UIAlertcontroller set attributed messages

问题

How we can set Attributed text in UIAlertcontroller as message. My try code As bellow, but it will crash the app.

// 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)

Present UIAlertcontroller Code

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)

Thanks.

回答1:

You app is crashing because of DataType mismatch.

alert.setValue(<value>, forKey: "attributedMessage")

Here <value> must be an instance of NSMutableAttributedString.

But you are passing myAttribute Which is Dictionary.

It is trying ta call length method but it is not found on Dictionary thats why app is crashing.

Try this:

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

来源：https://stackoverflow.com/questions/44130347/uialertcontroller-set-attributed-messages