通过NSNotificationCenter更改被选中的背景色

1，通过NSNotificationCenter注册监听事件

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[[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(menuWillShow:)                                                 name:UIMenuControllerWillShowMenuNotification                                               object:nil];

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2，当UIMenu 显示的时候调用以下方法

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- (void) menuWillShow:(NSNotification *)notification{    self.selectionStyle = UITableViewCellSelectionStyleBlue;    if ((self.delegate != nil) && [self.delegate respondsToSelector:@selector(emailableCell:selectCellAtIndexPath:)]) {        [self.delegate emailableCell:self selectCellAtIndexPath:self.indexPath];    }    [[NSNotificationCenter defaultCenter] removeObserver:self                                                    name:UIMenuControllerWillShowMenuNotification                                                  object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(menuWillHide:)                                                 name:UIMenuControllerWillHideMenuNotification                                               object:nil];}

3，当UIMenu 消失的时候调用以下方法

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- (void) menuWillHide:(NSNotification *)notification{    if ((self.delegate != nil) && [self.delegate respondsToSelector:@selector(emailableCell:deselectCellAtIndexPath:)]) {        [self.delegate emailableCell:self deselectCellAtIndexPath:self.indexPath];    }    self.selectionStyle = UITableViewCellSelectionStyleNone;    [[NSNotificationCenter defaultCenter] removeObserver:self                                                    name:UIMenuControllerWillHideMenuNotification                                                  object:nil];}