简单的作业对我不起作用：iPhone SDK

Question

Can someone please explain to me why this simple assignment doesn't work.
Here is the code
loanDetails.currency = myCurrency;
NSLog(@" Value %@",myCurrency);
NSLog(@" Value %@",loanDetails.currency);
NSLog(@" Value %@",myCurrency);


the output is:-
2010-05-05 23:00:44.394 ExpenseTracker[3576:207] Value AFA
2010-05-05 23:00:44.750 ExpenseTracker[3576:207] Value (null)
2010-05-05 23:00:45.095 ExpenseTracker[3576:207] Value AFA


And the definition is as:

@property (nonatomic,retain) NSString *currency;


Answer 1

loadDetails为零吗？

Answer 2

Well, when you write loanDetails.currency = myCurrency , that's the equivalent of calling [loanDetails setCurrency:myCurrency] . So, take a look at your header: did you define it readonly by accident? Have you synthesized accessor methods or did you write your own?