收到应用程序委托(delegate)后,我传递了一个静态字符串并使用 set needs Layout 刷新了 movieDetailsViewController,函数和代码正常工作,但更改没有反射(reflect)在 View 中。
AppDelegate:-
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let movieDetailsVC = storyboard.instantiateViewController(withIdentifier: "MovieDetailsViewController") as! MovieDetailsViewController
if (rootViewController?.isKind(of: MovieDetailsViewController.self))!
{
if notificationContentType == 1
{
movieDetailsVC.FROMPAGE = "FROMAPPDELEGATE"
movieDetailsVC.view.setNeedsDisplay()
}
}
View Controller :-
override func viewDidLoad()
{
super.viewDidLoad()
let appDelegate: AppDelegate? = UIApplication.shared.delegate as? AppDelegate
appDelegate?.read()
if FROMPAGE == "FROMAPPDELEGATE"
{
// self.updateUI()
print("Function is Called")
//print(self.view.frame)
//self.view.setNeedsDisplay()
let appDelegate: AppDelegate? = UIApplication.shared.delegate as? AppDelegate
appDelegate?.read()
var currentreleaseId : Int!
var currentrentalType : Int!
currentreleaseId = resultDictionaryFromFCM.value(forKey: "releaseId") as? Int
let convertedId = String(currentreleaseId)
currentrentalType = resultDictionaryFromFCM.value(forKey: "rentalType") as? Int
let elapsedTime = resultDictionaryFromFCM.value(forKey: "elapsedTime") as? Float
if convertedId == ApiClassStruct.RELEASEID
{
let movieStartDate = resultDictionaryFromFCM.value(forKey: "clientStartTime") as? Double
defaults.set(movieStartDate, forKey: "MOVIE_START_DATE")
if currentrentalType == 1
{
defaults.set("true", forKey: "isStillPlaying")
self.tableViewOutlet.isHidden = true
self.seekBarOutlet.isHidden = false
let maximumDuration = defaults.integer(forKey: "MAXIMUMDURATION")
self.seekBarMaximumDurationLabelOutlet.text = self.convertTime(miliseconds: maximumDuration)
self.seekBarOutlet.maximumValue = Float(maximumDuration)
let currentDate = NSDate()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd, HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "IST") as TimeZone!
let date = dateFormatter.date(from: dateFormatter.string(from: currentDate as Date))
let currentDATE = date!.timeIntervalSince1970 * 1000
let movieStartDate = defaults.value(forKey: "MOVIE_START_DATE") as? Double
let difference = currentDATE - movieStartDate!
self.seekBarOutlet.setValue(Float(difference), animated: true)
let selectedValue = "\(Int(self.seekBarOutlet.value))"
let convertedValue = self.convertTime(miliseconds: Int(selectedValue)!)
self.seekBarMinimumDurationLabelOutlet.text = convertedValue
self.myTimer = Timer.scheduledTimer(timeInterval:1, target: self, selector: #selector(self.updateSlider), userInfo: nil, repeats: true)
print("Play condition ended")
}
}
但是变化没有反射(reflect)出来,长期卡在这个issue上。
最佳答案
let movieDetailsVC = storyboard.instantiateViewController(withIdentifier: "MovieDetailsViewController") as! MovieDetailsViewController
创建 MovieDetailsViewController
的新实例,并对其进行修改。如果您不提供该实例,则不会看到任何更改。如果您已经呈现了 MovieDetailsViewController
实例,则呈现的实例将不受其影响。
我建议使用通知来通知 MovieDetailsViewController
更新其 UI。
例如,在应用委托(delegate)中使用它来创建和发布新通知:
NotificationCenter.default.post(name: NSNotification.Name("movieDetailsUpdateNotif"),
object: self, userInfo: nil)
然后在 MovieDetailsViewController.viewDidLoad
中注册以收听这些通知:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self,
selector: #selector(receiveNotification(notification:)),
name: NSNotification.Name("movieDetailsUpdateNotif"),
object: nil)
}
要清理它,请在 deinit
中取消注册(只是为了表现得很好):
deinit {
NotificationCenter.default.removeObserver(self)
}
最后,实现MovieDetailsViewController.receiveNotification(notification:)
来处理通知:
@objc fileprivate func receiveNotification(notification: NSNotification) {
// update UI here, e.g. hide things, show other, etc.
// this will be called when AppDelegate creates a and posts that notification
}
关于ios - 即使在使用 view.setNeedsDisplay() 刷新 View 后,.isHidden 属性也不会反射(reflect)对 View 的更改,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49689127/