Question

I have noticed that the saving of NSUserDefaults takes a while.

How can I check if it has finished saving?

for example I do:

NSMutableArray *uld = [NSMutableArray arrayWithArray:[[NSUserDefaults standardUserDefaults] arrayForKey:@"testdata"]];
[uld addObject:teststring];
[[NSUserDefaults standardUserDefaults] setObject:uld forKey:@"testdata"];

Answer 1

You normally don’t have to worry about NSUserDefaults it will store changes whenever there is time, if you need to make sure a changes has been written to disk call - (BOOL) synchronise, it will return YES if the defaults were correctly written to disc.

See the NSUserDefaults reference page at Apple