) inView:[self tableView]]; 
[theMenu setMenuVisible:YES animated:YES]; 

Pero no funciona. Mi pregunta es:

1. ¿Qué CGRect tengo que pasar como el parámetro setTargetRect?
2. ¿Debo llamar a SetNeedsDisplayInRect en mi TableViewController?
3. ¿Qué más puede hacer para que esto funcione?

Answer 1

Si no estoy equivocado, aparece el menú Copiar/Pegar cuando presiona una celda en el contacto, ¿verdad? Si es así, usaré la clase UILongPressGestureRecognizer para obtener una pulsación larga en la celda.

respecto

1: pasar el rect de la célula y inView: pasar su UITableView

2: Creo que no es necesario

3: nada más:

Algo así debería funcionar ...

- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

    static NSString *CellIdentifier = @"MyCellIdentifier"; 
    UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) { 
    cell = [[[UITableViewCell alloc] initWithReuseIdentifier:CellIdentifier] autorelease]; 
     cell.accessoryType = UITableViewCellAccessoryNone; 
    cell.indentationWidth = cell.frame.size.height; 

    UILongPressGestureRecognizer *r = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(cellWasLongPressed:)]; 
    [cell addGestureRecognizer:r]; 
    [r release]; 
    } 

    //configure your cell here 
    cell.textLabel.text = [file nameForCell]; 
    return cell; 
} 

- (void)cellWasLongPressed:(UILongPressGestureRecognizer *)recognizer{ 

    if (recognizer.state == UIGestureRecognizerStateRecognized) { 
     //show your UIMenuHere 
     UITableViewCell *cell = (UITableViewCell *)recognizer.view; 
     UIMenuController *theMenu = [UIMenuController sharedMenuController]; 
     [theMenu setTargetRect:cell.frame inView:tableView]; 
     [theMenu setMenuVisible:YES animated:YES]; 
    } 

} 

Nota: Código anterior está compilado cerebro

creo que sirve;)

Answer 2

subclases UITableViewCell e implementar funcionalidad de copia no es una buena idea. Te recomiendo que eches un vistazo a la clase CopyableCell. Here es el enlace de GitHub. Espero eso ayude.

Answer 3

Hice algunas mejoras al trabajo de Ahmet. Aquí clases se generados:

/* 
Copyright 2011 Ahmet Ardal 

Licensed under the Apache License, Version 2.0 (the "License"); 
you may not use this file except in compliance with the License. 
You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0 

Unless required by applicable law or agreed to in writing, software 
distributed under the License is distributed on an "AS IS" BASIS, 
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
See the License for the specific language governing permissions and 
limitations under the License. 
*/ 

/* 
Improved by Yuriy Umanets <yuriy.umanets@gmail.com> 

Changes: 
- added new property customMenus, which is array of NamedAction instances describing names and selector action 
for each of custom menus (not one of those copy, paste, etc). The class using CopyableCell can provide own actions 
and they will be called by CopyableCell. This is implemented with dynamicMethodIMP() and resolveInstanceMethod(); 

- oldStyle field that saves old style of the cell before changing (highlighting) so that when action is taken old 
style is set back to the cell without changing behaviour expected by author; 
- (fix) in touchEnded() one needs to call [super touchEnded] in order to provide correct behaviour. 
*/ 


#import "CopyableCell.h" 
#import "NamedAction.h" 

static const CFTimeInterval kLongPressMinimumDurationSeconds = 0.5; 

@interface CopyableCell(Private) 
- (void) initialize; 
- (void) menuWillHide:(NSNotification *)notification; 
- (void) menuWillShow:(NSNotification *)notification; 
- (void) handleLongPress:(UILongPressGestureRecognizer *)longPressRecognizer; 
@end 

@implementation CopyableCell 

@synthesize data, indexPath, delegate, customMenus; 

- (id) initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier 
{ 
     if (!(self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) 
       return self; 

     [self initialize]; 
     return self; 
} 

- (void) initialize 
{ 
     self.data = nil; 
     self.indexPath = nil; 
     self.delegate = nil; 
     self.customMenus = nil; 
     self.selectionStyle = UITableViewCellSelectionStyleNone; 

