如何在 UIActionSheet 中添加多行文本

Question

如何在 UIActionSheet swift 中添加带有自定义字体的多行文本。我已经尝试过\n。但这不起作用。这是否可能。

这是我的代码。

    alert.addAction(UIAlertAction(title: "line 1.\n %C line 2,\n %C line", style: .default , handler:{ (UIAlertAction)in
        print("User click Approve button")
    }))

    alert.addAction(UIAlertAction(title: "Edit", style: .default , handler:{ (UIAlertAction)in
        print("User click Edit button")
    }))

    alert.addAction(UIAlertAction(title: "Delete", style: .destructive , handler:{ (UIAlertAction)in
        print("User click Delete button")
    }))

    alert.addAction(UIAlertAction(title: "Dismiss", style: .cancel, handler:{ (UIAlertAction)in
        print("User click Dismiss button")
    }))

    self.present(alert, animated: true, completion: {
        print("completion block")
    })

Answer 1

试试下面的代码。

let optionMenu = UIAlertController(title: "Choose Class", message: "", preferredStyle: .actionSheet)
let course1 = UIAlertAction(title: "Computer Science(1st year) \n Digital Electronics", style: .default)
let course2 = UIAlertAction(title: "Computer Science(2nd year) \n Digital Electronics", style: .default)
let cancel = UIAlertAction(title: "Cancel", style: .cancel)
optionMenu.addAction(course1)
optionMenu.addAction(course2)
optionMenu.addAction(cancel)
self.present(optionMenu, animated: true, completion: nil)

// Setting up the number of lines and doing a word wrapping        
UILabel.appearance(whenContainedInInstancesOf:[UIAlertController.self]).numberOfLines = 2
UILabel.appearance(whenContainedInInstancesOf:[UIAlertController.self]).lineBreakMode = .byWordWrapping

输出

Answer 2

我在 UIAlertAction 中显示了 2 个文本值。 要使用多种字体、颜色和其他属性，我们必须使用attributedText 属性。 我使用了以下代码。

UILabel.appearance(whenContainedInInstancesOf: [UIAlertController.self]).numberOfLines = 0

let actionSheetController = UIAlertController(title: nil, message: "Call", preferredStyle: .actionSheet)
actionSheetController.view.tintColor = UIColor.red

for key in phoneNumbers.keys {
    let phoneNumber = phoneNumbers[key] ?? ""
    let actionTitle = "\(key)\n\(phoneNumber)"
    let phoneNumberAction = UIAlertAction(title: actionTitle, style: .default) { action -> Void in
        self.makeCall(phoneNumber)
    }
    actionSheetController.addAction(phoneNumberAction)

    let attributedText = NSMutableAttributedString(string: actionTitle)

    let range = NSRange(location: key.count, length: attributedText.length - key.count)

    attributedText.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.gray, range: range)

    guard let label = (phoneNumberAction.value(forKey: "__representer")as? NSObject)?.value(forKey: "label") as? UILabel else { return }
    label.attributedText = attributedText
}

let cancelAction = UIAlertAction(title: LOCALSTR("Cancel"), style: .cancel) { action -> Void in

}
actionSheetController.addAction(cancelAction)

present(actionSheetController, animated: true, completion: nil)