how to store the integer value to the NSUserdefaults in objective c?

Question

int ramdomnumber = arc4random_uniform(900000) + 100000;
[[NSUserDefaults standardUserDefaults] setObject:ramdomnumber forKey:@"contactno"];
[[NSUserDefaults standardUserDefaults] synchronize];

i tried the above code but it showing the error like implicit conversion of 'int' to 'id_nullable' is disallowed with ARC.can anyone suggest me how to store the int value in the nsuserdefaults .

int ramdomnumber = arc4random_uniform(900000) + 100000; [[NSUserDefaults standardUserDefaults] setObject:@(ramdomnumber) forKey:@"contactno"]; [[NSUserDefaults standardUserDefaults] synchronize]; — Sargis, Apr 18 '17 at 10:45

score 4 · Answer 1 · answered Apr 18 '17 at 09:08

4

The error occurs because you are passing a scalar type to a method which expects an object.

There is a dedicated method, it's good programming habit to cast the value to the expected type;

NSInteger ramdomnumber = (NSInteger)(arc4random_uniform(900000) + 100000);
[[NSUserDefaults standardUserDefaults] setInteger:ramdomnumber forKey:@"contactno"];
// [[NSUserDefaults standardUserDefaults] synchronize];

synchronize is not needed.

answered Apr 18 '17 at 09:08

vadian

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thank u very much sir ,i got it – pavithra Apr 18 '17 at 09:12
[I think synchronize is needed...](http://stackoverflow.com/a/9647965/1066828) & better to be used for safe-side – Fahim Parkar Apr 18 '17 at 09:12
@FahimParkar Did you read also the answer quoting the documentation? It reveals it's only needed in a few rare cases. – vadian Apr 18 '17 at 09:14

score 2 · Answer 2 · answered Apr 18 '17 at 09:09

The problem here is that int is not an Object, what you should do is:

int ramdomnumber = arc4random_uniform(900000) + 100000;
[[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithInt:ramdomnumber] forKey:@"contactno"];
[[NSUserDefaults standardUserDefaults] synchronize];

score 2 · Accepted Answer · answered Apr 18 '17 at 09:12

u can use NSNumber to store the integer values for example,

int ramdomnumber = arc4random_uniform(900000) + 100000;
 NSNumber *randomNo = [NSNumber numberWithInt: ramdomnumber]; 
[[NSUserDefaults standardUserDefaults] setObject: randomNo forKey:@"contactno"]; //save NSNumber instance not the int 
[[NSUserDefaults standardUserDefaults] synchronize];

to get integer back, same way,

NSNumber *savedNo = [[NSUserDefaults standardUserDefaults] objectForKey:@"contactno"];
int ramdomnumber = savedNo.intValue;//[savedNo intValue];

how to store the integer value to the NSUserdefaults in objective c?

3 Answers3