NSMutableArray 存放BOOL

注意BOOL是不能直接存放在NSMutableArray中的

NSNumber* yesObj = [NSNumber numberWithBool:YES];
NSMutableArray* arr = [[NSMutableArray alloc] initWithObjects:
                                               yesObj, yesObj, yesObj, yesObj, nil];
NSLog(@"%d", [[arr objectAtIndex:] boolValue]);