ios - 如何在 ios swift 中重新加载 TableView 的可见单元格

Question

我正在尝试在单元格加载数据后更改字体大小。单击选项卡栏的图标时，我会显示一个 alertcontroller 操作表。单击其中一项操作后，我想更改单元格中标签的字体大小。

我使用的代码如下:

 //Two global variables,retaining size of each labels
 var fontSizeWord = 20.0
 var fontSizeMeaning = 12.0

 func changeFont(){
        let optionMenu = UIAlertController(title: nil, message: "Change Font", preferredStyle: .actionSheet)
        optionMenu.view.tintColor = UIColor(red: 179/256, green: 180/256, blue: 255/256, alpha: 1.0)
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
        let smallfont = UIAlertAction(title: "Small", style: .default) { (UIAlertAction) in
            self.fontSizeMeaning = 12
            self.fontSizeWord = 20
            self.reloadData()
        }
        let mediumfont = UIAlertAction(title: "Medium", style: .default) { (UIAlertAction) in
            self.fontSizeMeaning = 15
            self.fontSizeWord = 23
            self.reloadData()
        }
        let largefont = UIAlertAction(title: "Large", style: .default) { (UIAlertAction) in
            self.fontSizeMeaning = 18
            self.fontSizeWord = 26
            self.reloadData()
        }
        let extraLarge = UIAlertAction(title: "Extra Large", style: .default) { (UIAlertAction) in
            self.fontSizeMeaning = 21
            self.fontSizeWord = 29
            self.reloadData()
        }
        optionMenu.addAction(cancelAction)
        optionMenu.addAction(smallfont)
        optionMenu.addAction(mediumfont)
        optionMenu.addAction(largefont)
        optionMenu.addAction(extraLarge)
        self.present(optionMenu, animated: true, completion: nil)
    }


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell:SearchTableViewCell = self.searchTableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier) as! SearchTableViewCell
        cell.wordLbl.font = cell.wordLbl.font.withSize(CGFloat(fontSizeWord))
        cell.meaningLbl.font = cell.meaningLbl.font.withSize(CGFloat(fontSizeMeaning))
        return cell
    }

我的问题是可见单元格的字体只有在我滚动一点后才会改变。我如何修复它以在触发 uiactionsheet 的操作时更改。

Answer 1

试试这个片段

self.searchTableView.reloadRows(at: self.searchTableView.indexPathsForVisibleRows!, with: .automatic)