UIAlertController 消息被截断为一行

Question

在我的应用程序中，在呈现 UIAlertController 时，它会将消息截断为一行。如何使其显示以自动换行显示全文。

这是我的代码

let alert = UIAlertController(title: title, message:"Long text"  , 
preferredStyle: UIAlertControllerStyle.alert) 

let okAction = UIAlertAction(title: "OK", style: 
UIAlertActionStyle.default, handler: nil)  

alert.addAction(okAction)

self.present(alert, animated: true, completion: nil)

Answer 1

我发现了问题。我在我的代码中覆盖了 UILabel 类。当我现在删除代码时，它工作正常。

Answer 2

过去几天我也面临同样的问题，但终于找到了解决方案。 我删除了“使用 UIEdgeInsets 填充”代码，它工作正常。

删除下面的代码

extension UILabel {

    public var padding: UIEdgeInsets? {
        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.padding) as? UIEdgeInsets
        }
        set {
            if let newValue = newValue {
                objc_setAssociatedObject(self, &AssociatedKeys.padding, newValue as UIEdgeInsets, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
            }
        }
    }
}

UIAlertviewController。 希望对你有帮助！！！

Answer 3

从 Swift 4 开始，您可以使用多行字符串：https://www.hackingwithswift.com/example-code/language/how-to-create-multi-line-string-literals

例子：

let longString = """
When you write a string that spans multiple
lines make sure you start its content on a
line all of its own, and end it with three
quotes also on a line of their own.
Multi-line strings also let you write "quote marks"
freely inside your strings, which is great!
"""

所以，你的代码是：

let longTextMessage = """
When you write a string that spans multiple
lines make sure you start its content on a
line all of its own, and end it with three
quotes also on a line of their own.
Multi-line strings also let you write "quote marks"
freely inside your strings, which is great!
"""

let alert = UIAlertController(title: title, message:longTextMessage, preferredStyle: UIAlertControllerStyle.alert) 

let okAction = UIAlertAction(title: "OK", style: 
UIAlertActionStyle.default, handler: nil)  

alert.addAction(okAction)

self.present(alert, animated: true, completion: nil)

LE：我使用了您的代码，其中包含一条长短信，例如：

let alert = UIAlertController(title: title, message:"Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text ",
                                      preferredStyle: UIAlertControllerStyle.alert)

        let okAction = UIAlertAction(title: "OK", style:
            UIAlertActionStyle.default, handler: nil)

        alert.addAction(okAction)

        self.present(alert, animated: true, completion: nil)

没有任何东西被截断。还有其他东西在弄乱你的 alertController。

Answer 4

在您的字符串中，您可以使用“\n”手动添加多行

let string = "This is \na string with \nmultiple lines"

应该给你例如一个总共 3 行的字符串。