在 Swift 中捕获 Objective-C 异常
许多 Cocoa API 可能会抛出 Swift 无法捕获的异常 (NSKeyedUnarchiver
、NSTask
、NSObject#value(forKey:)
等)。这个包封装了一个 Objective-C 异常处理程序,使其可以捕获此类异常。
捕获异常的功能实际上应该内置到 Swift 中。如果您同意,请复制 这个 Feedback Assistant 报告。
将以下内容添加到 Package.swift
.package(url: "https://github.com/sindresorhus/ExceptionCatcher", from: "2.0.0")
import Foundation
import ExceptionCatcher
final class Foo: NSObject {}
do {
let value = try ExceptionCatcher.catch {
return Foo().value(forKey: "nope")
}
print("Value:", value)
} catch {
print("Error:", error.localizedDescription)
//=> Error: [valueForUndefinedKey:]: this class is not key value coding-compliant for the key nope.
debugPrint(error)
/*
Error Domain=NSUnknownKeyException Code=0 "[valueForUndefinedKey:]: this class is not key value coding-compliant for the key nope." UserInfo={CallStackSymbols=(
0 CoreFoundation 0x00007fff361798ab __exceptionPreprocess + 250
1 libobjc.A.dylib 0x00007fff6c3ea805 objc_exception_throw + 48
2 CoreFoundation 0x00007fff361a230c -[NSException raise] + 9
3 Foundation 0x00007fff388f86c4 -[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 222
4 Foundation 0x00007fff3876f8fd -[NSObject(NSKeyValueCoding) valueForKey:] + 317
5 ExceptionCatcherTests 0x0000000103402ef6 $s21ExceptionCatcherTestsAAC9testCatchyyKFypSgyXEfU1_ + 118
…
*/
}