UIMenuController sharedMenuController - uicollectionview的自定义menuitem不显示在ios 7中 [英] UIMenuController sharedMenuController - custom menuitem for uicollectionview do not show in ios 7

问题描述

我正在使用 UIMenuItem 在 UICollectionView 单元格长按中执行自定义操作。
这与iOS 6完美配合，但现在我将我的应用程序转换为iOS 7和Xcode 5，但它不起作用。自定义项目未显示。

I'm using a UIMenuItem to perform a custom action in UICollectionView cell long press. this worked perfectly with iOS 6, but now I am converting my application to iOS 7 and Xcode 5 and it don't work. The custom item do not shown.

UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Unfavorite"
                                                  action:@selector(unFavorite:)];
[[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObject:menuItem]];
[UIMenuController sharedMenuController].menuVisible = YES;

- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender;
{
    //do not show default itens like copy, paste....
    [self becomeFirstResponder];
    return NO;
}


- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
// The selector(s) should match your UIMenuItem selector
    if (action == @selector(unFavorite:)) {
         return YES;
    }
    return NO;
}

- (void)collectionView:(UICollectionView *)collectionView
     performAction:(SEL)action
forItemAtIndexPath:(NSIndexPath *)indexPath
        withSender:(id)sender {

}

 - (BOOL)collectionView:(UICollectionView *)collectionView
 shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {

    myIndexPath = indexPath;
    return YES;
}

推荐答案

我不知道iOS 6，但在iOS 7中它非常简单。您只需要三个标准集合视图委托菜单处理方法，以及单元子类中的操作方法。没有必要与第一响应者或类似的东西一起玩。所以，举例来说（在这个例子中，Copy是一个标准项目，但是我已经添加到菜单中）：

I don't know about iOS 6, but in iOS 7 it's very simple. You just need the three standard collection view delegate menu-handling methods, plus an action method in the cell subclass. There is no need to play with first responder or anything like that. So, for example (in this example, Copy is a standard item but Capital is something I've added to the menu):

// collection view delegate:

- (BOOL)collectionView:(UICollectionView *)collectionView 
        shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
    UIMenuItem* mi = [[UIMenuItem alloc] initWithTitle:@"Capital" 
                      action:NSSelectorFromString(@"capital:")];
    [[UIMenuController sharedMenuController] setMenuItems:@[mi]];
    return YES;
}

- (BOOL)collectionView:(UICollectionView *)collectionView 
        canPerformAction:(SEL)action 
        forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
    return (action == NSSelectorFromString(@"copy:") || 
            action == NSSelectorFromString(@"capital:"));
}

- (void)collectionView:(UICollectionView *)collectionView 
        performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath 
        withSender:(id)sender {
    // in real life, would do something here
    NSString* state = (self.sectionData)[indexPath.section][indexPath.row];
    if (action == NSSelectorFromString(@"copy:"))
        NSLog(@"copying %@", state);
    else if (action == NSSelectorFromString(@"capital:"))
        NSLog(@"fetching the capital of %@", state);
}

// cell subclass:

-(void)capital:(id)sender {
    // find my collection view
    UIView* v = self;
    do {
        v = v.superview;
    } while (![v isKindOfClass:[UICollectionView class]]);
    UICollectionView* cv = (UICollectionView*) v;
    // ask it what index path we are
    NSIndexPath* ip = [cv indexPathForCell:self];
    // talk to its delegate
    if (cv.delegate && 
        [cv.delegate respondsToSelector:
             @selector(collectionView:performAction:forItemAtIndexPath:withSender:)])
        [cv.delegate collectionView:cv performAction:_cmd
             forItemAtIndexPath:ip withSender:sender];
}

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