[SR-4428] Error on accessing property on a object that was passed as a parameter in perform(_ aSelector: Selector!, with object: Any!) #47005
Description
| Previous ID | SR-4428 |
| Radar | None |
| Original Reporter | alambov (JIRA User) |
| Type | Bug |
| Status | Resolved |
| Resolution | Done |
Attachment: Download
Environment
Apple Swift version 3.1 (swiftlang-802.0.48 clang-802.0.38)
Xcode
Version 8.3 (8E162)
Additional Detail from JIRA
| Votes | 0 |
| Component/s | Compiler |
| Labels | Bug, Runtime |
| Assignee | None |
| Priority | Medium |
md5: 9710840c1fa39ed7c7b70a916dff87f8
Issue Description:
Error occurs when an object that implements "Error" protocol is passed as "with" parameter in perform(_ aSelector: Selector) method.
After that trying to access its "localizedDescription" property raises "object 0x608000012890 of class '__lldb_expr_56.PLError' does not implement methodSignatureForSelector"
Here is the test code:
import UIKit
struct PLError: Error {
}
class PLSender {
init(withReceiver receiver: PLReceiver) {
let error = PLError()
print("Calling method direct:")
receiver.testError(error: error)
print("Calling method via perform selector:")
receiver.perform(#selector(PLReceiver.testError(error:)), with: error)
}
}
class PLReceiver: NSObject {
func testError(error: Error) {
print("Localized string is:", error.localizedDescription)
}
}
let receiver = PLReceiver()
let sender = PLSender(withReceiver: receiver)Here is console info:
Calling method direct:
Localized string is: The operation couldn’t be completed. (__lldb_expr_74.PLError error 1.)
Calling method via perform selector:
2017-03-30 11:46:18.401 Test Error[1321:310854] -[_SwiftValue domain]: unrecognized selector sent to instance 0x610000028380
2017-03-30 11:46:18.403 Test Error[1321:310854] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_SwiftValue domain]: unrecognized selector sent to instance 0x610000028380'
*** First throw call stack:
(
0 CoreFoundation 0x0000000102151b0b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x0000000101bb6141 objc_exception_throw + 48
2 CoreFoundation 0x00000001021c1134 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00000001020d8840 ___forwarding___ + 1024
4 CoreFoundation 0x00000001020d83b8 _CF_forwarding_prep_0 + 120
5 CoreFoundation 0x0000000102100568 CFErrorGetDomain + 40
6 libswiftFoundation.dylib 0x0000000110f1aa7e _TTWCSo7CFErrors5Error10FoundationFS0_g7_domainSS + 30
7 libswiftCore.dylib 0x00000001108ff2ee swift_stdlib_getErrorDomainNSString + 78
8 libswiftCore.dylib 0x0000000110adb68c _ZL28_swift_bridgeErrorToNSError_PN5swift10SwiftErrorE + 284
9 libswiftFoundation.dylib 0x0000000110f19798 _TFE10FoundationPs5Errorg20localizedDescriptionSS + 184
10 ??? 0x00000001110f0c63 0x0 + 4581166179
11 ??? 0x00000001110f0d88 0x0 + 4581166472
12 ??? 0x00000001110f089b 0x0 + 4581165211
13 ??? 0x00000001110f09d0 0x0 + 4581165520
14 ??? 0x00000001110f01cf 0x0 + 4581163471
15 Test Error 0x00000001015e5610 main + 0
16 CoreFoundation 0x00000001020f7b5c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
17 CoreFoundation 0x00000001020dce54 __CFRunLoopDoBlocks + 356
18 CoreFoundation 0x00000001020dc5ee __CFRunLoopRun + 894
19 CoreFoundation 0x00000001020dc016 CFRunLoopRunSpecific + 406
20 GraphicsServices 0x000000010750aa24 GSEventRunModal + 62
21 UIKit 0x0000000102c5e0d4 UIApplicationMain + 159
22 Test Error 0x00000001015e56d9 main + 201
23 libdyld.dylib 0x000000010569865d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSExceptionPlease find attached Swift playground that demonstrates this issue.