简单的任务不适合我：iphone sdk

Question

有人可以向我解释为什么这个简单的任务不起作用 这是代码
loanDetails.currency = myCurrency;
NSLog(@" Value %@",myCurrency);
NSLog(@" Value %@",loanDetails.currency);
NSLog(@" Value %@",myCurrency);


输出为： -
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


定义如下：

@property (nonatomic,retain) NSString *currency;


Answer 1

loadDetails是否为空？

Answer 2

好吧，当你写loanDetails.currency = myCurrency时，这相当于调用[loanDetails setCurrency:myCurrency]。那么，看一下你的标题：你是不是偶然定义了它readonly？你有合成访问器方法还是自己编写？