swift2 UIAlertcontroller设置属性化消息

5cg8jx4n  于 2022-11-23  发布在  Swift
关注(0)|答案(3)|浏览(312)

如何在UIAlertcontroller中将属性化文本设置为消息。我的代码如下所示,但它会使应用程序崩溃。

// create Attributed text

let myAttribute = [NSForegroundColorAttributeName: UIColor(red:122.0/255, green:125.0/255, blue:131.0/255, alpha:1.0),NSFontAttributeName: Constant.flinntRegularFont(15)]
let myAttribute2 = [NSForegroundColorAttributeName: UIColor.blackColor(),NSFontAttributeName: Constant.flinntMediumFont(15)]

let myString = NSMutableAttributedString(string: "You have been unsubscribed from ", attributes: myAttribute)
let myString2 = NSMutableAttributedString(string: self.course.course_name, attributes: myAttribute2)
let myString3 = NSMutableAttributedString(string: "\n\nYour refund will be initiated within one week.", attributes: myAttribute)
let myString4 = NSMutableAttributedString(string: "\n\nFor any help call us on", attributes: myAttribute)
let myString5 = NSMutableAttributedString(string: " 079-4014 9800", attributes: myAttribute2)
let myString6 = NSMutableAttributedString(string: " between 9:30 am to 6:30 pm on Monday to Saturday.\n\nWe will be always here with great deals to share.", attributes: myAttribute)

myString.appendAttributedString(myString2)
myString.appendAttributedString(myString3)
myString.appendAttributedString(myString4)
myString.appendAttributedString(myString5)
myString.appendAttributedString(myString6)

当前UIAlertcontroller代码

let alert = UIAlertController(title: "", message: "Select course", preferredStyle: UIAlertControllerStyle.Alert)
    alert.setValue(myAttribute, forKey: "attributedMessage") // this line make a crash.

    alert.addAction(UIAlertAction(title: "OK", style: .Cancel, handler: { (action) in
        self.delegate?.courseRefundViewControllerCoursrRefunded?(self)
        self.navigationController?.popViewControllerAnimated(true)
    }))
self.presentViewController(alert, animated: true, completion: nil)
  • 谢谢-谢谢

kuarbcqp

kuarbcqp1#

由于DataType不匹配,您的应用程序正在崩溃。
alert.setValue(<value>, forKey: "attributedMessage")
这里的<value>必须是NSMutableAttributedString的一个示例。
但是您传递的是myAttribute,即Dictionary
它正在尝试调用length方法,但在Dictionary上找不到,这就是应用程序崩溃的原因。
试试看:

alert.setValue(myString, forKey: "attributedMessage")
wf82jlnq

wf82jlnq2#

作为私有API的替代,您可以使用https://github.com/AntonPoltoratskyi/NativeUI
pod 'NativeUI/Alert', '~> 1.0'
它是一个从头开始实现的自定义视图控制器,看起来与本机UIAlertController完全相同。
您可以传递StringNSAttributedString或自定义内容视图。

let viewModel = Alert(
    title: "Your Title",
    message: nil,
    contentView: customView,
    actions: [cancelAction, confirmAction]
)
let alert = AlertViewController(viewModel: viewModel)
present(alert, animated: true)
798qvoo8

798qvoo83#

这里的答案在iOS 15中是可以接受的,但是如果苹果改变了他们的私有api,它会毫无预警地崩溃。讽刺的是,历史上,当他们公开这种api时,它会改变和破坏这样的东西。下面是一个安全使用私有api的方法:

if
    let property = class_getProperty(type(of: alert), "attributedMessage"),
    let type = property_copyAttributeValue(property, "T"),
    String(cString: type) == #"@"NSAttributedString""#
{
    alert.setValue(myString, forKey: "attributedMessage")
} else {
    alert.message = myString.string
}

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