Can't use AutoLayout Constraints on UNNotificationContentExtension

Question

I'm trying to add a custom notification in iOS 10 that utilizes the force press rich notifications. I want to programmatically add a view to the center of the view controller that inherits from UNNotificationContentExtension, but all I get is a white screen. The content is added when I give it a frame like this:

import UIKit
import UserNotifications
import UserNotificationsUI

class NotificationViewController: UIViewController, UNNotificationContentExtension {

    override func viewDidLoad() {
        super.viewDidLoad()
        let myView = UIView()
        myView.backgroundColor = UIColor.red
        myView.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
        self.view.addSubview(myView)
    }

    func didReceive(_ notification: UNNotification) {

    }

}

Which looks like this: But when I try using AutoLayout programmatically (with the PureLayout wrapper) using this code:

import UIKit
import UserNotifications
import UserNotificationsUI

class NotificationViewController: UIViewController, UNNotificationContentExtension {

    override func viewDidLoad() {
        super.viewDidLoad()

        let myView = UIView()
        myView.backgroundColor = UIColor.red
        self.view.addSubview(myView)

        myView.autoPinEdge(toSuperviewEdge: .top)
        myView.autoPinEdge(toSuperviewEdge: .left)
        myView.autoMatch(.width, to: .width, of: self.view)
        myView.autoMatch(.height, to: .height, of: self.view)
    }

    func didReceive(_ notification: UNNotification) {

    }

}

The result is this:

What would cause AutoLayout to not work in this view controller? I've tested it with the interface builder as well, so I'm quite confused.

Answer 1

以编程方式查看视图时，必须记住将translatesAutoresizingMaskIntoConstraints设置为false，否则自动布局的行为将不符合您的预期。