我有一个UITableViewController。我想在用户触摸单元格时弹出复制/粘贴菜单。我想在“联系人”应用中执行此操作。如何实现此功能。有人可以帮助我。
我试过这段代码，
UIMenuController *theMenu = [UIMenuController sharedMenuController];
[theMenu setTargetRect:CGRectMake(10, 200, 100, 40) inView:[self tableView]];
[theMenu setMenuVisible:YES animated:YES];
但它不起作用。我的问题是，
答案 0 :(得分：7)
如果我没有错误长按联系人中的单元格会出现复制/粘贴菜单？如果是这样，我将使用UILongPressGestureRecognizer类来获取单元格中的长按。
关于
1：传递单元格的矩形并在inView中：传递你的uitableView
2：我觉得没必要
3：仅此而已：
这样的事情应该有用......
- (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];
}
}
注意：上面的代码是脑编译的
希望它有所帮助;）
答案 1 :(得分：2)
对UITableViewCell进行子类化并实现复制功能是个好主意。我建议你看一下CopyableCell类。 Here是GitHub链接。希望它有所帮助。
答案 2 :(得分：2)
我对艾哈迈德的工作做了一些改进。这是结果类：
/*
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
这是* .h文件：
/*
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
这是辅助类头：
#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
实现：
#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
答案 3 :(得分：0)