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# 第9章 错误处理
enum ParseError: Error {
case wrongEncoding
case warning(line: Int, message: String)
}
do{
let result = try parse(text: "{ \"message\": \"We come in peace\" }")
print(result)
} catch ParseError.wrongEncoding {
print("Wrong encoding")
} catch let ParseError.warning(line, message) {
print("Warning at line \(line): \(message)")
} catch {
// 其他
}
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- CustomNSError: provides a domain, error code, and user-info dictionary
- LocalizedError: provides localized messages describing the error and why it occurred
- RecoverableError: presents several potential recovery options to the user