So I'm a bit dismayed that Apple has replaced a transparent, easy-to-handle NSUInteger with an HKQueryAnchor but has not provided an easy way to persist that HKQueryAnchor. Has anyone found a good way to do this with NSUserDefaults? The only persistence method I have seen is an archiver to a local file, but my app persists everything in NSUserDefaults, and I'd like to keep it that way if possible. Is there a reliable way to store an HKQueryAnchor this way?
You can convert it to NSData using NSKeyedArchiver and store that in the user defaults.
To store:
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:anchor];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:#"AnchorData"];
To retrieve:
NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:#"AnchorData"];
HKQueryAnchor *anchor = [NSKeyedUnarchiver unarchiveObjectWithData:data];
Related
While setting object to NSUserDefaults my App is crashing Randomly in iOS 12.Below is my code where the crash occurs
shared2 = [[NSUserDefaults alloc]initWithSuiteName:#"group.AppName"];
NSData *datashare = [NSKeyedArchiver archivedDataWithRootObject:_sharedData];
[shared2 setObject:datashare forKey:#"dicForToday"];
Not getting any crash logs as it happens randomly
Frequency of this crash is much more on iOS 12.
Normally you can use this method for save data
Post Method:
[[NSUserDefaults standardUserDefaults] setObject:object forKey:#"somename"];
Get Method:
NSMutableDictionary *dicCover = [[NSUserDefaults standardUserDefaults] valueForKey:#"somename"];
some time ,dictionary or array or not formatting right way we can use to achive your data like this to use NSUserdefault
Use Achive:
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arrayUsers];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:#"somename"];
To get:
NSData *usersData = [[NSUserDefaults standardUserDefaults] valueForKey:#"somename"];
NSMutableArray *redirectionDic = [NSKeyedUnarchiver unarchiveObjectWithData:usersData];
NSUserDefaults *myDefaults = [[NSUserDefaults alloc]
initWithSuiteName:keyChainGroup];
[myDefaults setObject:userInfo forKey:key];
Try this
My application saving NSData (contains bookmarked file reference) list to NSUserDefaults in somewhat following way, at any point of application process:
NSMutableArray *bookmarkedURLs = [[NSMutableArray alloc] init];
[bookmarkedURLs addObject:bookmark]; // 'bookmark' is a NSData object
[[NSUserDefaults standardUserDefaults] setObject:bookmarkedURLs forKey:#"AppBookmarks"];
[[NSUserDefaults standardUserDefaults] synchronize];
When application starts I checked through NSUserDefaults to populate saved NSData list:
bookmarkedURLs = [[[NSUserDefaults standardUserDefaults] objectForKey:#"AppBookmarks"] mutableCopy];
if (bookmarkedURLs.count == 0)
{
bookmarkedURLs = [[NSMutableArray alloc] init];
NSLog(#"INITIALIZED");
}
else
{
NSLog(#"STORES NSDATA LIST");
....
}
The problem I faced I can order in following steps:
There is no saved NSUserDefaults data by 'AppBookmarks' key
Save a NSData to NSUserDefaults by 'AppBookmarks' key
Restarts application
Application tries to populate a NSMutableArray from NSUserDefaults' 'AppBookmarks' key but always found 0 records
I save again a new NSData to 'AppBookmarks' key
Restarts application
Application tries to populate NSMutableArray from 'AppBookmarks' and this time it found saved record(s).
Any restart of application or new NSData addition to 'AppBookmarks' never fails thereafter
So whenever there is no saved data to NSUserDefaults and I saved a value, it's not loading or saving for first time. Any attempt to save and load is working after then.
Try this:
NSMutableArray *bookmarkedURLs = [[NSMutableArray alloc] init];
[bookmarkedURLs addObject:bookmark]; // 'bookmark' is a NSURL object
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:bookmarkedURLs forKey:#"AppBookmarks"];
[defaults synchronize];
I hope this can help you.
You can do something like,
NSUserDefaults *myDefaults = [NSUserDefaults standardUserDefaults];
// for example
NSURL *url1; // your url1
NSURL *url2; // your url2
//Set data to userdefaults
NSMutableArray *arr = [[NSMutableArray alloc]initWithObjects:url1,url2, nil]; // Store urls directly in array
NSData *bookMarkdata = [NSKeyedArchiver archivedDataWithRootObject:arr]; // convert whole array in data
[myDefaults setObject:bookMarkdata forKey:#"AppBookmarks"]; // save that data object to userdefaults
[myDefaults synchronize];
//Retreive data from userdefaults
NSData *resultData = [myDefaults objectForKey:#"AppBookmarks"]; //retrieve data from user defaults
NSMutableArray *resultArr = [NSKeyedUnarchiver unarchiveObjectWithData:resultData]; // get result array from data
[PlaySound stop];
[PlaySound prepareToPlay];
[[NSUserDefaults standardUserDefaults] synchronize];
text = [[NSUserDefaults standardUserDefaults] stringForKey:#"defaulttext"];
NSLog(#"%#",text);
BOOL loop = [prefs boolForKey:#"switch"];
NSLog(#" %d",loop);
do {
[PlaySound play];
} while (loop ==YES);
There are two major problems I am facing with this code.
