Apple Watch, WatchKit, and NSUserDefaults [duplicate] - ios

Question

This question already has answers here:
WatchKit SDK not retrieving data from NSUserDefaults
(2 answers)
Closed 8 years ago.
I figured since the "Watch App" is a bundle in the same iOS application, I should be able to access NSUserDefaults within my Apple Watch App. Is this not so?
I can't seem to get NSUserDefaults values from my iOS (which I made sure has data as it loads fine in the iOS app).
When I run it in the Apple Watch app, it comes in as empty. Do I not have access to the same NSUserDefaults values as the iOS parent app?
I have a custom class which contains an NSMutalArray. This mutable array is what I want to display in a Table in the Watch App. This same class which contains the NSMutableArray also has functions to save/load data to/from NSUserDefaults. It works fine in my iOS app but just doesn't load data in the Apple Watch app.
What am I doing wrong here or what am I not aware of?
Here is the class:
Keep in mind that I use it as a singleton object too. It saves it's data into NSUserDefaults by first converting itself into NSData - which is why you see extra functions in this class that you can just ignore.
#import "Teacher.h"
#import "Course.h"
#implementation Teacher
static Teacher *sharedInstance = Nil;
+ (Teacher *)sharedInstance
{
#synchronized(self)
{
if(!sharedInstance)
{
sharedInstance = [[self alloc] init];
}
}
return sharedInstance;
}
- (id)init
{
self = [super init];
if (self)
{
_classes = [[NSMutableArray alloc] init];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)coder
{
[coder encodeObject:_classes forKey:#"classes"];
}
- (id)initWithCoder:(NSCoder *)coder
{
self = [super init];
if (self)
{
_classes = [coder decodeObjectForKey:#"classes"];
}
return self;
}
+ (void)saveData
{
NSMutableArray *teacherClasses = [[Teacher sharedInstance] classes];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:teacherClasses];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:data forKey:#"teacherClasses"];
}
+ (void)loadData
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *loadClasses= [NSKeyedUnarchiver unarchiveObjectWithData:[userDefaults objectForKey:#"teacherClasses"]];
if(loadClasses == Nil)
{
loadClasses = [[NSMutableArray alloc] init];
}
[[Teacher sharedInstance] setClasses:loadClasses];
}
- (Teacher *) copyWithZone:(NSZone *)zone
{
Teacher *teacher = [[Teacher alloc] init];
[teacher setClasses:[self classes]];
return teacher;
}
#end
Thanks.

Answer 1

You need to use a shared container if you wish to share data between your iOS app and your Apple Watch app.