Question

Why does the following result in a BAD_ACCESS error?

NSDictionary *header=[[NSDictionary alloc]initWithObjectsAndKeys:@"fred",@"title",1,@"count", nil];

Can you have different types of objects as values in NSDictionary, including another NSDictionary?

Answer 1

You can put any type of object into an NSDictionary. So while @"fred" is OK, 1 is not, as an integer is not an object. If you want to put a number in a dictionary, wrap it in an NSNumber:

NSDictionary *header = { @"title": @"fred", @"count": @1 };