Well, I know the cause of the error, my question here is how to avoid this kind of error. In my case, what I want is, if the user enters a wrong id which means when the array return 0 results, is says for example : Well, I know the cause of the error, my questio
阅读背景：
NSRangeException'，原因:'*** -[__NSArrayI objectAtIndex:]:索引0超出了空数组的界限。
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