我在我的iPhone应用程序中使用NSURLRequest类，并且调用它的方法返回一个NSString，这对于连接正常通过时非常好，但问题在于我需要将NSError转换为NSString，以便我可以将其返回或在其上运行一些if()语句。
有什么想法？
-[NSError localizedDescription] 的中文翻译为：-[NSError localizedDescription]。
此外，每个继承自NSObject的ObjC对象都实现了-description，它返回一个NSString。
对于刚接触Objective-C（像我一样）的人，以下是示例代码，可使KennyTM的接受答案工作 ->
[self showAlertWithTitle:@"Error:" withMessage:error.localizedDescription];
你可以尝试使用localizedDescription方法，它会返回一个字符串。
更多内容请查看文档。
我发现有三种主要方法可以使用NSError：
获取所有错误细节：
NSError * err;
...
[NSString stringWithFormat:@"%@", err];
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