Massimo Piazza Massimo Piazza - 4 months ago 7x
iOS Question

Save and Load Data on Today Extensions (iOS 8)

Is it possible to save and load data on Today Extension using NSUserDefaults?
After closing the Notification Center, the widget behaves like an app which is terminated, so any data results lost. How could I solve this issue?

This is my code:

NSUserDefaults *defaults;

- (void)viewDidLoad {

[super viewDidLoad];

defaults = [NSUserDefaults standardUserDefaults];
NSArray *loadStrings = [defaults stringArrayForKey:@"savedStrings"];

if ([loadStrings objectAtIndex:0] != nil) {
[display setText:[NSString stringWithFormat:@"%@", [loadStrings objectAtIndex:0]]];
if ([loadStrings objectAtIndex:1] != nil) {
calculatorMemory = [NSString stringWithFormat:@"%@", [loadStrings objectAtIndex:1]].doubleValue;


- (IBAction)saveData:(id)sender {

NSString *displayString;
NSString *memoryString;

NSArray *saveStrings = [[NSArray alloc] initWithObjects: displayString, memoryString, nil];

defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:saveStrings forKey:@"savedStrings"];
[defaults synchronize];



You need to use app group identifier instead of com.* For instance:

NSUserDefaults *shared = [[NSUserDefaults alloc]initWithSuiteName:@""];

Don't forget to synchronise when you store data

[shared synchronize];