UITableView cell左滑显示多个按钮

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)

@property (weak, nonatomic)UITableView *tableView;
@property (strong, nonatomic) NSIndexPath* editingIndexPath;  //当前左滑cell的index，在代理方法中设置

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    
    if (self.editingIndexPath)
    {
        [self configSwipeButtons];
    }
}

- (void)configSwipeButtons
{
    // 获取选项按钮的reference
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"11.0"))
    {
        // iOS 11层级 (Xcode 9编译): UITableView -> UISwipeActionPullView
        for (UIView *subview in self.tableView.subviews)
        {
            if ([subview isKindOfClass:NSClassFromString(@"UISwipeActionPullView")] && [subview.subviews count] >= 2)
            {
                // 和iOS 10的按钮顺序相反
                UIButton *deleteButton = subview.subviews[1];
                UIButton *readButton = subview.subviews[0];
                
                [self configDeleteButton:deleteButton];
                [self configReadButton:readButton];
            }
        }
    }
    else
    {
        // iOS 8-10层级: UITableView -> UITableViewCell -> UITableViewCellDeleteConfirmationView
        UITableViewCell *tableCell = [self.tableView cellForRowAtIndexPath:self.editingIndexPath];
        for (UIView *subview in tableCell.subviews)
        {
            if ([subview isKindOfClass:NSClassFromString(@"UITableViewCellDeleteConfirmationView")] && [subview.subviews count] >= 2)
            {
                UIButton *deleteButton = subview.subviews[0];
                UIButton *readButton = subview.subviews[1];
                
                [self configDeleteButton:deleteButton];
                [self configReadButton:readButton];
                [subview setBackgroundColor:[UIColor colorWithHexString:@"E5E8E8"]];
            }
        }
    }
    
//    [self configDeleteButton:deleteButton];
//    [self configReadButton:readButton];
}

- (NSArray*)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(nonnull NSIndexPath *)indexPath
{
    // delete action
    UITableViewRowAction *deleteAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleNormal title:NSLocalizedString(@"DeleteLabel", @"") handler:^(UITableViewRowAction *action, NSIndexPath *indexPath)
                                          {
                                              [tableView setEditing:NO animated:YES];  // 这句很重要，退出编辑模式，隐藏左滑菜单
//                                              [self removeNotificationAction:index];
                                          }];
    
    // read action
    // 根据cell当前的状态改变选项文字
//    NSInteger index = indexPath.section;
//    BOOL isRead = [[NotificationManager instance] read:index];
//    NSString *readTitle = isRead ? @"Unread" : @"Read";
    NSString *readTitle = @"Unread";
    // 创建action
    UITableViewRowAction *readAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleNormal title:readTitle handler:^(UITableViewRowAction *action, NSIndexPath *indexPath)
                                        {
                                            [tableView setEditing:NO animated:YES];  // 这句很重要，退出编辑模式，隐藏左滑菜单
//                                            [[NotificationManager instance] setRead:!isRead index:index];
                                        }];
    
    return @[deleteAction, readAction];
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    
}

- (void)tableView:(UITableView *)tableView willBeginEditingRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.editingIndexPath = indexPath;
    [self.view setNeedsLayout];   // 触发-(void)viewDidLayoutSubviews
}

- (void)tableView:(UITableView *)tableView didEndEditingRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.editingIndexPath = nil;
}

- (void)configDeleteButton:(UIButton*)deleteButton
{
    if (deleteButton)
    {
        [deleteButton.titleLabel setFont:[UIFont fontWithName:@"SFUIText-Regular" size:12.0]];
        [deleteButton setTitleColor:[UIColor colorWithHexString:@"D0021B"] forState:UIControlStateNormal];
        [deleteButton setImage:[UIImage imageNamed:@"finish.png"] forState:UIControlStateNormal];
        [deleteButton setBackgroundColor:[UIColor colorWithHexString:@"E5E8E8"]];
        // 调整按钮上图片和文字的相对位置（该方法的实现在下面）
        [self centerImageAndTextOnButton:deleteButton];
    }
}

- (void)configReadButton:(UIButton*)readButton
{
    if (readButton)
    {
        [readButton.titleLabel setFont:[UIFont fontWithName:@"SFUIText-Regular" size:12.0]];
        [readButton setTitleColor:[UIColor colorWithHexString:@"4A90E2"] forState:UIControlStateNormal];
        // 根据当前状态选择不同图片
//        BOOL isRead = [[NotificationManager instance] read:self.editingIndexPath.row];
        BOOL isRead = NO;
        UIImage *readButtonImage = [UIImage imageNamed: isRead ? @"finish1.png" : @"finish2.png"];
        [readButton setImage:readButtonImage forState:UIControlStateNormal];
        
        [readButton setBackgroundColor:[UIColor colorWithHexString:@"E5E8E8"]];
        // 调整按钮上图片和文字的相对位置（该方法的实现在下面）
        [self centerImageAndTextOnButton:readButton];
    }
}

- (void)centerImageAndTextOnButton:(UIButton*)button
{
    // this is to center the image and text on button.
    // the space between the image and text
    CGFloat spacing = 35.0;
    
    // lower the text and push it left so it appears centered below the image
    CGSize imageSize = button.imageView.image.size;
    button.titleEdgeInsets = UIEdgeInsetsMake(0.0, - imageSize.width, - (imageSize.height + spacing), 0.0);
    
    // raise the image and push it right so it appears centered above the text
    CGSize titleSize = [button.titleLabel.text sizeWithAttributes:@{NSFontAttributeName: button.titleLabel.font}];
    button.imageEdgeInsets = UIEdgeInsetsMake(-(titleSize.height + spacing), 0.0, 0.0, - titleSize.width);
    
    // increase the content height to avoid clipping
    CGFloat edgeOffset = (titleSize.height - imageSize.height) / 2.0;
    button.contentEdgeInsets = UIEdgeInsetsMake(edgeOffset, 0.0, edgeOffset, 0.0);
    
    // move whole button down, apple placed the button too high in iOS 10
    if (SYSTEM_VERSION_LESS_THAN(@"11.0"))
    {
        CGRect btnFrame = button.frame;
        btnFrame.origin.y = 18;
        button.frame = btnFrame;
    }
}