通过NSNotificationCenter更改被选中的背景色

最新推荐文章于 2025-07-14 15:33:18 发布

最新推荐文章于 2025-07-14 15:33:18 发布 · 133 阅读

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本文介绍如何使用NSNotificationCenter来监听iOS中的UIMenu显示和隐藏事件，并在事件触发时改变UITableViewCell的选择样式。

1，通过NSNotificationCenter注册监听事件

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

2，当UIMenu 显示的时候调用以下方法

- (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

- (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];
}