iOS 使用PageMenu如何设置进去后显示哪一页，急急急！！！

Question

项目中使用了pagemenu，但无法设置进入后显示哪一页，只能通过moveToPage 移动到具体哪一页
_pageMenu = [[CAPSPageMenu alloc] initWithViewControllers:controllerArray

                                                    frame:CGRectMake(0.0, 64.0, self.view.frame.size.width, self.view.frame.size.height)
                                                  options:parameters];
_pageMenu.delegate = self;
_pageMenu.currentPageIndex = 0;
_pageMenu.controllerScrollView.scrollEnabled = YES;

[_pageMenu moveToPage:_currentIndex];

_pageMenu.tap = ^(NSInteger index){
    
};

//设置 _pageMenu.currentPageIndex = 0; 无效