     UILongPressGestureRecognizer *recognizer = 
     [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; 
     [recognizer setMinimumPressDuration:kLongPressMinimumDurationSeconds]; 
     [self addGestureRecognizer:recognizer]; 
     [recognizer release]; 
} 

- (void) setSelected:(BOOL)selected animated:(BOOL)animated 
{ 
     [super setSelected:selected animated:animated]; 
} 

- (void) dealloc 
{ 
     [self.customMenus release]; 
     [self.data release]; 
     [self.indexPath release]; 
     [super dealloc]; 
} 

#pragma mark - 
#pragma mark Copy Menu related methods 

- (BOOL) isCustomActionExists:(SEL)sel 
{ 
     if (self.customMenus != nil) { 
       for (int i = 0; i < customMenus.count; i++) { 
         NamedAction *namedItem = [customMenus objectAtIndex:i]; 
         if (sel == namedItem.action) 
           return YES; 
       } 
     } 
     return NO; 
} 

- (BOOL) canPerformAction:(SEL)action withSender:(id)sender 
{ 
     if (self.customMenus != nil) { 
       if ([self isCustomActionExists:action]) 
         return YES; 
     } else { 
       if (action == @selector(copy:)) 
         return YES; 
     } 
     return [super canPerformAction:action withSender:sender]; 
} 

- (void) copyToPastboard:(NSString *)dataText 
{ 
     [[UIPasteboard generalPasteboard] setString:dataText]; 
     [self resignFirstResponder]; 
} 

- (void) copy:(id)sender 
{ 
     if ((self.delegate != nil) && 
      [self.delegate respondsToSelector:@selector(copyableCell:dataForCellAtIndexPath:)]) { 
       NSString *dataText = [self.delegate copyableCell:self dataForCellAtIndexPath:self.indexPath]; 
       [self copyToPastboard:dataText]; 
     } else if (self.data != nil) { 
       [self copyToPastboard:self.data]; 
     } 
} 

- (BOOL) canBecomeFirstResponder 
{ 
     return YES; 
} 

- (BOOL) becomeFirstResponder 
{ 
     return [super becomeFirstResponder]; 
} 

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
     [super touchesEnded:touches withEvent:event]; 
     if ([self isFirstResponder] == NO) 
       return; 

     UIMenuController *menu = [UIMenuController sharedMenuController]; 
     [menu setMenuVisible:NO animated:YES]; 
     [menu update]; 
     [self resignFirstResponder]; 
} 

- (void) menuWillHide:(NSNotification *)notification 
{ 
     if ((self.delegate != nil) && [self.delegate respondsToSelector:@selector(copyableCell:deselectCellAtIndexPath:)]) 
       [self.delegate copyableCell:self deselectCellAtIndexPath:self.indexPath]; 

     self.selectionStyle = oldStyle; 
     [[NSNotificationCenter defaultCenter] removeObserver:self name:UIMenuControllerWillHideMenuNotification object:nil]; 
} 

- (void) menuWillShow:(NSNotification *)notification 
{ 
     oldStyle = self.selectionStyle; 
     self.selectionStyle = UITableViewCellSelectionStyleBlue; 
     if ((self.delegate != nil) && [self.delegate respondsToSelector:@selector(copyableCell:selectCellAtIndexPath:)]) 
       [self.delegate copyableCell:self selectCellAtIndexPath:self.indexPath]; 

     [[NSNotificationCenter defaultCenter] removeObserver:self name:UIMenuControllerWillShowMenuNotification object:nil]; 
     [[NSNotificationCenter defaultCenter] addObserver:self 
               selector:@selector(menuWillHide:) 
                name:UIMenuControllerWillHideMenuNotification 
                object:nil]; 
} 

#pragma mark - 
#pragma mark UILongPressGestureRecognizer Handler Methods 

#include <objc/runtime.h> 

void dynamicMethodIMP(id self, SEL sel) { 
     if ([self isCustomActionExists:sel]) 
       [((CopyableCell *)self).delegate performSelector:sel withObject:self withObject:nil]; 
} 

