Ios QLViewController导航栏-如何将pageCount更改为字符串

QLPreviewController导航栏标题显示当前页码，如第2页，共6页，但我想将此标题更改为任何字符串，如当前文件名。

尝试此操作

        let lblNavTitle = UILabel(frame: CGRect(x: 60, y: 10, width: view.frame.size.width-110, height: 20))
        lblNavTitle?.textAlignment = .center
        lblNavTitle?.lineBreakMode = .byTruncatingMiddle
        lblNavTitle?.text = "File Name"
        navigationItem.titleView = lblNavTitle

或

只需将title属性设置为

self.title = "File Name"

也许对你有用