ios開發之實現長按UITableViewCell彈出UIMenuController

項目中需要這個功能，網上找了下資料，有的說得不是很清楚，走了很多彎路才實現了，下面是實現步驟:

1.給cell添加UILongPressGestureRecognizer和相應處理事件

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

{    

   ..............

   UILongPressGestureRecognizer * longPressGesture =         [[UILongPressGestureRecognizer alloc]initWithTarget:selfaction:@selector(cellLongPress:)];

   [cell addGestureRecognizer:longPressGesture];

   return cell;

}

2.配置和顯示UIMenuController

- (void)cellLongPress UIGestureRecognizer *)recognizer{ 
 

    if (recognizer.state ==
UIGestureRecognizerStateBegan) {

       
CGPoint location = [recognizer
locationInView:self];

       
NSIndexPath * indexPath = [self
indexPathForRowAtPoint:location]; 

        UIMyTableViewCell *cell = (UIMyTableViewCell *)recognizer.view;

　　　　　//這裡把cell做為第一響應(cell預設是無法成為responder,需要重寫canBecomeFirstResponder方法)

        [cell becomeFirstResponder];

        

       
UIMenuItem *itCopy = [[UIMenuItem
alloc] initWithTitle:@"複製"
action:@selector(handleCopyCell:)];

       
UIMenuItem *itDelete = [[UIMenuItem
alloc] initWithTitle:@"刪除"
action:@selector(handleDeleteCell:)];        

        UIMenuController *menu = [UIMenuController
sharedMenuController];

[menu setMenuItems:[NSArray arrayWithObjects:itCopy,
itDelete,  nil]];

        [menu
setTargetRect:cell.frame inView:self];

        [menu setMenuVisible:YES
animated:YES];

        

        [itCopy release];

        [itDelete release];

    }

}

- (void)handleCopyCell:(id)sender{//複製cell

    NSLog(@"handle copy cell");

}

- (void)handleDeleteCell:(id)sender{//刪除cell

    NSLog(@"handle delete cell");

}

3.在自訂的cell裡重寫canBecomeFirstResponder方法，返回yes

//為了讓菜單顯示，目標視圖必須在responder鏈中，很多UIKit視圖預設並無法成為一個responder，因此你需要使這些視圖重載 canBecomeFirstResponder方法，並返回YES

- (BOOL)canBecomeFirstResponder{

    return
YES;

}

經過這幾步，就可以成功顯示了，又在網上看到一篇講這個的外文，分享一下：

http://www.intridea.com/blog/2010/12/22/developers-notes-for-uimenucontroller