nsuserdefaults

问题 Swift 3 iOS 10, Trying to save array with custom objects in NSKeyedArchiver, basically trying to save the table view after the user uses the buttons to switch between sections. I've tried several post to solve the issue but no luck, now I'm trying to do it myself NSCoding and NSKeyedArchiver. Error: Cannot convert value of type '[Blog]' to expected argument type 'NSCoder' Error is in code in Blog.swift, Code that handles NSCoding and my Blog Objects import UIKit class BlogsCoding: NSObject,

问题 I have an app that tracks a user as they drive along. It uses CLLocationManager and each time the didUpdateToLocation is called I save the CLLocation point. A trip of around 25 miles yields somewhere in the neighborhood of 1200 points. As of now I save this array of points to the user defaults for testing. Should I look at CoreData to properly save this information? Or possible just write everything out to a file? My concern is that can NSUserDefaults "max out"? I could potentially have

问题 Here is the code, but for some reason I get nil when I read from Watch. Any idea what am I missing? Writing in iOS Method @IBAction func writeDefaults(_ sender: Any) { UserDefaults(suiteName: "group.testingGroups")!.set(true, forKey: "myKey") } Reading from WatchOS @IBAction func readDefaults() { let readKey = UserDefaults(suiteName: "group.testingGroups")!.bool(forKey: "myKey") print("Key Value: \(readKey)") } I also tried the following when reading but nothing... let readKey = UserDefaults

问题 I have problems to figure out how to save my string of type "RiskEntry" with NSUserDefaults. I already went through some other posts, but somehow I still did not manage to solve this particular issue. Let me explain what the code from below does right now: I get some data from my class CustomCell in the following code snippet. Here I first check with an "identifier" which array to update with the new array value "consequences". It all works fine and the updated array is stored in riskEntry.

问题 I understand that NSUserDefaults data is unencrypted and should not be used to store sensitive information. I'm trying to understand how easily someone could get at that information. This thread shows that it's just a plain file on the iphone filesystem. Will this file be transferred to the user's computer during an iPhone sync (if app sync is enabled)? If so, then it'd be extremely easy for anyone to read information stored in NSUserDefaults 回答1: Yes the file will be synced during a backup

问题 In my application, I have a UIImageView and a UIButton. The UIImageView has a UIPanGestureRecognizer, and can be dragged around the screen. I have written: int defaultBallLocation = ball.center; in my - (IBAction)saveButton and Xcode is saying "Cannot associate CGPoint with int". So, how can I save the ball (UIImageView) position on the screen by pressing "save", then load the saved position by pressing "load" through NSUserDefaults? I have worked with NSUserDefaults before, but only with a

问题 In the 'old' Swift, I used to register my defaults loaded from a .plist file like this... let prefs = NSBundle.mainBundle().pathForResource("UserDefaults", ofType: "plist"); let dict = NSDictionary(contentsOfFile: prefs!); let defaults:NSDictionary! = dict?.valueForKey("defaults") as! NSDictionary; NSUserDefaults.standardUserDefaults().registerDefaults(defaults); NSUserDefaults.standardUserDefaults().synchronize(); Under Swift 1.2, I get the error... Cannot invoke 'registerDefaults' with an

问题 I use NSUserDefaults to save some data locally. But the problem is it doesn't save the data all the times. For instance: While an app is crashing I save the execption related informations using NSUserDefaults - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { NSSetUncaughtExceptionHandler(&onUncaughtException); } void onUncaughtException(NSException* exception) { //save exception related details using NSuserdefaults } 回答1: The

问题 Let's say I have the following enums: enum UserState { case LoggedIn(LoggedInState) case LoggedOut(LoggedOutState) } enum LoggedInState { case Playing case Paused case Stopped } enum LoggedOutState { case Unregistered case Registered } Is there a way to save UserState to UserDefaults ? 回答1: Yes You can use Codable protocol to transform your enum into a representation that can be saved in UserDefaults. This tutorial might give you a kickstart. 来源： https://stackoverflow.com/questions/48348665

问题 What is the proper way to delete rows from UITableView and update array from NSUserDefaults? In the following example I'm reading an array from NSUserDefaults and feeding a UITableView with its content, I'm also allowing the user to delete items in the UITableView what I'm not sure is when to read and write to NSUserDefaults so the table updates as soon as a row is deleted. As you can see I start by reading the array the in the viewDidLoad method and re-saving it in the commitEditingStyle