+ (BOOL) resolveInstanceMethod:(SEL)sel { 
     class_addMethod([self class], sel, (IMP)dynamicMethodIMP, "v@:"); 
     return YES; 
} 

- (void) handleLongPress:(UILongPressGestureRecognizer *)longPressRecognizer 
{ 
     if (longPressRecognizer.state != UIGestureRecognizerStateBegan) 
       return; 

     if ([self becomeFirstResponder] == NO) 
       return; 

     UIMenuController *menu = [UIMenuController sharedMenuController]; 
     [menu setTargetRect:self.bounds inView:self]; 

     NSMutableArray *menuItems = nil; 

     if (self.customMenus != nil && customMenus.count > 0) { 
       menuItems = [[[NSMutableArray alloc] init] autorelease]; 
       for (int i = 0; i < customMenus.count; i++) { 
         NamedAction *namedItem = [customMenus objectAtIndex:i]; 
         UIMenuItem *emailItem = [[UIMenuItem alloc] initWithTitle:namedItem.name 
                      action:namedItem.action]; 
         [menuItems addObject:[emailItem autorelease]]; 
       } 
     } 
     menu.menuItems = menuItems; 

     [[NSNotificationCenter defaultCenter] addObserver:self 
               selector:@selector(menuWillShow:) 
                name:UIMenuControllerWillShowMenuNotification 
                object:nil]; 
     [menu setMenuVisible:YES animated:YES]; 
} 

@end 

aquí es * archivo .h:

/* 
Copyright 2011 Ahmet Ardal 

Licensed under the Apache License, Version 2.0 (the "License"); 
you may not use this file except in compliance with the License. 
You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0 

Unless required by applicable law or agreed to in writing, software 
distributed under the License is distributed on an "AS IS" BASIS, 
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
See the License for the specific language governing permissions and 
limitations under the License. 
*/ 


#import <UIKit/UIKit.h> 

@protocol CopyableCellDelegate; 

@interface CopyableCell: UITableViewCell 
{ 
     NSString *data; 
     NSArray *customMenus; 
     NSIndexPath *indexPath; 
     UITableViewCellSelectionStyle oldStyle; 
} 

@property (nonatomic, retain) NSString *data; 
@property (nonatomic, retain) NSArray *customMenus; 
@property (nonatomic, retain) NSIndexPath *indexPath; 
@property (nonatomic, assign) id<CopyableCellDelegate> delegate; 

- (void) copyToPastboard:(NSString *)dataText; 

@end 

@protocol CopyableCellDelegate<NSObject> 
@required 
- (void) copyableCell:(CopyableCell *)cell selectCellAtIndexPath:(NSIndexPath *)indexPath; 
- (void) copyableCell:(CopyableCell *)cell deselectCellAtIndexPath:(NSIndexPath *)indexPath; 

@optional 
- (NSString *) copyableCell:(CopyableCell *)cell dataForCellAtIndexPath:(NSIndexPath *)indexPath; 
@end 

aquí es encabezado clase de ayuda:

#import <Foundation/Foundation.h> 

@interface NamedAction : NSObject { 
     NSString *name; 
     SEL action; 
} 

@property (nonatomic, retain) NSString *name; 
@property (nonatomic, assign) SEL action; 

- (id)initWithName:(NSString *)_name action:(SEL)_action; 

@end 

Implementación:

#import "NamedAction.h" 

@implementation NamedAction 

@synthesize name, action; 

- (id)initWithName:(NSString *)_name action:(SEL)_action 
{ 
     if (self = [super init]) { 
       self.name = _name; 
       self.action = _action; 
     } 
     return self; 
} 

- (void)dealloc { 
     self.name = NULL; 
     self.action = NULL; 
     [super dealloc]; 
} 

@end 

Answer 4

Tener una mira esta forma simple de hacer esto, es jus t toma menos de 10 líneas de código http://notesoncocoa.wordpress.com/2012/03/22/enabling-the-copy-menu-on-a-uitableviewcell/