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StackOverflow2013
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POHaving a trouble dealing with the object returned from NSUserDefaults
 

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  1. POHaving a trouble dealing with the object returned from NSUserDefaults
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    <p>I'm new to ios programming and just started learning this last month.</p> <p>There is one problem that I've been in stuck with for the last two days. I can't figure out how to fix this problem by myself.</p> <p>So, I'd like to ask you a favor to help me solve this problem!</p> <p>This is the error that I'm getting.</p> <pre><code>[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object' </code></pre> <p>I learned that I get this error because the object I get from NSUserDefaults is always immutable.</p> <p>So, I mutableCopy the array that I want to add new object to.</p> <pre><code> NSMutableArray *temporaryArray = [users[1][@"users"] mutableCopy]; [temporaryArray addObject:myData]; users[1][@"users"] = temporaryArray; </code></pre> <p>But, on the third line above, of course, it causes the same error.</p> <p>I know the reason why it causes this error but I don't know how to code to solve this problem. I think the solution is something very simple and basic, but I can't figure it out how.</p> <p>I appreciate if anyone helps me to solve this problem!!</p> <p>Thank you very much in advance!</p> <pre><code>- (void)saveData { NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; NSMutableArray *users = [userDefaults objectForKey:@"users"]; NSDictionary *myData = @{@"name":@"test", @"birthdate":@"1981-01-01", @"sex":@"male"}; NSMutableArray *temporaryArray = [users[1][@"users"] mutableCopy]; [temporaryArray addObject:myData]; users[1][@"users"] = temporaryArray; [userDefaults setObject:users forKey:@"users"]; [userDefaults synchronize]; [self.target performSelector:self.action withObject:@"test.png"]; [self dismissViewControllerAnimated:YES completion:nil]; } </code></pre> <p><strong>The structure of "user" Array.</strong></p> <pre><code>( { label = "\U81ea\U5206"; users = ( { birthdate = "2013-10-12"; name = Test; sex = "\U7537\U6027"; } ); }, { label = "Family(\U5bb6\U65cf)"; users = ( ); }, { label = "Friends(\U53cb\U9054)"; users = ( ); } ) </code></pre>
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    1. UScrzyonez777
    1. UScrzyonez777
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      1. POHaving a trouble dealing with the object returned from NSUserDefaults
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      1. VTUpMod
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