1) This is a function which is called when a button is tapped... I am allocating the audio player in this function. Whenever this function is called I called the stop function on audio player yet it does not stop and two sounds play simultaneously.
2) My defaults are not registering correctly. Both the string and bool are showing nil in console.
I haves added settings bundle in my app.
Edit: Rest of the method
NSUInteger selectedRow= [SoundPicker selectedRowInComponent:0];
NSString *userchoice =[self pickerView:SoundPicker titleForRow:selectedRow forComponent:0];
NSString *soundpath = [[NSBundle mainBundle] pathForResource:userchoice ofType:#"wav"];
NSURL *fileURl = [[NSURL alloc] initFileURLWithPath:soundpath];
NSError **error = nil;
PlayFartSound = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURl error:error];
I have sorted the problem of audio player.
Can anyone please help on NSUserDefaults.
In my settings root plist I have a text field with identifier name name_preference so I put this in code:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
text = [defaults stringForKey:#"name_preference"];
NSLog(#"%# abc",text);
The log is (null) abc ? [I have set the default value to hello in plist]
How are you setting the default values in your NSUserDefaults? You say you've got the defaults in a plist, but when do you load that plist into NSUserDefaults?
To set the default NSUserDefaults values, you need to call this somewhere early in your program, ideally in somewhere like applicationDidFinishLaunching
[[NSUserDefaults standardUserDefaults] registerDefaults:defaults];
Where 'defaults' is a dictionary of default settings, possibly loaded from a plist.
Currently I'm trying to save an NSRect to my user defaults. Right now I'm using a NSValue to wrap it as an object then save it into the user defaults as an object with the following code
[userDefaults setObject:[NSValue valueWithRect:rect forKey:#"Key"]];
However, when I run it, I get an error that says [NSUserDefaults setObject:forKey:]: Attempt to insert non-property value 'NSRect: {{0, 0}, {50, 50}}' of class 'NSConcreteValue'.
Does anyone know how I can fix this? Thanks.
Here is a much simpler solution, using NSString:
// store:
[[NSUserDefaults standardUserDefaults]
setValue:NSStringFromCGRect(frame) forKey:#"frame"];
// retrieve:
CGRect frame = CGRectFromString(
[[NSUserDefaults standardUserDefaults] stringForKey:#"frame"]);
Swift 4
// store
UserDefaults.standard.set(NSStringFromCGRect(rect), forKey: "frame")
// retrieve
if let s = UserDefaults.standard.string(forKey: "frame") {
let frame = CGRectFromString(s)
}
NSValue is not supported by the user defaults.
The value parameter can be only property list objects: NSData,
NSString, NSNumber, NSDate, NSArray, or NSDictionary. For NSArray and
NSDictionary objects, their contents must be property list objects.
You need to archive the value into data then unarchive it when you access it.
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSRect rect = { 0, 0, 10, 20 };
NSValue *value = [NSValue valueWithRect:rect];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:value];
[userDefaults setObject:data forKey:#"key"];
[userDefaults synchronize];
data = [userDefaults objectForKey:#"key"];
NSValue *unarchived = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(#"%#", unarchived);
I have an application that involves lots of MKOverlayViews. Every time one is added to the map, it is also added to an NSArray. When the user wishes to stop adding overlays, I would like for them to be able to save them, and be able to access them later. How can I store an array of MKOverlayViews into a plist, and then reload them back into a mapView later? Is this possible?
I'm attempting to use this code to take the MKPolylineViews from the array and add the corresponding MKPolylines to the map, but it crashes at the '[mapView addOverlay....' line.
Writing array to plist:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if(overlays)
{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:overlays];
[defaults setObject:data forKey:#"theKey"];
[defaults synchronize];
}
Reading data from plist:
NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:#"theKey"];
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data];
for(MKPolylineView* a in arr)
[mapView addOverlay:a.polyline];
I'd look at archiving with NSArchiver or NSKeyedArchiver and then writing them out to disk. Probably better than trying to squeeze them into a plist somehow...