objective-c - 尝试为NSError设置本地化描述时代码崩溃

Question

如果出现问题，我正在尝试设置错误消息，但是我得到了

This class is not key value coding-compliant for the key NSLocalizedDescription

这是我使用的代码

-(id)getMoneyFromAccount:(int) sum error:(NSError **)error
{
    if(self.balance - sum < 0)
    {
        NSDictionary *details = [NSDictionary dictionary];
        [details setValue:@"You don't have enough money" forKey:NSLocalizedDescriptionKey];
        *error = [NSError errorWithDomain:@"money" code:200 userInfo:details];
        return nil;
    }
    self.balance = self.balance - sum;
    return  [NSNumber numberWithInt:self.balance];
}

Answer 1

您在应调用setValue:forKey:的位置调用setObject:forKey:

[details setObject:@"You don't have enough money" forKey:NSLocalizedDescriptionKey];

另外，您必须从 NSDictionary更改为 NSMutableDictionary或在初始化程序中设置值:

NSDictionary *details = [NSDictionary
    dictionaryWithObject:@"You don’t…"
    forKey:NSLocalizedDescriptionKey];

setValue:forKey:可以与可变字典配合使用，但是最好直接调用 setObject:forKey:。