ios 不处理从这里抛出的错误
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Errors thrown from here are not handled
提问by TibiaZ
I've got this problem trying to parse a JSON on my iOS app:
我在尝试在我的 iOS 应用程序上解析 JSON 时遇到了这个问题：
Relevant code:
相关代码：
let jsonData:NSDictionary = try JSONSerialization.jsonObject(with: urlData! as Data, options: JSONSerialization.ReadingOptions.mutableContainers ) as! NSDictionary
/* XCode error ^^^ Errors thrown from here are not handled */
Could anybody help me ?
有人可以帮我吗？
回答by shallowThought
A possibly thrown error in let jsonData = try JSONSerialization ...is not handled.
let jsonData = try JSONSerialization ...不处理可能抛出的错误。
You can ignore a possible error, and crash as penalty if an error occurs:
您可以忽略可能的错误，如果发生错误，则崩溃作为惩罚：
let jsonData = try! JSONSerialization ...
or return an Optional, so jsonDatais nilin error case:
或返回一个Optional，所以jsonData是nil在错误情况下：
let jsonData = try? JSONSerialization ...
or you can catch and handle the thrown error:
或者您可以捕获并处理抛出的错误：
do {
let jsonData = try JSONSerialization ...
//all fine with jsonData here
} catch {
//handle error
print(error)
}
You might want to study The Swift Language
你可能想学习The Swift Language
