UIDocument couldn't close again?

Question

When a UIDocument is closed, can it close again? Even when it's documentState is UIDocumentStateNormal after reopened?

Please help me. Thanks a lot!

[document openWithCompletionHandler:^(BOOL success) {
    if (success) {

        [document closeWithCompletionHandler:^(BOOL success) {
            if (success) {

                [document openWithCompletionHandler:^(BOOL success) {
                    if (success) {

                        NSLog(@"%d", document.documentState);

                        //Exception
                        [document closeWithCompletionHandler:^(BOOL success) {
                            if (success) {
                            } 
                        }];
                    } 
                }];
            } 
        }];
    } 
}];

When closeWithCompletionHandler called at the "Exception" mark, an exception is thrown:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
reason: 'closeWithCompletionHandler called while document is already closing'

Answer 1

Notice that you are still inside the first closeWithCompletionHandler method when you call the second. By reading the exception that seems to be the cause.