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README
ExceptionCatcher
Catch Objective-C exceptions in Swift
There are many Cocoa APIs that can throw exceptions that cannot be caught in Swift (NSKeyedUnarchiver, NSTask, NSObject#value(forKey:), etc). This package wraps an Objective-C exception handler to make it possible to catch such exceptions.
The ability to catch exceptions should really be built into Swift. If you agree, duplicate this Feedback Assistant report.
Install
Add the following to your Package.swift:
.package(url: "https://github.com/sindresorhus/ExceptionCatcher", from: "1.0.0")
Or add the package in Xcode.
Usage
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
…
*/
}
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