ios - @throw NSException 与 NSException 引发

Question

@throw NSException 和 NSException raise 有什么区别？我想知道我应该使用哪一个(有一个合适的用例来使用一个)，为什么？

Answer 1

来自 Apple 文档，

An important difference between @throw and raise is that the latter can be sent only to an NSException object whereas @throw can take other types of objects as its argument (such as string objects). Cocoa applications should @throw only NSException objects.

Typically you throw or raise an exception inside an exception-handling domain, which is a block of code marked off by the @try compiler directive.

See “Handling Exceptions” for details.

Within exception handling domains you can re-propagate exceptions caught by local exception handlers to higher-level handlers either by sending the NSException object another raise message or by using it with another @throw directive.

更多详情可以引用documentation .